Slim Node Si7021 sensor example
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@m26872 no problem, not your fault at all, mine for being a newbie. So much so that my first attempt resulted in me soldering the capacitor to the wrong hole, so I've had to abandon my first attempt. You live, you learn, next time I'll double check.
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@rsachoc Yes. Double check polarity of the 4.7uF cap.
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Hi all, again.
I have now successfully built (I think) the slim node, but without the 7021 temp sensor. Because this is the most expensive part of the device and because I find desoldering a challenge, but mainly because I'm waiting for it to arrive from China, can I try and upload the bootloader and sketch without the sensor attached?
If so, I had a couple questions from reading through this thread and the slim node thread. Firstly, uploading the bootloader, can this be done with the FTDI adaptor or do I need to follow the bit described in the slim node thread and attempt it using AVR studio? Secondly, once that is done, is it just a matter of uploading the sketch provided above?
Also, I wanted to confirm a few things on attaching the si7021 temp sensor. From what I can see, SOA (SDA) on the si7021 goes to A4 and SCL goes to A5. Also, GND goes to GND on the board (rightmost set on pins bottom right when FTDI is at the top) and VIN goes to VCC (just next to GND on the board)?
Thanks in advance.
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@rsachoc said:
can I try and upload the bootloader and sketch without the sensor attached?
Yes, you should be able to get far without the sensor. Send something over MySensors net and view debug prints. Or make some simple sensor like a reed switch.
uploading the bootloader, can this be done with the FTDI adaptor or do I need to follow the bit described in the slim node thread and attempt it using AVR studio?
Yes, Avr Studio or Uno as ISP.
Secondly, once that is done, is it just a matter of uploading the sketch provided above?
Yes, but if you don't connect a Si7021 I would go for some other simple test sketch to avoid any Si7021 library startup issues.
Also, I wanted to confirm a few things on attaching the si7021 temp sensor. From what I can see, SOA (SDA) on the si7021 goes to A4 and SCL goes to A5. Also, GND goes to GND on the board (rightmost set on pins bottom right when FTDI is at the top) and VIN goes to VCC (just next to GND on the board)?
Yes.
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Folks, a word of caution, for people that are attempting this for the first time, please burn the bootloader before you solder everything, as silly me, I built the entire thing (without the si7021) and now I'll need to bin it because the ATMega is soldered to the board and I've no way to load the bootloader soldered to the board!
Ah, the life of a newbie
I think what I'll do is once I've actually got a working board, I'll do a newbie writeup so that people don't make the same mistakes as me.
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First Attempt In Learning
A writeup would be awesome.
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@rsachoc Why don't you just solder some wires to pins you need ? The "in cicuit serial programming" concept would let you do it with almost anything attached.
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@m26872 said:
@rsachoc Why don't you just solder some wires to pins you need ? The "in cicuit serial programming" concept would let you do it with almost anything attached.
I might as well attempt that! I'm waiting for a breadboard, so I'll try and attempt it when that arrives.
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Some of my tips (noob alert) that I've gathered in my travels so far for this temp Slim node
- Burn the bootloader onto the ATMega328 first! (here is a guide for Arduino as ISP)
- Check the capacitor polarity before you solder it (the 4.7uF electrolytic capacitor, the others don't matter)
- I prefer using strips for the Atmega (see here) as you'll have more clearance for the capacitors which sit underneath (there is a caveat to this however, in that if you're not sure if you've got/burnt a bootloader onto the ATMega, using strips there is no going back, whereas with the chip socket, you can remove the ATMega). Update I think, for me anyway, if you're confident that the ATMega has been bootloaded successfully, I still prefer strips, however if you're unsure what you can do is use the socket and just sit it higher in it's position to get a decent clearance.
- The bill of materials (BOM) is here and also helps with figuring out which pieces go where
- Solder the capacitors, wires for Si7021 (with si7021 attached) and FTDI pins to the board first, then the strips + AtMega328p (see below), then the NRF last to the board. I found that the FTDI pins facing straight up were best for the box I was going to put it in
- Solder the strips to the ATMega first, then to the board
- Check the size of the box/fitting you are going to mount this in before you do all the above!
- Check that you are putting the ATMega chip the right way on the board, the notch should be facing the pins for the FTDI.
- Check continuity of the pins from the ATMega to the board pins underneath, I found the ATMega to strips were the most difficult to solder, and after I tested continuity I found a single pin which didn't have connection, so I added some more solder to this pin.
- Don't forget the resistor at R1 (I soldered this to the underside of the board, less by choice and more by the fact that I forgot about it, but I guess the preference would be the same side as the capacitors)
- I strongly advise buying the 3.3v ready si7021 temp sensor (here) as the modification to the 5v version is quite difficult for a newbie (the components are quite small) and you'll probably mess it up like I did.
General soldering tips
12) Practice soldering first, some of the joins are a little challenging and it took me a few attempts to get the hang of it
13) Get a decent size tip, my first was a bit large
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@rsachoc As a great man once said: "most bananas grow bent, and yet everyone loves them. There is nothing strange about the diversity of routes to success"
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Thanks all, I'm sure I will be adding to it, as I'm now trying to compile and upload the sketch. However, I'm getting the following error:
#error No forward link or gateway feature activated. This means nowhere to send messages! Pretty pointless. ^ exit status 1 Error compiling.I'm using the W5100 MQTT gateway sketch (which I believe is on the development branch), so I'm not sure if that's what's causing the error? I've tried deleting the Arduino IDE, the mysensors development branch from my PC, and reinstalling and redownloading the mysensors dev branch, but the same thing happens?
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OK, so it seems that it was because I was using the dev branch that I'm getting that error. I switched over to stable and the sketch compiles, although I do get a warning.
WARNING: Category '' in library UIPEthernet is not valid. Setting to 'Uncategorized'But I also can't upload the sketch above:
avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x18I noted above that something needed to be changed in terms of the baud rate, mine is set at 115200 in myconfig.h and I can't seem to find a reference in mysensor.h
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@rsachoc I sorry, but there seems to be an error in the sketch in the first post. Baud rate should be 9600 everywhere if you use the common Slim Node fuses and bootloader. Upload (board.txt), MyConfig.h (not MySensor.h since v1.5), Debug-prints and Arduino IDE serial monitor.
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Thanks, I've updated the sketch that I downloaded, also myconfig.h so that should be good. What do I need to select in the Arduino IDE for board type? I searched in the slim node thread and didn't see a reference to any changes?
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@rsachoc No changes. It is that boards.txt entry you should use.
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Hmmm ok, that's what I thought...still no luck, I've modified the boards.txt with the text from the slim node thread, and now it still has the same error message.
To confirm, my FTDI adaptor is attached to the board pins as follows:
FTDI <-> board
GND <-> first pin (i.e bottom left of board when looking at board laying long side horizontal and NRF radio on the other side)
CTS <-> board marked GND
PWR <-> board marked VCC
TXO <-> next up i.e. 4th pin
RXI <-> next up i.e. 5th pin
DTR <-> next up i.e. last pinOther than that, I guess it may be something wrong with the way I made the board? If so, what's the best way to troubleshoot? Could it be a bad bootloader flash? Is there a way to check if the ATMega has a bootloader?
edit in fact, it could be because I don't have the Si7021 connected? Could this be the reason a sketch is not uploading successfully?
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@rsachoc Start simple. Try on a board without nRF and sensors. Remove everything in the sketch and make it to just print "Hello world" back to serial monitor.
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Thanks, I haven't actually built a new node, but have been double checking everything on my current node. One thing I wanted to confirm, the 4.7uf capacitor, does the negative leg have to be on the corner of the board, as this is the way I have it currently? I think looking at the board layout in the main slim node thread, it should be the positive leg on the corner and the negative leg on the side of the board (the short side of the board)?
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@rsachoc I don't have it in front of me rigth now... but, there should be an arc and a super-small "+"-sign next to the positive pad. Maybe it just look like a dot.
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Ok so that may be the problem then! Let me solder it the right way and see if that helps otherwise I'm going to create a bare bones slim mode as suggested
edit to confirm the positive leg of the capacitor goes to the positive marked plus sign hole on the board?
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OK so I changed the polarity of the 4.7uf capacitor and I'm still receiving the same error. So I built a barebones one without sensor and without NRF. I am still getting the same error when uploading the sketch via the FTDI adaptor. I tried uploading a sketch to a Sensebender I have and it worked fine, so that rules out the FTDI adaptor.
Some pics in case someone can spot something obvious.
http://i.imgur.com/1SV0qO2.jpg
http://i.imgur.com/mUp87hB.jpg
http://i.imgur.com/oCqcDpo.jpg
So I can only think that it must be related to the ATMega bootloader? In the how to burn a bootloader thread, I received the following when trying to burn the bootloader, so I assumed it uploaded correctly?
C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\tools\avr/bin/avrdude -CC:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\tools\avr/etc/avrdude.conf -v -patmega328p -cstk500v1 -PCOM5 -b19200 -e -Ulock:w:0x3F:m -Uefuse:w:0x05:m -Uhfuse:w:0xDE:m -Ulfuse:w:0xFF:m avrdude: Version 6.0.1, compiled on Apr 15 2015 at 19:59:58 Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/ Copyright (c) 2007-2009 Joerg Wunsch System wide configuration file is "C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\tools\avr/etc/avrdude.conf" Using Port : COM5 Using Programmer : stk500v1 Overriding Baud Rate : 19200 AVR Part : ATmega328P Chip Erase delay : 9000 us PAGEL : PD7 BS2 : PC2 RESET disposition : dedicated RETRY pulse : SCK serial program mode : yes parallel program mode : yes Timeout : 200 StabDelay : 100 CmdexeDelay : 25 SyncLoops : 32 ByteDelay : 0 PollIndex : 3 PollValue : 0x53 Memory Detail : Block Poll Page Polled Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- --------- eeprom 65 20 4 0 no 1024 4 0 3600 3600 0xff 0xff flash 65 6 128 0 yes 32768 128 256 4500 4500 0xff 0xff lfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00 hfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00 efuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00 lock 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00 calibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00 signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00 Programmer Type : STK500 Description : Atmel STK500 Version 1.x firmware Hardware Version: 2 Firmware Version: 1.18 Topcard : Unknown Vtarget : 0.0 V Varef : 0.0 V Oscillator : Off SCK period : 0.1 us avrdude: AVR device initialized and ready to accept instructions Reading | ################################################## | 100% 0.02s avrdude: Device signature = 0x1e950f avrdude: erasing chip avrdude: reading input file "0x3F" avrdude: writing lock (1 bytes): Writing | ################################################## | 100% 0.01s avrdude: 1 bytes of lock written avrdude: verifying lock memory against 0x3F: avrdude: load data lock data from input file 0x3F: avrdude: input file 0x3F contains 1 bytes avrdude: reading on-chip lock data: C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\tools\avr/bin/avrdude -CC:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\tools\avr/etc/avrdude.conf -v -patmega328p -cstk500v1 -PCOM5 -b19200 -Uflash:w:C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex:i -Ulock:w:0x0F:m Reading | ################################################## | 100% 0.01s avrdude: verifying ... avrdude: 1 bytes of lock verified avrdude: reading input file "0x05" avrdude: writing efuse (1 bytes): Writing | ################################################## | 100% 0.01s avrdude: 1 bytes of efuse written avrdude: verifying efuse memory against 0x05: avrdude: load data efuse data from input file 0x05: avrdude: input file 0x05 contains 1 bytes avrdude: reading on-chip efuse data: Reading | ################################################## | 100% 0.01s avrdude: verifying ... avrdude: 1 bytes of efuse verified avrdude: reading input file "0xDE" avrdude: writing hfuse (1 bytes): Writing | ################################################## | 100% 0.01s avrdude: 1 bytes of hfuse written avrdude: verifying hfuse memory against 0xDE: avrdude: load data hfuse data from input file 0xDE: avrdude: input file 0xDE contains 1 bytes avrdude: reading on-chip hfuse data: Reading | ################################################## | 100% 0.01s avrdude: verifying ... avrdude: 1 bytes of hfuse verified avrdude: reading input file "0xFF" avrdude: writing lfuse (1 bytes): Writing | ################################################## | 100% 0.01s avrdude: 1 bytes of lfuse written avrdude: verifying lfuse memory against 0xFF: avrdude: load data lfuse data from input file 0xFF: avrdude: input file 0xFF contains 1 bytes avrdude: reading on-chip lfuse data: Reading | ################################################## | 100% 0.01s avrdude: verifying ... avrdude: 1 bytes of lfuse verified avrdude done. Thank you. avrdude: Version 6.0.1, compiled on Apr 15 2015 at 19:59:58 Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/ Copyright (c) 2007-2009 Joerg Wunsch System wide configuration file is "C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\tools\avr/etc/avrdude.conf" Using Port : COM5 Using Programmer : stk500v1 Overriding Baud Rate : 19200 AVR Part : ATmega328P Chip Erase delay : 9000 us PAGEL : PD7 BS2 : PC2 RESET disposition : dedicated RETRY pulse : SCK serial program mode : yes parallel program mode : yes Timeout : 200 StabDelay : 100 CmdexeDelay : 25 SyncLoops : 32 ByteDelay : 0 PollIndex : 3 PollValue : 0x53 Memory Detail : Block Poll Page Polled Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- --------- eeprom 65 20 4 0 no 1024 4 0 3600 3600 0xff 0xff flash 65 6 128 0 yes 32768 128 256 4500 4500 0xff 0xff lfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00 hfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00 efuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00 lock 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00 calibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00 signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00 Programmer Type : STK500 Description : Atmel STK500 Version 1.x firmware Hardware Version: 2 Firmware Version: 1.18 Topcard : Unknown Vtarget : 0.0 V Varef : 0.0 V Oscillator : Off SCK period : 0.1 us avrdude: AVR device initialized and ready to accept instructions Reading | ################################################## | 100% 0.02s avrdude: Device signature = 0x1e950f avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed To disable this feature, specify the -D option. avrdude: erasing chip avrdude: reading input file "C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex" avrdude: writing flash (32768 bytes): Writing | ################################################## | 100% 0.00s avrdude: 32768 bytes of flash written avrdude: verifying flash memory against C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex: avrdude: load data flash data from input file C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex: avrdude: input file C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex contains 32768 bytes avrdude: reading on-chip flash data: Reading | ################################################## | 100% -0.00s avrdude: verifying ... avrdude: 32768 bytes of flash verified avrdude: reading input file "0x0F" avrdude: writing lock (1 bytes): Writing | ################################################## | 100% 0.02s avrdude: 1 bytes of lock written avrdude: verifying lock memory against 0x0F: avrdude: load data lock data from input file 0x0F: avrdude: input file 0x0F contains 1 bytes avrdude: reading on-chip lock data: Reading | ################################################## | 100% 0.01s avrdude: verifying ... avrdude: 1 bytes of lock verified avrdude done. Thank you.
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@rsachoc Looks like you're missing the R1 resistor?
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@m26872 well that is probably it! I didn't even realise I needed that, oops! Sorry
! Let me try and get one (I think I have some already) and get soldering
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It lives! Well the one node I created does at least! I'll troubleshoot it, but the problem was the R1 resistor, which I (noobishly) forgot about! But very pleased, and thanks to m26872 especially and everyone else who helped.
I've updated the lessons learn post too!
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I just received my non-3.3v Si7021, and have now updated the lessons learnt post, as this board is tiny and I managed to mess up the soldering completely. Ordered the 3.3 ready version now, another month wait...
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@carlierd said:
@ar91 Please find the code I used in 3 different nodes. The good thing with the playground lib is that there is error message if dialog with DHT22 failed.
/** * The MySensors Arduino library handles the wireless radio link and protocol * between your home built sensors/actuators and HA controller of choice. * The sensors forms a self healing radio network with optional repeaters. Each * repeater and gateway builds a routing tables in EEPROM which keeps track of the * network topology allowing messages to be routed to nodes. * * Created by Henrik Ekblad <henrik.ekblad@mysensors.org> * Copyright (C) 2013-2015 Sensnology AB * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors * * Documentation: http://www.mysensors.org * Support Forum: http://forum.mysensors.org * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * */ /**************************************************************************************/ /* Temperature, humidity and luminosity measurements. */ /* */ /* Version : 1.1.6 */ /* Date : 10/01/2016 */ /* Modified by : David Carlier */ /**************************************************************************************/ /* --------------- */ /* RST | | A5 */ /* RX | | A4 */ /* TX | ARDUINO | A3 */ /* RFM69 (DIO0) --------- D2 | UNO | A2 */ /* DHT22 --------- D3 | | A1 */ /* Power --------- D4 | ATMEGA 328p | A0 --------- Light dep. resistor */ /* +3v --------- VCC | | GND --------- GND */ /* GND --------- GND | 8MHz int. | REF */ /* OSC | | VCC --------- +3v */ /* OSC | | D13 --------- RFM69 (SCK) */ /* D5 | | D12 --------- RFM69 (MISO) */ /* D6 | | D11 --------- RFM69 (MOSI) */ /* D7 | | D10 --------- RFM69 (NSS) */ /* D8 | | D9 */ /* --------------- */ /* */ /* Power = Vcc for LDR. */ /* +3v = 2*AA */ /* */ /**************************************************************************************/ #include <SPI.h> #include <MySensor.h> #include <dht.h> #include <MyTransportRFM69.h> #include <MySigningAtsha204Soft.h> #define CHILD_ID_HUM 0 #define CHILD_ID_TEMP 1 #define CHILD_ID_LIGHT 2 #define CHILD_ID_VOLTAGE 3 #define LIGHT_SENSOR_ANALOG_PIN 0 #define HUMIDITY_SENSOR_DIGITAL_PIN 3 #define POWER_PIN 4 //unsigned long SLEEP_TIME = 850000; // Sleep time between reads (in milliseconds) (close to 15') unsigned long SLEEP_TIME = 275000; // Sleep time between reads (in milliseconds) (close to 5') //Construct MySensors library MySigningAtsha204Soft signer; MyHwATMega328 hw; MyTransportRFM69 transport; MySensor gw(transport, hw, signer); dht DHT; MyMessage msgHum(CHILD_ID_HUM, V_HUM); MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP); MyMessage msgLum(CHILD_ID_LIGHT, V_LEVEL); MyMessage msgVolt(CHILD_ID_VOLTAGE, V_VOLTAGE); /**************************************************************************************/ /* Initialization */ /**************************************************************************************/ void setup() { //Get time (for setup duration) #ifdef DEBUG unsigned long startTime = millis(); #endif //Start MySensors gw.begin(); //Send the Sketch Version Information to the Gateway gw.sendSketchInfo("GHAS sensor", "1.1.5"); //Register all sensors to gw (they will be created as child devices) gw.present(CHILD_ID_HUM, S_HUM); gw.present(CHILD_ID_TEMP, S_TEMP); gw.present(CHILD_ID_LIGHT, S_LIGHT_LEVEL); gw.present(CHILD_ID_VOLTAGE, S_MULTIMETER); //Delay for DHT22 delay(1500); //Print setup debug #ifdef DEBUG int duration = millis() - startTime; Serial.print("[Setup duration: "); Serial.print(duration, DEC); Serial.println(" ms]"); #endif } /**************************************************************************************/ /* Main loop */ /**************************************************************************************/ void loop() { //Get time (for a complete loop) #ifdef DEBUG unsigned long startTime = millis(); #endif //Power on powerOnPeripherals(); //Get DHT22 data int dht22Result = DHT.read22(HUMIDITY_SENSOR_DIGITAL_PIN); switch (dht22Result) { case DHTLIB_OK: //Serial.println("OK,\t"); break; case DHTLIB_ERROR_CHECKSUM: #ifdef DEBUG Serial.println("Checksum error,\t"); #endif break; case DHTLIB_ERROR_TIMEOUT: #ifdef DEBUG Serial.println("Time out error,\t"); #endif break; case DHTLIB_ERROR_CONNECT: #ifdef DEBUG Serial.println("Connect error,\t"); #endif break; case DHTLIB_ERROR_ACK_L: #ifdef DEBUG Serial.println("Ack Low error,\t"); #endif break; case DHTLIB_ERROR_ACK_H: #ifdef DEBUG Serial.println("Ack High error,\t"); #endif break; default: #ifdef DEBUG Serial.println("Unknown error,\t"); #endif break; } //Get temperature and humidity float temperature = 0; float humidity = 0; if (dht22Result == DHTLIB_OK) { temperature = DHT.temperature; humidity = DHT.humidity; } //Get power before luminosity to use real voltage float realVoltage = getVoltage() / 100.0; int batteryPcnt = realVoltage * 100 / 3.0; if (batteryPcnt > 100) {batteryPcnt = 100;} int lux = computeIlluminance(realVoltage); //Power off powerOffPeripherals(); //Send data to gateway gw.send(msgHum.set(humidity, 1)); gw.send(msgTemp.set(temperature, 1)); gw.send(msgLum.set(lux)); gw.send(msgVolt.set(realVoltage, 2)); gw.sendBatteryLevel(batteryPcnt); //Print debug #ifdef DEBUG Serial.print(temperature, 1); Serial.print(" degC"); Serial.print(" "); Serial.print(humidity, 1); Serial.print(" %"); Serial.print(" "); Serial.print(lux); Serial.print(" lx"); Serial.print(" "); Serial.print(realVoltage); Serial.print(" v"); int duration = millis() - startTime; Serial.print(" "); Serial.print("["); Serial.print(duration, DEC); Serial.println(" ms]"); Serial.flush(); #endif //Sleep gw.sleep(SLEEP_TIME); } /**************************************************************************************/ /* Allows to compute illuminance (in LUX) from LIGHT_SENSOR_ANALOG_PIN. */ /**************************************************************************************/ int computeIlluminance(float realVoltage) { //Get luminosity int luminosity = analogRead(LIGHT_SENSOR_ANALOG_PIN); //Calculating the voltage in the input of the ADC double voltage = realVoltage * ((double)luminosity / 1024.0); //Calculating the resistance of the photoresistor in the voltage divider double resistance = (10.0 * realVoltage) / voltage - 10.0; //Calculating the intensity of light in lux and return it int illuminance = 255.84 * pow(resistance, -10/9); return illuminance; } /**************************************************************************************/ /* Allows to get the real Vcc (return value * 100). */ /**************************************************************************************/ int getVoltage() { const long InternalReferenceVoltage = 1056L; ADMUX = (0<<REFS1) | (1<<REFS0) | (0<<ADLAR) | (1<<MUX3) | (1<<MUX2) | (1<<MUX1) | (0<<MUX0); delay(50); // Let mux settle a little to get a more stable A/D conversion //Start a conversion ADCSRA |= _BV( ADSC ); //Wait for it to complete while (((ADCSRA & (1<<ADSC)) != 0)); //Scale the value int result = (((InternalReferenceVoltage * 1023L) / ADC) + 5L) / 10L; return result; } /**************************************************************************************/ /* Allows to power ON peripherals. */ /**************************************************************************************/ void powerOnPeripherals() { //Power-up pinMode (POWER_PIN, OUTPUT); digitalWrite (POWER_PIN, HIGH); delay(1); } /**************************************************************************************/ /* Allows to power OFF peripherals. */ /**************************************************************************************/ void powerOffPeripherals() { //Power off digitalWrite (HUMIDITY_SENSOR_DIGITAL_PIN, LOW); digitalWrite (POWER_PIN, LOW); pinMode (HUMIDITY_SENSOR_DIGITAL_PIN, INPUT); pinMode (POWER_PIN, INPUT); }Hope it helps !
David.
So the DHT22 works at 1MHz with 2 AAs and your code you´ve posted? No physical differnces?
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So I think I've finally got everything up and running! This is what I'm getting at the serial monitor in the IDE:
Serial started Voltage: 3359 mV send: 132-132-0-0 s=255,c=3,t=15,pt=2,l=2,sg=0,st=ok:0 send: 132-132-0-0 s=255,c=0,t=17,pt=0,l=5,sg=0,st=ok:1.5.4 send: 132-132-0-0 s=255,c=3,t=6,pt=1,l=1,sg=0,st=ok:0 read: 0-0-132 s=255,c=3,t=15,pt=0,l=2,sg=0: sensor started, id=132, parent=0, distance=1 send: 132-132-0-0 s=255,c=3,t=11,pt=0,l=15,sg=0,st=ok:EgTmpHumBat5min send: 132-132-0-0 s=255,c=3,t=12,pt=0,l=10,sg=0,st=ok:1.0 151106 send: 132-132-0-0 s=0,c=0,t=6,pt=0,l=0,sg=0,st=ok: send: 132-132-0-0 s=1,c=0,t=7,pt=0,l=0,sg=0,st=ok: Node and 2 children presented.What I'm trying to figure out is where the temp and humidity reading are so I can get them into MQTT/OpenHab. Looking at the output, I can't see which one is the temp, humidity or battery level?
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@rsachoc Is that all you get? Please also set sleep_time to 15000 for debug, if you haven't already done it.
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@m26872 thanks, I've set that, no change even after more than 15seconds and debug set.
Could it be the way I've connected the si7021? I've got it as follows:
- A4 to SDA
- A5 to SCL
- GND to GND
- VCC to 3.3v
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Maybe I need to add that I'm running the 2.0 MQTT controller? Not sure if that makes a difference? GatewayW5100MQTTClient
Just had a look what's going on on the controller side, this is what I see
0;255;3;0;9;Starting gateway (RNNGA-, 2.0.0-beta) 0;255;3;0;9;Radio init successful. 0;255;3;0;9;Init complete, id=0, parent=0, distance=0 0;255;3;0;9;Attempting MQTT connection... 0;255;3;0;9;MQTT connected 0;255;3;0;9;read: 132-132-0 s=255,c=3,t=15,pt=2,l=2,sg=0:0 0;255;3;0;9;send: 0-0-132-132 s=255,c=3,t=15,pt=0,l=2,sg=0,st=ok: 0;255;3;0;9;read: 132-132-0 s=255,c=0,t=17,pt=0,l=5,sg=0:1.5.4 0;255;3;0;9;Sending message on topic: mygateway1-out/132/255/0/0/17 0;255;3;0;9;read: 132-132-0 s=255,c=3,t=6,pt=1,l=1,sg=0:0 0;255;3;0;9;Sending message on topic: mygateway1-out/132/255/3/0/6 0;255;3;0;9;read: 132-132-0 s=255,c=3,t=11,pt=0,l=15,sg=0:EgTmpHumBat5min 0;255;3;0;9;Sending message on topic: mygateway1-out/132/255/3/0/11 0;255;3;0;9;read: 132-132-0 s=255,c=3,t=12,pt=0,l=10,sg=0:1.0 151106 0;255;3;0;9;Sending message on topic: mygateway1-out/132/255/3/0/12 0;255;3;0;9;read: 132-132-0 s=0,c=0,t=6,pt=0,l=0,sg=0: 0;255;3;0;9;Sending message on topic: mygateway1-out/132/0/0/0/6 0;255;3;0;9;read: 132-132-0 s=1,c=0,t=7,pt=0,l=0,sg=0: 0;255;3;0;9;Sending message on topic: mygateway1-out/132/1/0/0/7
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@rsachoc
My initial guess would be that you get stuck at this line:si7021_env data = humiditySensor.getHumidityAndTemperature();Did you try your Si7021 on some plain arduino first? Just with some simple example code.
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@m26872 thanks, yes, I guessed that something might be wrong with the sensor, I checked continuity between the board and the sensor and all seemed fine.
To test on an Arduino, I've honestly very little clue how to do this. Could I utilise the breadboard and Arduino I used to flash the AtMega?
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@rsachoc The "very little clue" is a good reason to play around and learn some.
You should not use a 5V Uno directly to sensor without voltage regulator and logic level converter. The Si7021 spec is 1.9-3.6V.
If you don't have a Arduino Pro Mini 3.3V, I suppose your best option is the SlimNode you already got. Try it at least at 8MHz (use suitable fuse settings, bootloader and baud rate), of course external crystal if you have.
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The most SI7021 coming from ebay are with voltage regulator and level shifter. I searched for a raw version and there are only very few... If you are not sure, post a link or a foto.
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@rollercontainer Thanks! You're absolutely right. I feel rather stupid not thinking of this.
So @rsachoc, if you're have some GY-21 like boards still not yet modded like described in first post of this thread, then they should work excellent with your Uno.
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Thanks both, I have the "pre-modded" si7021, so it's the one that should operate at between the 1.9 and 3.3v. I the Arduino I used to burn the Atmega is a knockoff, so it has both 3.3v and 5v. Let me do some research and see if I can test the si7021 using it.
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Some pictures anyway!
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@rsachoc Great with pictures! It looks like you haven't enabled the pull-up resistors by filling the solder jumpers in the middle of the board? Like this: https://cdn.sparkfun.com/assets/3/f/6/5/a/52855764757b7f06478b4567.jpg
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@m26872 oh! I didn't realise I needed to do that, could that be the problem? Do I just need to fill with solder the bit just below where the DA and "-" is?
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@rsachoc It's probably it. And yes, it's rigth there. Make sure all of the three small pads interconnect.
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@m26872 thanks! No time tonight, but a job for testing tomorrow.
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You could also use the 328 pullups! I had an unwilling Chinese light sensor (MAX44099) that drew a lot of power either with the VCC on or off. Since it's battery powered that is undesireable.
I used
digitalWrite(SDA, LOW); digitalWrite(SCL, LOW);to tie the bus to ground. When the sensor wakes up, it writesHIGHto those pins and the bus is back online. Used a 500ms wait after this to let the sensors stabilise.That sensor is now on a 6µA sleep current and a average 128µA over 2 hours measured with a 2 minute sleep cycle.
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Tried it this evening, still no luck, let me see what I can get up to over the weekend.
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@DavidZH True, internal pull-ups (20k?) should probably be enough for the normal i2c use (short wires, low speed, etc). But I wonder if pull-ups are consuming any significant power during passive state like sleeping sensor. Of course it's a good solution in case there're issues preventing the bus from beeing silent. Or worse, pulled down continuously.
What was your current before the change?
I think 500ms awake is a lot.
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@rsachoc Crap. Maybe it's something else then.
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I switch them off with a LOW write before the sensor goes to sleep and you're absolutely right about the wait time being very long. In this case I didn't mind because the sensor is powered by a solar panel.
I can't really remember what the exact value but it was an order of magnitude... I also used the voltage divider way to measure voltage because the Moteino has a regulator on board, so that upped the sleep current a little (10M resistor to keep the current low).I went searching because the current went UP when I switched the power to the sensor off before sleep. Gammon.co.au is a very useful source, but I can't remember where I dug this hack up.
I will be making other battery sensors for inside with a HTU21d and I will post more on those in a 'My Project' mega gallery including measurements. (And dig around in the HTU datasheet for the start up time....)
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According to the datasheet the absolute maximum time to get ready is 80ms.
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Thanx! Saves me a trip!
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Ok, so I messed up my previous sensor trying to solder the bridge (don't ask...) I have now (I think) soldered it and reconnected it, am now getting the following:
Serial started Voltage: 3359 mV send: 132-132-0-0 s=255,c=3,t=15,pt=2,l=2,sg=0,st=fail:0 send: 132-132-0-0 s=255,c=0,t=17,pt=0,l=5,sg=0,st=fail:1.5.4 send: 132-132-0-0 s=255,c=3,t=6,pt=1,l=1,sg=0,st=fail:0 sensor started, id=132, parent=0, distance=1 send: 132-132-0-0 s=255,c=3,t=11,pt=0,l=15,sg=0,st=fail:EgTmpHumBat5min send: 132-132-0-0 s=255,c=3,t=12,pt=0,l=10,sg=0,st=fail:1.0 151106 send: 132-132-0-0 s=0,c=0,t=6,pt=0,l=0,sg=0,st=fail: find parent send: 132-132-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,st=bc: send: 132-132-0-0 s=1,c=0,t=7,pt=0,l=0,sg=0,st=fail: Node and 2 children presented.I'm going to try get everything on a breadboard, but now I see fails, what's that all about?
PS will upload some pics of the soldered bridge...
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@rsachoc google "mysensors st fail"
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I am currently trying to use that red 3.3v module too and it doesn't seem to work. I have the sketch from above running with the "normal" blue module where I remove the voltage converter so that it works at 3.3V without a problem.
Then I switched to the red one (with these small 3 solderpads connected) and the scl/sda lines switched (the order is different form the blue one) but the program gets stuck at the same position as above (without the st=fail's though). So I assume thatsi7021_env data = humiditySensor.getHumidityAndTemperature();fails. Does anyone have one of these sensors up and running? Any ideas where the error is? Otherwise I guess I have to stick with the blue ones.
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@LastSamurai
The red ones are HTU21D and need another library (they are different from the SI7021).
Use the Adafruit library for this module (look on their site for HTU21D).
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@GertSanders hmmm I think I'm using that same one as @LastSamurai so I suspect that's the issue? It's the one linked in the first post
I guess if that's the problem it should have been obvious to me, it even says HTU21D on mine! Silly me!
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@rsachoc
Either one of these libraries will work with the HTU21D modules.
Both modules do the same, but have different I2C adresses so you can actually use both at the same time (of you like to compare them), but you need different libraries to call each one.
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@GertSanders Thanks, I don't know why I didn't realize that
I will try that out tomorrow.
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@LastSamurai I'm having a go as well at updating the .ino file with the different library, but I'm not a coder so I'm "having a hack" - if you have any luck could you post your code?
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@rsachoc Yes, I actually just tried it out and its working.
Here is my code for now (just for testing):
I basically just switched libraries/* Sketch with Si7021 and battery monitoring. by m26872, 20151109 Changed by LastSamurai 15052016 */ #include <MySensor.h> #include <Wire.h> #include <SPI.h> #include <SparkFunHTU21D.h> #include <RunningAverage.h> //#define DEBUG #ifdef DEBUG #define DEBUG_SERIAL(x) Serial.begin(x) #define DEBUG_PRINT(x) Serial.print(x) #define DEBUG_PRINTLN(x) Serial.println(x) #else #define DEBUG_SERIAL(x) #define DEBUG_PRINT(x) #define DEBUG_PRINTLN(x) #endif #define NODE_ID 100 // <<<<<<<<<<<<<<<<<<<<<<<<<<< Enter Node_ID #define CHILD_ID_TEMP 0 #define CHILD_ID_HUM 1 // #define SLEEP_TIME 15000 // 15s for DEBUG #define SLEEP_TIME 300000 // 5 min #define FORCE_TRANSMIT_CYCLE 36 // 5min*12=1/hour, 5min*36=1/3hour #define BATTERY_REPORT_CYCLE 2016 // Once per 5min => 12*24*7 = 2016 (one report/week) #define VMIN 1900 #define VMAX 3300 #define HUMI_TRANSMIT_THRESHOLD 3.0 // THRESHOLD tells how much the value should have changed since last time it was transmitted. #define TEMP_TRANSMIT_THRESHOLD 0.5 #define AVERAGES 2 int batteryReportCounter = BATTERY_REPORT_CYCLE - 1; // to make it report the first time. int measureCount = 0; float lastTemperature = -100; int lastHumidity = -100; RunningAverage raHum(AVERAGES); HTU21D humiditySensor; MySensor gw; MyMessage msgTemp(CHILD_ID_TEMP,V_TEMP); // Initialize temperature message MyMessage msgHum(CHILD_ID_HUM,V_HUM); void setup() { DEBUG_SERIAL(9600); // <<<<<<<<<<<<<<<<<<<<<<<<<< Note BAUD_RATE in MySensors.h DEBUG_PRINTLN("Serial started"); DEBUG_PRINT("Voltage: "); DEBUG_PRINT(readVcc()); DEBUG_PRINTLN(" mV"); delay(500); DEBUG_PRINT("Internal temp: "); DEBUG_PRINT(GetInternalTemp()); // Probably not calibrated. Just to print something. DEBUG_PRINTLN(" *C"); delay(500); // Allow time for radio if power useed as reset gw.begin(NULL, NODE_ID); gw.sendSketchInfo("TempHumTest2", "1.0 17052016"); gw.present(CHILD_ID_TEMP, S_TEMP); // Present sensor to controller gw.present(CHILD_ID_HUM, S_HUM); DEBUG_PRINT("Node and "); DEBUG_PRINTLN("2 children presented."); raHum.clear(); humiditySensor.begin(); } void loop() { measureCount ++; batteryReportCounter ++; bool forceTransmit = false; if (measureCount > FORCE_TRANSMIT_CYCLE) { forceTransmit = true; } sendTempHumidityMeasurements(forceTransmit); /* // Read and print internal temp float temperature0 = static_cast<float>(static_cast<int>((GetInternalTemp()+0.5) * 10.)) / 10.; DEBUG_PRINT("Internal Temp: "); DEBUG_PRINT(temperature0); DEBUG_PRINTLN(" *C"); */ // Check battery if (batteryReportCounter >= BATTERY_REPORT_CYCLE) { long batteryVolt = readVcc(); DEBUG_PRINT("Battery voltage: "); DEBUG_PRINT(batteryVolt); DEBUG_PRINTLN(" mV"); uint8_t batteryPcnt = constrain(map(batteryVolt,VMIN,VMAX,0,100),0,255); DEBUG_PRINT("Battery percent: "); DEBUG_PRINT(batteryPcnt); DEBUG_PRINTLN(" %"); gw.sendBatteryLevel(batteryPcnt); batteryReportCounter = 0; } gw.sleep(SLEEP_TIME); } // function for reading Vcc by reading 1.1V reference against AVcc. Based from http://provideyourown.com/2012/secret-arduino-voltmeter-measure-battery-voltage/ // To calibrate reading replace 1125300L with scale_constant = internal1.1Ref * 1023 * 1000, where internal1.1Ref = 1.1 * Vcc1 (per voltmeter) / Vcc2 (per readVcc() function) long readVcc() { // set the reference to Vcc and the measurement to the internal 1.1V reference ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1); delay(2); // Wait for Vref to settle ADCSRA |= _BV(ADSC); // Start conversion while (bit_is_set(ADCSRA,ADSC)); // measuring uint8_t low = ADCL; // must read ADCL first - it then locks ADCH uint8_t high = ADCH; // unlocks both long result = (high<<8) | low; result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000 return result; // Vcc in millivolts } // function for reading internal temp. From http://playground.arduino.cc/Main/InternalTemperatureSensor double GetInternalTemp(void) { // (Both double and float are 4 byte in most arduino implementation) unsigned int wADC; double t; // The internal temperature has to be used with the internal reference of 1.1V. Channel 8 can not be selected with the analogRead function yet. ADMUX = (_BV(REFS1) | _BV(REFS0) | _BV(MUX3)); // Set the internal reference and mux. ADCSRA |= _BV(ADEN); // enable the ADC delay(20); // wait for voltages to become stable. ADCSRA |= _BV(ADSC); // Start the ADC while (bit_is_set(ADCSRA,ADSC)); // Detect end-of-conversion wADC = ADCW; // Reading register "ADCW" takes care of how to read ADCL and ADCH. t = (wADC - 88.0 ) / 1.0; // The default offset is 324.31. return (t); // The returned temperature in degrees Celcius. } /********************************************* * * Sends temperature and humidity from Si7021 sensor * Parameters * - force : Forces transmission of a value (even if it's the same as previous measurement) *********************************************/ void sendTempHumidityMeasurements(bool force) { bool tx = force; float temperature = humiditySensor.readTemperature(); DEBUG_PRINT("T: ");DEBUG_PRINTLN(temperature); float diffTemp = abs(lastTemperature - temperature); DEBUG_PRINT(F("TempDiff :"));DEBUG_PRINTLN(diffTemp); if (diffTemp > TEMP_TRANSMIT_THRESHOLD || tx) { gw.send(msgTemp.set(temperature,1)); lastTemperature = temperature; measureCount = 0; DEBUG_PRINTLN("T sent!"); } int humidity = humiditySensor.readHumidity(); DEBUG_PRINT("H: ");DEBUG_PRINTLN(humidity); raHum.addValue(humidity); humidity = raHum.getAverage(); // MA sample imply reasonable fast sample frequency float diffHum = abs(lastHumidity - humidity); DEBUG_PRINT(F("HumDiff :"));DEBUG_PRINTLN(diffHum); if (diffHum > HUMI_TRANSMIT_THRESHOLD || tx) { gw.send(msgHum.set(humidity)); lastHumidity = humidity; measureCount = 0; DEBUG_PRINTLN("H sent!"); } }
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@LastSamurai thanks, progress, I'm getting this now, which means it's working! Finally, a working node from a complete rookie like me!
Serial started Voltage: 3389 mV Internal temp: 266.00 *C send: 100-100-0-0 s=255,c=3,t=15,pt=2,l=2,sg=0,st=ok:0 send: 100-100-0-0 s=255,c=0,t=17,pt=0,l=5,sg=0,st=ok:1.5.4 send: 100-100-0-0 s=255,c=3,t=6,pt=1,l=1,sg=0,st=ok:0 read: 0-0-100 s=255,c=3,t=15,pt=0,l=2,sg=0: sensor started, id=100, parent=0, distance=1 send: 100-100-0-0 s=255,c=3,t=11,pt=0,l=12,sg=0,st=fail:TempHumTest2 send: 100-100-0-0 s=255,c=3,t=12,pt=0,l=12,sg=0,st=fail:1.0 17052016 send: 100-100-0-0 s=0,c=0,t=6,pt=0,l=0,sg=0,st=fail: send: 100-100-0-0 s=1,c=0,t=7,pt=0,l=0,sg=0,st=fail: Node and 2 children presented. T: 998.00 TempDiff :1098.00 send: 100-100-0-0 s=0,c=1,t=0,pt=7,l=5,sg=0,st=fail:998.0 T sent! H: 118 HumDiff :218.00 send: 100-100-0-0 s=1,c=1,t=1,pt=2,l=2,sg=0,st=ok:118 H sent! Battery voltage: 3359 mV Battery percent: 104 % send: 100-100-0-0 s=255,c=3,t=0,pt=1,l=1,sg=0,st=ok:104I think that the readings are not accurate though, not sure why, but I'll have a go at figuring our why anyway!
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@rsachoc
Congrats !!!
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@GertSanders Thx a lot for your help! I had no clue about the HTU21D lib.
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This post is deleted!
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so with the correct library there is no need to solder those 3 spots together!?
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@siod
The "spots" are there to connect the pullup resistors to the SDA and SCL lines. This is always needed, regardless of the library of the board onto which you connect the sensor board does not provide pullup resistors itself. On a minimal board like the one in this thread, this is not the case, so the pull up resistors are needed.
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ok, thanks for making it clear for me Gert!!
update:
finally found time to build my sensor and it seems to work fine, will do more testing but for now my results are:
7.5 uA when sleeping, 15,3 mA when working (every 15 minutes for about 2seconds, but I think my cheap multimeter gives bad readings on those spikes, I guess it´s only around 1 mA)
seems to be okay, isn´t it?
edit:
I have 2 reed switches attached. I recognized that I have +0,10 mA for each reed switch when activated. So when reed switches are both touching their counterpart I have a sleeping consumption of 0,20 mA. Why is that??
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Hello,
I'm trying to convert existing Si7021 sensor code from 1.5 to 2.0.0 library. I change the code and then I was getting an error which said:
Si7021_sensor_MySensors_2.0.0:158: error: 'si7021_env' has no member named 'humidityPercent' int humidity = data.humidityPercent; ^ exit status 1 'si7021_env' has no member named 'humidityPercent'Then I chech the Si7021 library, and how I saw there wasn't member 'humidityPercent', but there was a member 'humidityBasisPoints'.
So I change line from:
int humidity = data.humidityPercent;...to:
int humidity = data.humidityBasisPoints;Then code compiles and I upload it to Slim Node Si7021. I leave sensor and today I checked it log on Domoticz. I have this:
Temperature looks ok, but Humidity value jumping a lot, thats why I don't want to believe it is true.
Could someone, who has a 2.0.0 library and Si7021 sensor chech is it same situation? Becose I have only one Si7021 sensor.
Maybe someone could look also on the code and say if I convert it right?Converted code:
/* Sketch with Si7021 and battery monitoring. by m26872, 20151109 */ #define MY_DEBUG #define MY_RADIO_NRF24 #define MY_NODE_ID 5 // <<<<<<<<<<<<<<<<<<<<<<<<<<< Enter Node_ID #define MY_BAUD_RATE 115200 #include <MySensors.h> #include <Wire.h> #include <SI7021.h> #include <SPI.h> #include <RunningAverage.h> //#define DEBUG #ifdef DEBUG #define DEBUG_SERIAL(x) Serial.begin(x) #define DEBUG_PRINT(x) Serial.print(x) #define DEBUG_PRINTLN(x) Serial.println(x) #else #define DEBUG_SERIAL(x) #define DEBUG_PRINT(x) #define DEBUG_PRINTLN(x) #endif #define CHILD_ID_TEMP 0 #define CHILD_ID_HUM 1 // #define SLEEP_TIME 15000 // 15s for DEBUG #define SLEEP_TIME 300000 // 5 min #define FORCE_TRANSMIT_CYCLE 36 // 5min*12=1/hour, 5min*36=1/3hour #define BATTERY_REPORT_CYCLE 2880 // Once per 5min => 12*24*7 = 2016 (one report/week) #define VMIN 1900 #define VMAX 3300 #define HUMI_TRANSMIT_THRESHOLD 3.0 // THRESHOLD tells how much the value should have changed since last time it was transmitted. #define TEMP_TRANSMIT_THRESHOLD 0.5 #define AVERAGES 2 int batteryReportCounter = BATTERY_REPORT_CYCLE - 1; // to make it report the first time. int measureCount = 0; float lastTemperature = -100; int lastHumidity = -100; RunningAverage raHum(AVERAGES); SI7021 humiditySensor; MyMessage msgTemp(CHILD_ID_TEMP,V_TEMP); // Initialize temperature message MyMessage msgHum(CHILD_ID_HUM,V_HUM); void presentation() { sendSketchInfo("EgTmpHumBat5min", "1.0 151106"); present(CHILD_ID_TEMP, S_TEMP); // Present sensor to controller present(CHILD_ID_HUM, S_HUM); } void setup() { DEBUG_SERIAL(115200); // <<<<<<<<<<<<<<<<<<<<<<<<<< Note BAUD_RATE in MySensors.h DEBUG_PRINTLN("Serial started"); DEBUG_PRINT("Voltage: "); DEBUG_PRINT(readVcc()); DEBUG_PRINTLN(" mV"); /* delay(500); DEBUG_PRINT("Internal temp: "); DEBUG_PRINT(GetInternalTemp()); // Probably not calibrated. Just to print something. DEBUG_PRINTLN(" *C"); */ delay(500); // Allow time for radio if power useed as reset DEBUG_PRINT("Node and "); DEBUG_PRINTLN("2 children presented."); raHum.clear(); } void loop() { measureCount ++; batteryReportCounter ++; bool forceTransmit = false; if (measureCount > FORCE_TRANSMIT_CYCLE) { forceTransmit = true; } sendTempHumidityMeasurements(forceTransmit); /* // Read and print internal temp float temperature0 = static_cast<float>(static_cast<int>((GetInternalTemp()+0.5) * 10.)) / 10.; DEBUG_PRINT("Internal Temp: "); DEBUG_PRINT(temperature0); DEBUG_PRINTLN(" *C"); */ // Check battery if (batteryReportCounter >= BATTERY_REPORT_CYCLE) { long batteryVolt = readVcc(); DEBUG_PRINT("Battery voltage: "); DEBUG_PRINT(batteryVolt); DEBUG_PRINTLN(" mV"); uint8_t batteryPcnt = constrain(map(batteryVolt,VMIN,VMAX,0,100),0,255); DEBUG_PRINT("Battery percent: "); DEBUG_PRINT(batteryPcnt); DEBUG_PRINTLN(" %"); sendBatteryLevel(batteryPcnt); batteryReportCounter = 0; } sleep(SLEEP_TIME); } // function for reading Vcc by reading 1.1V reference against AVcc. Based from http://provideyourown.com/2012/secret-arduino-voltmeter-measure-battery-voltage/ // To calibrate reading replace 1125300L with scale_constant = internal1.1Ref * 1023 * 1000, where internal1.1Ref = 1.1 * Vcc1 (per voltmeter) / Vcc2 (per readVcc() function) long readVcc() { // set the reference to Vcc and the measurement to the internal 1.1V reference ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1); delay(2); // Wait for Vref to settle ADCSRA |= _BV(ADSC); // Start conversion while (bit_is_set(ADCSRA,ADSC)); // measuring uint8_t low = ADCL; // must read ADCL first - it then locks ADCH uint8_t high = ADCH; // unlocks both long result = (high<<8) | low; result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000 return result; // Vcc in millivolts } // function for reading internal temp. From http://playground.arduino.cc/Main/InternalTemperatureSensor double GetInternalTemp(void) { // (Both double and float are 4 byte in most arduino implementation) unsigned int wADC; double t; // The internal temperature has to be used with the internal reference of 1.1V. Channel 8 can not be selected with the analogRead function yet. ADMUX = (_BV(REFS1) | _BV(REFS0) | _BV(MUX3)); // Set the internal reference and mux. ADCSRA |= _BV(ADEN); // enable the ADC delay(20); // wait for voltages to become stable. ADCSRA |= _BV(ADSC); // Start the ADC while (bit_is_set(ADCSRA,ADSC)); // Detect end-of-conversion wADC = ADCW; // Reading register "ADCW" takes care of how to read ADCL and ADCH. t = (wADC - 88.0 ) / 1.0; // The default offset is 324.31. return (t); // The returned temperature in degrees Celcius. } /********************************************* * * Sends temperature and humidity from Si7021 sensor * Parameters * - force : Forces transmission of a value (even if it's the same as previous measurement) *********************************************/ void sendTempHumidityMeasurements(bool force) { bool tx = force; si7021_env data = humiditySensor.getHumidityAndTemperature(); float temperature = data.celsiusHundredths / 100.0; DEBUG_PRINT("T: ");DEBUG_PRINTLN(temperature); float diffTemp = abs(lastTemperature - temperature); DEBUG_PRINT(F("TempDiff :"));DEBUG_PRINTLN(diffTemp); if (diffTemp > TEMP_TRANSMIT_THRESHOLD || tx) { send(msgTemp.set(temperature,1)); lastTemperature = temperature; measureCount = 0; DEBUG_PRINTLN("T sent!"); } int humidity = data.humidityPercent; DEBUG_PRINT("H: ");DEBUG_PRINTLN(humidity); raHum.addValue(humidity); humidity = raHum.getAverage(); // MA sample imply reasonable fast sample frequency float diffHum = abs(lastHumidity - humidity); DEBUG_PRINT(F("HumDiff :"));DEBUG_PRINTLN(diffHum); if (diffHum > HUMI_TRANSMIT_THRESHOLD || tx) { send(msgHum.set(humidity)); lastHumidity = humidity; measureCount = 0; DEBUG_PRINTLN("H sent!"); } }Thank You!
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@jacikaas where did you get the si7021 library? Take a look at the sensebender sketch for a good reference.
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@AWI
I download Si7021 library from here: https://github.com/LowPowerLab/SI7021I was heard about Sensbender node, but never look deeper what is in it. I will look at it and try to understand whats in there. I just learning about all that stuff, so it will be good practice
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@jacikaas that's the way to go. The sensebender sketch contains some rather nice best practices for low power. You best replace the si library with the one in the MySensors examples on github.
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@AWI I try to replace library from this one https://github.com/LowPowerLab/SI7021 to this one https://github.com/mysensors/MySensorsArduinoExamples
to work it I need to return variable name from:
int humidity = data.humidityBasisPoints;to:
int humidity = data.humidityPercent;I think this library https://github.com/LowPowerLab/SI7021 was updated, so it is not suitable for this one code. Now I test it again and everything looks fine:
Temperature and humidity node unregister or stop working repeatedly for about 2 hours (2h25min, 2.20, 1.50...). But after that it start to send data again, for some time and then goes around again.
I will try to understand why it happening too.
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I am trying to build the code using the HTU21D sensors. This built fine under 1.4 and 1.5 but now under v2 of MySensors I am getting this error:
C:\Users\wergeld\Documents\Arduino\SlimNodeSi7021\SlimNodeSi7021.ino:4:24: fatal error: MySensor.h: No such file or directory #include <MySensor.h> ^ compilation terminated. exit status 1 Error compiling for board APM Optiboot internal 1MHz noBOD 9600baud.Okay, so I change my reference to:
#include <MySensors.h>And I get this lovely error:
In file included from C:\Users\wergeld\Documents\Arduino\SlimNodeSi7021\SlimNodeSi7021.ino:4:0: C:\Users\wergeld\Documents\Arduino\libraries\MySensors-master/MySensors.h:287:4: error: #error No forward link or gateway feature activated. This means nowhere to send messages! Pretty pointless. #error No forward link or gateway feature activated. This means nowhere to send messages! Pretty pointless. ^ exit status 1 Error compiling for board APM Optiboot internal 1MHz noBOD 9600baud.So, other than slamming my head against my desk how can I solve this?
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Well, I solved it by modifying the code to 2.0 spec. Good lord I need sleep.
Working on debugging temp outputs now to Ethernet Gateway running on my Uno. Or I will sleep...
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Okay, I now have a soldered node and serial gateway setup to my laptop for testing. It presents the sensor node! The name and available sensors is correct. Howevr, it never sends any message payload with temp/hum or battery values. I am using the HTU21D without soldering those 3 pads on it together. I need to get myself a 3.3v FTDI cable so I can serially debug I guess. But, still! Progress.
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After soldering the 3 pads on the HTU21D I am now reading data and it is being sent to my test serial gateway. Need to measure current usage but at least it is functional.
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Okay, seeing something odd. The force transmit does not appear to be working.
Here is my current sketch:#define MY_RADIO_NRF24 #include <MyConfig.h> #include <MySensors.h> /* Sketch with Si7021 and battery monitoring. by m26872, 20151109 */ //#include <MySensors.h> #include <Wire.h> #include <SparkFunHTU21D.h> #include <SPI.h> #include <RunningAverage.h> //#define DEBUG #ifdef DEBUG #define DEBUG_SERIAL(x) Serial.begin(x) #define DEBUG_PRINT(x) Serial.print(x) #define DEBUG_PRINTLN(x) Serial.println(x) #else #define DEBUG_SERIAL(x) #define DEBUG_PRINT(x) #define DEBUG_PRINTLN(x) #endif #define NODE_ID 132 // <<<<<<<<<<<<<<<<<<<<<<<<<<< Enter Node_ID #define CHILD_ID_TEMP 0 #define CHILD_ID_HUM 1 // #define SLEEP_TIME 15000 // 15s for DEBUG #define SLEEP_TIME 300000 // 5 min #define FORCE_TRANSMIT_CYCLE 36 // 5min*12=1/hour, 5min*36=1/3hour #define BATTERY_REPORT_CYCLE 2880 // Once per 5min => 12*24*7 = 2016 (one report/week) #define VMIN 1900 #define VMAX 3300 #define HUMI_TRANSMIT_THRESHOLD 3.0 // THRESHOLD tells how much the value should have changed since last time it was transmitted. #define TEMP_TRANSMIT_THRESHOLD 0.5 #define AVERAGES 2 int batteryReportCounter = BATTERY_REPORT_CYCLE - 1; // to make it report the first time. int measureCount = 0; float lastTemperature = -100; int lastHumidity = -100; RunningAverage raHum(AVERAGES); HTU21D humiditySensor; //MySensor gw; MyMessage msgTemp(CHILD_ID_TEMP,V_TEMP); // Initialize temperature message MyMessage msgHum(CHILD_ID_HUM,V_HUM); void presentation() { sendSketchInfo("HTU21D", "1.0"); present(CHILD_ID_TEMP, S_TEMP); // Present sensor to controller present(CHILD_ID_HUM, S_HUM); } void setup() { DEBUG_SERIAL(9600); // <<<<<<<<<<<<<<<<<<<<<<<<<< Note BAUD_RATE in MySensors.h DEBUG_PRINTLN("Serial started"); DEBUG_PRINT("Voltage: "); DEBUG_PRINT(readVcc()); DEBUG_PRINTLN(" mV"); /* delay(500); DEBUG_PRINT("Internal temp: "); DEBUG_PRINT(GetInternalTemp()); // Probably not calibrated. Just to print something. DEBUG_PRINTLN(" *C"); */ delay(500); // Allow time for radio if power useed as reset //gw.begin(NULL,NODE_ID); //sendSketchInfo("HTU21D", "1.0"); //present(CHILD_ID_TEMP, S_TEMP); // Present sensor to controller //present(CHILD_ID_HUM, S_HUM); DEBUG_PRINT("Node and "); DEBUG_PRINTLN("2 children presented."); raHum.clear(); } void loop() { measureCount ++; batteryReportCounter ++; bool forceTransmit = false; if (measureCount > FORCE_TRANSMIT_CYCLE) { forceTransmit = true; } sendTempHumidityMeasurements(forceTransmit); /* // Read and print internal temp float temperature0 = static_cast<float>(static_cast<int>((GetInternalTemp()+0.5) * 10.)) / 10.; DEBUG_PRINT("Internal Temp: "); DEBUG_PRINT(temperature0); DEBUG_PRINTLN(" *C"); */ // Check battery if (batteryReportCounter >= BATTERY_REPORT_CYCLE) { long batteryVolt = readVcc(); DEBUG_PRINT("Battery voltage: "); DEBUG_PRINT(batteryVolt); DEBUG_PRINTLN(" mV"); uint8_t batteryPcnt = constrain(map(batteryVolt,VMIN,VMAX,0,100),0,255); DEBUG_PRINT("Battery percent: "); DEBUG_PRINT(batteryPcnt); DEBUG_PRINTLN(" %"); sendBatteryLevel(batteryPcnt); batteryReportCounter = 0; } sleep(SLEEP_TIME); } // function for reading Vcc by reading 1.1V reference against AVcc. Based from http://provideyourown.com/2012/secret-arduino-voltmeter-measure-battery-voltage/ // To calibrate reading replace 1125300L with scale_constant = internal1.1Ref * 1023 * 1000, where internal1.1Ref = 1.1 * Vcc1 (per voltmeter) / Vcc2 (per readVcc() function) long readVcc() { // set the reference to Vcc and the measurement to the internal 1.1V reference ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1); delay(2); // Wait for Vref to settle ADCSRA |= _BV(ADSC); // Start conversion while (bit_is_set(ADCSRA,ADSC)); // measuring uint8_t low = ADCL; // must read ADCL first - it then locks ADCH uint8_t high = ADCH; // unlocks both long result = (high<<8) | low; result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000 return result; // Vcc in millivolts } // function for reading internal temp. From http://playground.arduino.cc/Main/InternalTemperatureSensor double GetInternalTemp(void) { // (Both double and float are 4 byte in most arduino implementation) unsigned int wADC; double t; // The internal temperature has to be used with the internal reference of 1.1V. Channel 8 can not be selected with the analogRead function yet. ADMUX = (_BV(REFS1) | _BV(REFS0) | _BV(MUX3)); // Set the internal reference and mux. ADCSRA |= _BV(ADEN); // enable the ADC delay(20); // wait for voltages to become stable. ADCSRA |= _BV(ADSC); // Start the ADC while (bit_is_set(ADCSRA,ADSC)); // Detect end-of-conversion wADC = ADCW; // Reading register "ADCW" takes care of how to read ADCL and ADCH. t = (wADC - 88.0 ) / 1.0; // The default offset is 324.31. return (t); // The returned temperature in degrees Celcius. } /********************************************* * * Sends temperature and humidity from Si7021 sensor * Parameters * - force : Forces transmission of a value (even if it's the same as previous measurement) *********************************************/ void sendTempHumidityMeasurements(bool force) { bool tx = force; float temperature = humiditySensor.readTemperature(); DEBUG_PRINT("T: ");DEBUG_PRINTLN(temperature); float diffTemp = abs(lastTemperature - temperature); DEBUG_PRINT(F("TempDiff :"));DEBUG_PRINTLN(diffTemp); if (diffTemp > TEMP_TRANSMIT_THRESHOLD || tx) { send(msgTemp.set(temperature,1)); lastTemperature = temperature; measureCount = 0; DEBUG_PRINTLN("T sent!"); } int humidity = humiditySensor.readHumidity(); DEBUG_PRINT("H: ");DEBUG_PRINTLN(humidity); raHum.addValue(humidity); humidity = raHum.getAverage(); // MA sample imply reasonable fast sample frequency float diffHum = abs(lastHumidity - humidity); DEBUG_PRINT(F("HumDiff :"));DEBUG_PRINTLN(diffHum); if (diffHum > HUMI_TRANSMIT_THRESHOLD || tx) { send(msgHum.set(humidity)); lastHumidity = humidity; measureCount = 0; DEBUG_PRINTLN("H sent!"); } }I am at 1+ hours since last transmission.
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@wergeld It looks like it's set to 3 hrs.
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@m26872
Indeed it does. Just was throwing me off with the wording. I read it as "1/2 hour" or "1/3 hour". So far I am prepping up more nodes. Have 4 more 328s to programs and build out. I am thinking at the end I will have:- Gateway (serial or the direct connect nrf+ once it supports v2)
- Temp/Hum node using HTU21D for back porch sending every 5 minutes and force send every 30 minutes.
- Temp/Hum node using HTU21D inside using same send times.
- Parking sensor in garage hardwired to mains.
5 & 6 I am not sure yet.
Lots of fun so far.
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I am seeing 5.0 μA at sleep and 12.4 mA when transmitting. Seems kind of high. I did the poor man's test as well - put an LED across the HTU21D power pins and it lit up. Same when I did it across the nrf's power pins. Shouldn't the MySensors code turn off the power rails during sleep?
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No, the powerrails are not turned off, just the devices themselves.
5uA during sleep is about right. The 12.4mA during transmit is also normal, but the transmit time should be very short, so on average the total consumption of power will be low.
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@GertSanders Excellent! I was hoping I hadn't wired it up wrong. So far the 2 nodes have been flawless for the past 3 days. Next step is to await the direct attached NRF serial gateway to be v2 compatible. Been following along with this thread. Looks like we are getting closer! I have 2 RPis (one a first gen B and the other a Pi2 B ) with this adapter by ceech:
https://www.openhardware.io/view/100/Raspberry-PI-NRF24l01-hat
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Hi everyone,
First thanks for sharing. I love this slim node. But I am facing some issues I did not success to debug. So I use the code shared here for mysensors 2. I try with the mysensors exemple library (did not work at all). I try with the https://github.com/LowPowerLab/SI7021 which worked (at least for getting separately temperature and humidity and using the example file) on an arduino nano. But when I run this sensor with the slim node (red, boot loader 8mhz) and the code (for 2.0.0) I always get -46.85 for temperature and 118 for humidity. Otherwise the radio work normally.
Winter is coming and I don't know what I could do anymore. Thanks to share you idea on this.
With the example code I use on the nano. I get with the slim node:
T: -46.85 H: 118 device ID: 50With Arduino nano:
T: 24.34 H: 43 device ID: 50
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Why actually my device id is 50 ? for what 50 stands !?!?!
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@clempat Please post your sketch and maybe some hardware photo or diagram too.
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@m26872 Sure I can do that. So I simplified the code to only focus on the si7021.
Here it is: https://github.com/clempat/example-si7021
And there the photo:
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@clempat Don't think I can help you. Maybe clock related. What voltages do you use on Nano and Slim respectively? Do you have multiple parts to try with and get the same result? Why do you include and start wire.h, isn't already in Si7021.h ? My guess on "device Id 50" is that it's just a chinese clone reply.
Photos look nice btw.
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@m26872 Thank you. Yes I wanted to try with a pro mini 8Mhz but I need to prepare the pin 4 and 5. I will keep inform when I do it this week end.
Thanks for the picture but with this nice setup it is difficult to make it bad :)...
I includes wire.h like in the exemple in https://github.com/LowPowerLab/SI7021 but of course after I tried without. The nano was directly connected to usb and the slim through 3,3V USB to serial.
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Ok with the arduino micro 8Mhz all works good too.
Reading... T: 20.29 H: 54 device ID: 50
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So sad I still not getting it working with the slim node
!!! Always same result either with internal 1mhz or 8mhz...
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@clempat Make it with external 8MHz then ? Then it should be like a Pro Mini 3.3V.
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@m26872 I will give a try and let you know... Thanks.
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Hello
I also have big problems with getting the node to send temp and hum values
It starts up and presents itself to the GW but then nothing happensI have tested the SI721 module with a simple arduino code and then it reads and prints both values just fine
My code is below, in practice its a version of Sensebender Micro code. I have changed the force transmit value to 1
Exactly as @clempat I have tried both 1MHz optiboot and 8MHz internal oscillator without any success/** * The MySensors Arduino library handles the wireless radio link and protocol * between your home built sensors/actuators and HA controller of choice. * The sensors forms a self healing radio network with optional repeaters. Each * repeater and gateway builds a routing tables in EEPROM which keeps track of the * network topology allowing messages to be routed to nodes. * * Created by Henrik Ekblad <henrik.ekblad@mysensors.org> * Copyright (C) 2013-2015 Sensnology AB * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors * * Documentation: http://www.mysensors.org * Support Forum: http://forum.mysensors.org * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * ******************************* * * REVISION HISTORY * Version 1.0 - Thomas Bowman MC8rch * * DESCRIPTION * Default sensor sketch for Sensebender Micro module * Act as a temperature / humidity sensor by default. * * If A0 is held low while powering on, it will enter testmode, which verifies all on-board peripherals * * Battery voltage is as battery percentage (Internal message), and optionally as a sensor value (See defines below) * * * Version 1.3 - Thomas Bowman MC8rch * Improved transmission logic, eliminating spurious transmissions (when temperatuere / humidity fluctuates 1 up and down between measurements) * Added OTA boot mode, need to hold A1 low while applying power. (uses slightly more power as it's waiting for bootloader messages) * * Version 1.4 - Thomas Bowman MC8rch * * Corrected division in the code deciding whether to transmit or not, that resulted in generating an integer. Now it's generating floats as expected. * Simplified detection for OTA bootloader, now detecting if MY_OTA_FIRMWARE_FEATURE is defined. If this is defined sensebender automaticly waits 300mS after each transmission * Moved Battery status messages, so they are transmitted together with normal sensor updates (but only every 60th minute) * */ // Enable debug prints to serial monitor #define MY_DEBUG // Define a static node address, remove if you want auto address assignment //#deine MY_NODE_ID 3 // Enable and select radio type attached #define MY_RADIO_NRF24 //#define MY_RADIO_RFM69 #include <SPI.h> #include <MySensors.h> #include <Wire.h> #include <SI7021-master\SI7021.h> #include <RunningAverage.h> // Uncomment the line below, to transmit battery voltage as a normal sensor value #define BATT_SENSOR 199 #define RELEASE "1.4" #define AVERAGES 2 // Child sensor ID's #define CHILD_ID_TEMP 1 #define CHILD_ID_HUM 2 // How many milli seconds between each measurement #define MEASURE_INTERVAL 60000 // FORCE_TRANSMIT_INTERVAL, this number of times of wakeup, the sensor is forced to report all values to the controller #define FORCE_TRANSMIT_INTERVAL 1 // When MEASURE_INTERVAL is 60000 and FORCE_TRANSMIT_INTERVAL is 30, we force a transmission every 30 minutes. // Between the forced transmissions a tranmission will only occur if the measured value differs from the previous measurement // HUMI_TRANSMIT_THRESHOLD tells how much the humidity should have changed since last time it was transmitted. Likewise with // TEMP_TRANSMIT_THRESHOLD for temperature threshold. #define HUMI_TRANSMIT_THRESHOLD 0.5 #define TEMP_TRANSMIT_THRESHOLD 0.5 SI7021 humiditySensor; // Sensor messages MyMessage msgHum(CHILD_ID_HUM, V_HUM); MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP); #ifdef BATT_SENSOR MyMessage msgBatt(BATT_SENSOR, V_VOLTAGE); #endif // Global settings int measureCount = 0; int sendBattery = 0; boolean isMetric = true; boolean highfreq = true; boolean transmission_occured = false; // Storage of old measurements float lastTemperature = -100; int lastHumidity = -100; long lastBattery = -100; RunningAverage raHum(AVERAGES); /**************************************************** * * Setup code * ****************************************************/ void setup() { Serial.begin(9600); Serial.print(F("Sensebender Micro FW ")); Serial.print(RELEASE); Serial.flush(); humiditySensor.begin(); Serial.flush(); Serial.println(F(" - Online!")); isMetric = getConfig().isMetric; Serial.print(F("isMetric: ")); Serial.println(isMetric); raHum.clear(); sendTempHumidityMeasurements(false); sendBattLevel(false); } void presentation() { sendSketchInfo("TempHum", RELEASE); present(CHILD_ID_TEMP, S_TEMP); present(CHILD_ID_HUM, S_HUM); #ifdef BATT_SENSOR present(BATT_SENSOR, S_POWER); #endif } /*********************************************** * * Main loop function * ***********************************************/ void loop() { measureCount++; sendBattery++; bool forceTransmit = false; transmission_occured = false; if (measureCount > FORCE_TRANSMIT_INTERVAL) { // force a transmission forceTransmit = true; measureCount = 0; } sendTempHumidityMeasurements(forceTransmit); /* if (sendBattery > 60) { sendBattLevel(forceTransmit); // Not needed to send battery info that often sendBattery = 0; }*/ sleep(MEASURE_INTERVAL); } /********************************************* * * Sends temperature and humidity from Si7021 sensor * * Parameters * - force : Forces transmission of a value (even if it's the same as previous measurement) * *********************************************/ void sendTempHumidityMeasurements(bool force) { bool tx = force; si7021_env data = humiditySensor.getHumidityAndTemperature(); raHum.addValue(data.humidityPercent); float diffTemp = abs(lastTemperature - (isMetric ? data.celsiusHundredths : data.fahrenheitHundredths) / 100.0); float diffHum = abs(lastHumidity - raHum.getAverage()); Serial.print(F("TempDiff :"));Serial.println(diffTemp); Serial.print(F("HumDiff :"));Serial.println(diffHum); if (isnan(diffHum)) tx = true; if (diffTemp > TEMP_TRANSMIT_THRESHOLD) tx = true; if (diffHum > HUMI_TRANSMIT_THRESHOLD) tx = true; if (tx) { measureCount = 0; float temperature = (isMetric ? data.celsiusHundredths : data.fahrenheitHundredths) / 100.0; int humidity = data.humidityPercent; Serial.print("T: ");Serial.println(temperature); Serial.print("H: ");Serial.println(humidity); send(msgTemp.set(temperature, 1)); send(msgHum.set(humidity)); lastTemperature = temperature; lastHumidity = humidity; transmission_occured = true; if (sendBattery > 60) { sendBattLevel(true); // Not needed to send battery info that often sendBattery = 0; } } } /******************************************** * * Sends battery information (battery percentage) * * Parameters * - force : Forces transmission of a value * *******************************************/ void sendBattLevel(bool force) { if (force) lastBattery = -1; long vcc = readVcc(); if (vcc != lastBattery) { lastBattery = vcc; #ifdef BATT_SENSOR float send_voltage = float(vcc) / 1000.0f; send(msgBatt.set(send_voltage, 3)); #endif // Calculate percentage vcc = vcc - 1900; // subtract 1.9V from vcc, as this is the lowest voltage we will operate at long percent = vcc / 14.0; sendBatteryLevel(percent); transmission_occured = true; } } /******************************************* * * Internal battery ADC measuring * *******************************************/ long readVcc() { // Read 1.1V reference against AVcc // set the reference to Vcc and the measurement to the internal 1.1V reference #if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) ADMUX = _BV(REFS0) | _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1); #elif defined (__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__) ADMUX = _BV(MUX5) | _BV(MUX0); #elif defined (__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__) ADcdMUX = _BV(MUX3) | _BV(MUX2); #else ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1); #endif delay(2); // Wait for Vref to settle ADCSRA |= _BV(ADSC); // Start conversion while (bit_is_set(ADCSRA, ADSC)); // measuring uint8_t low = ADCL; // must read ADCL first - it then locks ADCH uint8_t high = ADCH; // unlocks both long result = (high << 8) | low; result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000 return result; // Vcc in millivolts }
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It would be interesting if someone with issues also tried older versions of libs for Si7021 and/or MySensors.
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So, after a few months of 2 nodes up and running using the HTU21D sensor I have come the conclusion that the HTU21D is no good for where I live. Lately it has been getting cooler outside (down to mid 50s F) but humidity is still high. As the evening progresses the humidity gets to 100% and the node no longer sends data. This happens around 6pm every day (about half and hour after sunset). It then comes back online at about 10 am the next day. The node that I have inside does not have this issue (same shipment of arduino, pcb, and HTU21D sensors and the same arduino code). Both running off of fresh AAs. May need to upgrade to the SI7021 for outside node.
Here is the graph showing last 7 days. As you can see it flatlines (literally!) at 100% humidity!
All good times with the learning!
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@wergeld Relative humidity at 100% during night sounds very realistic to me. Are you confusing it with the "absolute humidity"? Or is your concern that the "force transmit" isn't working?
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Mine does the same, but it's also very humid at night - I think this is normal behavoir
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@m26872 & @bjacobse - Yes, 100% humidity is normal here. Good old Florida! My concern is that the node stops reporting. Possibly due to condensation shorting out something. During the summer here we also hit 100% humidity but it is also a lot hotter (high 90s). Now, I think that the cooler temps are forcing a dew point that is allowing water to condense on the node. Then during the morning it drys out and resumes transmitting. I would like to find a way to stop this.
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@m26872 I have looked at a lot of those links. I am leaning towards covering my node in non-reactive glue. This will seal all contacts. The only part that would be difficult would be the actual teeny tiny sensor chip on the HTU21D. Hopefully any condensation there can be minimal. The next step would be to make sure the battery case is sealed as well (although I do not think this will be much of an issue).
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Do you have some battery saving stuff in your code, so you maybe wakeup check temp + humidity, and if they are same value as previous, then go back to sleep - no need to use battery usage to send same values again, this can cause your sensor to not report values
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@bjacobse Yes, I am checking the values and if the same as last transmission I abort and go back to sleep. If, however, it has been 3 hours since last transmission I force it to send.
