💬 Battery Powered Sensors
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@Nicklas-Starkel you put them in serial. So:
battery+ to multimeter- (set to uA mode)
Multimeter+ to vcc
Battery- to gndYou need a very sensitive multimeter though. Most multimeters won't be able to measure low current reliably.
@mfalkvidd that's what I thought! I see that I'm getting 3.4V in the multimeter but my pro mini nor nano will start up (I have not removed the LEDs so they should light up).
If I use more V (6.8V) I put in via RAW on the PRO mini, and I can see teh voltage, but the same thing, it's not starting up, hmmm I wonder what rookie mistake I'm doing! -
@mfalkvidd that's what I thought! I see that I'm getting 3.4V in the multimeter but my pro mini nor nano will start up (I have not removed the LEDs so they should light up).
If I use more V (6.8V) I put in via RAW on the PRO mini, and I can see teh voltage, but the same thing, it's not starting up, hmmm I wonder what rookie mistake I'm doing!@Nicklas-Starkel sounds like you have the multimeter set to measure voltage instead of current. Which multimeter model are you using? Could you post a photo? There is usually a dial that can be turned to switch mode. Many multimeters also require moving one of the probes to a different connector (on the multimeter itself).
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@Nicklas-Starkel sounds like you have the multimeter set to measure voltage instead of current. Which multimeter model are you using? Could you post a photo? There is usually a dial that can be turned to switch mode. Many multimeters also require moving one of the probes to a different connector (on the multimeter itself).
@mfalkvidd , it was too late at night for me.
I had it at current but it didn't show anything. So without thinking I put it at voltage.
And the problem with not showing anything when I had it at current was I had blown the internal multimeter fuse some days ago.
Ehrmm.. yes. move along, nothing to see here :) -
@mfalkvidd , it was too late at night for me.
I had it at current but it didn't show anything. So without thinking I put it at voltage.
And the problem with not showing anything when I had it at current was I had blown the internal multimeter fuse some days ago.
Ehrmm.. yes. move along, nothing to see here :) -
Hello,
Did you put this command in the setup sketch ?
analogReference(INTERNAL); -
@tonnerre33, yes I've analogReference(INTERNAL); in setup()
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It's normal to have 1.1V on A0 when you have 3.3V on your batteries.
Where did you get the 1.11V value ? In the serial print or with your multimeter ?
If you read the value with the serial print, which variable is it (sensorValue or batteryV) ? -
@tonnerre33 in the serial print and MySensor MQTT gateway
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@tonnerre33, I'm trying to build arduio that can run on 2 AA batteries. I'm using MySensors for library and building arduino circuit based on this https://openhomeautomation.net/arduino-battery/
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Can you post the logs of your node and the skech used ?
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@tonnerre33, I'm trying to build arduio that can run on 2 AA batteries. I'm using MySensors for library and building arduino circuit based on this https://openhomeautomation.net/arduino-battery/
@bjacobt https://www.mysensors.org/build/battery#measuring-and-reporting-battery-level describes how the battery voltage is calculated and the example sketch has code for doing the calculation. Looks like you've missed reading this part:
// 1M, 470K divider across battery and using internal ADC ref of 1.1V // Sense point is bypassed with 0.1 uF cap to reduce noise at that point // ((1e6+470e3)/470e3)*1.1 = Vmax = 3.44 Volts // 3.44/1023 = Volts per bit = 0.003363075 ... float batteryV = sensorValue * 0.003363075; -
Can you post the logs of your node and the skech used ?
@tonnerre33
Here are the logs from Arduino Serial consoleStarting sensor (RNNNA-, 2.0.0) TSM:INIT TSM:RADIO:OK TSP:ASSIGNID:OK (ID=101) TSM:FPAR TSP:MSG:SEND 101-101-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=bc: TSP:MSG:READ 0-0-101 s=255,c=3,t=8,pt=1,l=1,sg=0:0 TSP:MSG:FPAR RES (ID=0, dist=0) TSP:MSG:PAR OK (ID=0, dist=1) TSM:FPAR:OK TSM:ID TSM:CHKID:OK (ID=101) TSM:UPL TSP:PING:SEND (dest=0) TSP:MSG:SEND 101-101-0-0 s=255,c=3,t=24,pt=1,l=1,sg=0,ft=0,st=ok:1 TSP:MSG:READ 0-0-101 s=255,c=3,t=25,pt=1,l=1,sg=0:1 TSP:MSG:PONG RECV (hops=1) TSP:CHKUPL:OK TSM:UPL:OK TSM:READY TSP:MSG:SEND 101-101-0-0 s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=ok:0100 !TSP:MSG:SEND 101-101-0-0 s=255,c=0,t=17,pt=0,l=5,sg=0,ft=0,st=fail:2.0.0 TSP:MSG:SEND 101-101-0-0 s=255,c=3,t=6,pt=1,l=1,sg=0,ft=1,st=ok:0 TSP:MSG:READ 0-0-101 s=255,c=3,t=15,pt=6,l=2,sg=0:0100 TSP:MSG:SEND 101-101-0-0 s=255,c=3,t=11,pt=0,l=13,sg=0,ft=0,st=ok:Battery Meter TSP:MSG:SEND 101-101-0-0 s=255,c=3,t=12,pt=0,l=3,sg=0,ft=0,st=ok:1.0 Request registration... TSP:MSG:SEND 101-101-0-0 s=255,c=3,t=26,pt=1,l=1,sg=0,ft=0,st=ok:2 TSP:MSG:READ 0-0-101 s=255,c=3,t=27,pt=1,l=1,sg=0:1 Node registration=1 Init complete, id=101, parent=0, distance=1, registration=1 330 Battery Voltage: 1.11 V Battery percent: 33 % TSP:MSG:SEND 101-101-0-0 s=255,c=3,t=0,pt=1,l=1,sg=0,ft=0,st=ok:33The sketch used is this:
/** * 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. * ******************************* * * DESCRIPTION * * This is an example that demonstrates how to report the battery level for a sensor * Instructions for measuring battery capacity on A0 are available here: * http://www.mysensors.org/build/battery * */ #define MY_NODE_ID 101 // Enable debug prints to serial monitor #define MY_DEBUG // Enable and select radio type attached #define MY_RADIO_NRF24 //#define MY_RADIO_RFM69 #include <MySensors.h> int BATTERY_SENSE_PIN = A0; // select the input pin for the battery sense point unsigned long SLEEP_TIME = 100000; // sleep time between reads (seconds * 1000 milliseconds) int oldBatteryPcnt = 0; void setup() { // use the 1.1 V internal reference #if defined(__AVR_ATmega2560__) analogReference(INTERNAL1V1); #else analogReference(INTERNAL); #endif } void presentation() { // Send the sketch version information to the gateway and Controller sendSketchInfo("Battery Meter", "1.0"); } void loop() { // get the battery Voltage int sensorValue = analogRead(BATTERY_SENSE_PIN); #ifdef MY_DEBUG Serial.println(sensorValue); #endif // 1M, 470K divider across battery and using internal ADC ref of 1.1V // Sense point is bypassed with 0.1 uF cap to reduce noise at that point // ((1e6+470e3)/470e3)*1.1 = Vmax = 3.44 Volts // 3.44/1023 = Volts per bit = 0.003363075 int batteryPcnt = sensorValue / 10; #ifdef MY_DEBUG float batteryV = sensorValue * 0.003363075; Serial.print("Battery Voltage: "); Serial.print(batteryV); Serial.println(" V"); Serial.print("Battery percent: "); Serial.print(batteryPcnt); Serial.println(" %"); #endif if (oldBatteryPcnt != batteryPcnt) { // Power up radio after sleep sendBatteryLevel(batteryPcnt); oldBatteryPcnt = batteryPcnt; } sleep(SLEEP_TIME); }``` What I see on the gateway is:mysGateway: TSF:MSG:READ,101-101-255,s=255,c=3,t=7,pt=0,l=0,sg=0:
mysGateway: TSF:MSG:BC
mysGateway: TSF:MSG:FPAR REQ,ID=101
mysGateway: TSF:PNG:SEND,TO=0
mysGateway: TSF:CKU:OK
mysGateway: TSF:MSG:GWL OK
mysGateway: TSF:MSG:SEND,0-0-101-101,s=255,c=3,t=8,pt=1,l=1,sg=0,ft=0,st=OK:0
mysGateway: TSF:MSG:READ,101-101-0,s=255,c=3,t=24,pt=1,l=1,sg=0:1
mysGateway: TSF:MSG:PINGED,ID=101,HP=1
mysGateway: TSF:MSG:SEND,0-0-101-101,s=255,c=3,t=25,pt=1,l=1,sg=0,ft=0,st=OK:1
mysGateway: TSF:MSG:READ,101-101-0,s=255,c=3,t=15,pt=6,l=2,sg=0:0100
mysGateway: !TSF:MSG:SEND,0-0-101-101,s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=NACK:0100
mysGateway: TSF:MSG:READ,101-101-0,s=255,c=3,t=6,pt=1,l=1,sg=0:0
mysGateway: Sending message on topic: mysensors-out/101/255/3/0/6
mysGateway: TSF:MSG:READ,101-101-255,s=255,c=3,t=7,pt=0,l=0,sg=0:
mysGateway: TSF:MSG:BC
mysGateway: TSF:MSG:FPAR REQ,ID=101
mysGateway: TSF:CKU:OK,FCTRL
mysGateway: TSF:MSG:GWL OK
mysGateway: TSF:MSG:SEND,0-0-101-101,s=255,c=3,t=8,pt=1,l=1,sg=0,ft=0,st=OK:0
mysGateway: TSF:MSG:READ,101-101-0,s=255,c=3,t=24,pt=1,l=1,sg=0:1
mysGateway: TSF:MSG:PINGED,ID=101,HP=1
mysGateway: TSF:MSG:SEND,0-0-101-101,s=255,c=3,t=25,pt=1,l=1,sg=0,ft=0,st=OK:1
mysGateway: TSF:MSG:READ,101-101-0,s=255,c=3,t=15,pt=6,l=2,sg=0:0100
mysGateway: !TSF:MSG:SEND,0-0-101-101,s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=NACK:0100
mysGateway: TSF:MSG:READ,101-101-0,s=255,c=3,t=6,pt=1,l=1,sg=0:0
mysGateway: Sending message on topic: mysensors-out/101/255/3/0/6
mysGateway: TSF:MSG:READ,101-101-0,s=255,c=3,t=11,pt=0,l=13,sg=0:Battery Meter
mysGateway: Sending message on topic: mysensors-out/101/255/3/0/11
mysGateway: TSF:MSG:READ,101-101-0,s=255,c=3,t=12,pt=0,l=3,sg=0:1.0
mysGateway: Sending message on topic: mysensors-out/101/255/3/0/12
mysGateway: TSF:MSG:READ,101-101-0,s=255,c=3,t=26,pt=1,l=1,sg=0:2
mysGateway: TSF:MSG:SEND,0-0-101-101,s=255,c=3,t=27,pt=1,l=1,sg=0,ft=0,st=OK:1
mysGateway: TSF:MSG:READ,101-101-0,s=255,c=3,t=0,pt=1,l=1,sg=0:33
mysGateway: Sending message on topic: mysensors-out/101/255/3/0/0```Thank for your help!
Jacob -
@bjacobt https://www.mysensors.org/build/battery#measuring-and-reporting-battery-level describes how the battery voltage is calculated and the example sketch has code for doing the calculation. Looks like you've missed reading this part:
// 1M, 470K divider across battery and using internal ADC ref of 1.1V // Sense point is bypassed with 0.1 uF cap to reduce noise at that point // ((1e6+470e3)/470e3)*1.1 = Vmax = 3.44 Volts // 3.44/1023 = Volts per bit = 0.003363075 ... float batteryV = sensorValue * 0.003363075; -
hi @mfalkvidd,
Do you mind clarifying a bit, I've done sensorValue * 0.003363075
analogRead(BATTERY_SENSE_PIN);Gives me 330, so
330 * 0.003363075 = 1.10981475 voltsThank You!
Jacob -
analogRead(BATTERY_SENSE_PIN);must give you 1023 and not 330.
For me it's a problem of value resistance or analogReference.Try to add this
analogReference(INTERNAL); sensorValue = analogRead(BATTERY_SENSE_PIN); #ifdef MY_DEBUG Serial.print("Value A0 before force reference: "); Serial.print(sensorValue); #endif delay(10000); sensorValue = analogRead(BATTERY_SENSE_PIN); #ifdef MY_DEBUG Serial.print("Value A0 after force reference: "); Serial.print(sensorValue); #endifJust after this existing code :
#ifdef MY_DEBUG Serial.println(sensorValue); #endifAnd plz send me the logs of the node ;)
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analogRead(BATTERY_SENSE_PIN);must give you 1023 and not 330.
For me it's a problem of value resistance or analogReference.Try to add this
analogReference(INTERNAL); sensorValue = analogRead(BATTERY_SENSE_PIN); #ifdef MY_DEBUG Serial.print("Value A0 before force reference: "); Serial.print(sensorValue); #endif delay(10000); sensorValue = analogRead(BATTERY_SENSE_PIN); #ifdef MY_DEBUG Serial.print("Value A0 after force reference: "); Serial.print(sensorValue); #endifJust after this existing code :
#ifdef MY_DEBUG Serial.println(sensorValue); #endifAnd plz send me the logs of the node ;)
@tonnerre33 Its still the same
Starting sensor (RNNNA-, 2.0.0)
TSM:INIT
TSM:RADIO:OK
TSP:ASSIGNID:OK (ID=101)
TSM:FPAR
TSP:MSG:SEND 101-101-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=bc:
TSP:MSG:READ 0-0-101 s=255,c=3,t=8,pt=1,l=1,sg=0:0
TSP:MSG:FPAR RES (ID=0, dist=0)
TSP:MSG:PAR OK (ID=0, dist=1)
TSM:FPAR:OK
TSM:ID
TSM:CHKID:OK (ID=101)
TSM:UPL
TSP:PING:SEND (dest=0)
TSP:MSG:SEND 101-101-0-0 s=255,c=3,t=24,pt=1,l=1,sg=0,ft=0,st=ok:1
TSP:MSG:READ 0-0-101 s=255,c=3,t=25,pt=1,l=1,sg=0:1
TSP:MSG:PONG RECV (hops=1)
TSP:CHKUPL:OK
TSM:UPL:OK
TSM:READY
TSP:MSG:SEND 101-101-0-0 s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=ok:0100
TSP:MSG:SEND 101-101-0-0 s=255,c=0,t=17,pt=0,l=5,sg=0,ft=0,st=ok:2.0.0
TSP:MSG:SEND 101-101-0-0 s=255,c=3,t=6,pt=1,l=1,sg=0,ft=0,st=ok:0
TSP:MSG:READ 0-0-101 s=255,c=3,t=15,pt=6,l=2,sg=0:0100
TSP:MSG:SEND 101-101-0-0 s=255,c=3,t=11,pt=0,l=13,sg=0,ft=0,st=ok:Battery Meter
TSP:MSG:SEND 101-101-0-0 s=255,c=3,t=12,pt=0,l=3,sg=0,ft=0,st=ok:1.0
Request registration...
TSP:MSG:SEND 101-101-0-0 s=255,c=3,t=26,pt=1,l=1,sg=0,ft=0,st=ok:2
TSP:MSG:READ 0-0-101 s=255,c=3,t=27,pt=1,l=1,sg=0:1
Node registration=1
Init complete, id=101, parent=0, distance=1, registration=1
330
Value A0 before force reference: 327
Value A0 after force reference: 329
Battery Voltage: 1.11 V
Battery percent: 32 %
TSP:MSG:SEND 101-101-0-0 s=255,c=3,t=0,pt=1,l=1,sg=0,ft=0,st=ok:32/** * 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. * ******************************* * * DESCRIPTION * * This is an example that demonstrates how to report the battery level for a sensor * Instructions for measuring battery capacity on A0 are available here: * http://www.mysensors.org/build/battery * */ #define MY_NODE_ID 101 // Enable debug prints to serial monitor #define MY_DEBUG // Enable and select radio type attached #define MY_RADIO_NRF24 //#define MY_RADIO_RFM69 #include <MySensors.h> int BATTERY_SENSE_PIN = A0; // select the input pin for the battery sense point unsigned long SLEEP_TIME = 100000; // sleep time between reads (seconds * 1000 milliseconds) int oldBatteryPcnt = 0; void setup() { // use the 1.1 V internal reference #if defined(__AVR_ATmega2560__) analogReference(INTERNAL1V1); #else analogReference(INTERNAL); #endif } void presentation() { // Send the sketch version information to the gateway and Controller sendSketchInfo("Battery Meter", "1.0"); } void loop() { // get the battery Voltage int sensorValue = analogRead(BATTERY_SENSE_PIN); #ifdef MY_DEBUG Serial.println(sensorValue); #endif analogReference(INTERNAL); sensorValue = analogRead(BATTERY_SENSE_PIN); #ifdef MY_DEBUG Serial.print("Value A0 before force reference: "); Serial.println(sensorValue); #endif delay(10000); sensorValue = analogRead(BATTERY_SENSE_PIN); #ifdef MY_DEBUG Serial.print("Value A0 after force reference: "); Serial.println(sensorValue); #endif // 1M, 470K divider across battery and using internal ADC ref of 1.1V // Sense point is bypassed with 0.1 uF cap to reduce noise at that point // ((1e6+470e3)/470e3)*1.1 = Vmax = 3.44 Volts // 3.44/1023 = Volts per bit = 0.003363075 int batteryPcnt = sensorValue / 10; #ifdef MY_DEBUG float batteryV = sensorValue * 0.003363075; Serial.print("Battery Voltage: "); Serial.print(batteryV); Serial.println(" V"); Serial.print("Battery percent: "); Serial.print(batteryPcnt); Serial.println(" %"); #endif if (oldBatteryPcnt != batteryPcnt) { // Power up radio after sleep sendBatteryLevel(batteryPcnt); oldBatteryPcnt = batteryPcnt; } sleep(SLEEP_TIME); }``` -
Ok it's not a problem with the analogReference, you can delete this part of code.
Did you control your resistance value and did you do this schema ?
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Ok try to remove the jumper between V+ and AREF
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