My 2AA battery sensor
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@funky81 said:
@m26872 I still dont get it. Why I cant get the same efficient power like you....
I see that your sketch uses the internal battery monitoring method. That isn't possible when using the design as in this threads subject, with a step-up regulator that makes Vbat different from Vcc. Are you sure you're not confusing my design with EaysIoTs ?
Anyhow, I can't explain the sleep mode consumption, it seems like something isn't sleeping like it should.
Here's my sketch for Node 105/106:
// Egen kombo-nod för DHT22, BMP180 och batterimonitering. // 20141019 // DHT-22 Working voltage: DC 3.3-5.5V (so connect after step-up regulator). http://www.adafruit.com/datasheets/Digital%20humidity%20and%20temperature%20sensor%20AM2302.pdf // BMP180 (compatible with BMP085) working voltage 1.8-3.6V. Different boards with different power and pullups. Datasheet for ic only: http://www.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf #include <SPI.h> #include <MySensor.h> #include <DHT.h> #include <Wire.h> #include <Adafruit_BMP085.h> // N.b. The new library includes the function readSealevelPressure() #define NODE_ID 106 // Manually asign Node Id <<<<<<<<<<<<<<<<<<< ENTER THIS !!!! #define ONE_WIRE_BUS 3 // Pin where dallase sensor bus is connected. <<<<<<<<<<<<<<< DON'T FORGET 4k7 PULL-UP !!! >>>>>>>>>>>>>>>> #define VBAT_PER_BITS 0.003363075 // Calculated volts per bit from the used battery montoring voltage divider. Internal_ref=1.1V, res=10bit=2^10-1=1023, Eg for 3V (2AA): Vin/Vb=R1/(R1+R2)=470e3/(1e6+470e3), Vlim=Vb/Vin*1.1=3.44V, Volts per bit = Vlim/1023= 0.003363075 #define VMIN 1.9 // Battery monitor lower level. Vmin_radio=1.9V #define VMAX 3.3 // " " " high level. Vmin<Vmax<=3.44 #define CHILD_ID_HUM 0 #define CHILD_ID_TEMP 1 #define BARO_CHILD 2 //#define TEMP_CHILD 3 // Commented since don't need the Bmp tempsensor #define HUMIDITY_SENSOR_DIGITAL_PIN 3 // <<<<<<<<<<<<<<<<<<<<<<<< Use 4k7 Pull-up. MySensors webpage doesn't use, datasheet does. Adafruit does https://learn.adafruit.com/dht/using-a-dhtxx-sensor unsigned long SLEEP_TIME = 15*60000; // sleep time between reads (in milliseconds) unsigned long preSleepTime = 5*60000; // sleep time for extra pre hum-reading for simple avaraging filter Adafruit_BMP085 bmp = Adafruit_BMP085(); // Digital Pressure Sensor MySensor gw; DHT dht; float lastTemp; float lastHum; float lastPressure = -1; //float lastBmpTemp = -1; // Commented since don't need the Bmp tempsensor MyMessage msgHum(CHILD_ID_HUM, V_HUM); MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP); //MyMessage tempMsg(TEMP_CHILD, V_TEMP); // Commented since don't need the Bmp tempsensor MyMessage pressureMsg(BARO_CHILD, V_PRESSURE); int BATTERY_SENSE_PIN = A0; // select the input pin for the battery sense point int oldBatteryPcnt = 0; void setup() { analogReference(INTERNAL); // use the 1.1 V internal reference for battery level measuring delay(500); // Allow time for radio if power used as reset <<<<<<<<<<<<<< Experimented with good result gw.begin(NULL,NODE_ID); // Startup and initialize MySensors library. Set callback for incoming messages. dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN); gw.sendSketchInfo("EgHumBarTemBatv2", "2.0 20141110"); // Send the Sketch Version Information to the Gateway if (!bmp.begin()) { Serial.println("Could not find a valid BMP085 sensor, check wiring!"); while (1) { } } gw.present(CHILD_ID_HUM, S_HUM); // Register all sensors to gw (they will be created as child devices) gw.present(CHILD_ID_TEMP, S_TEMP); gw.present(BARO_CHILD, S_BARO); // gw.present(TEMP_CHILD, S_TEMP); // Commented since don't need the Bmp tempsensor } void loop() { delay(dht.getMinimumSamplingPeriod()); float humidity_1 = dht.getHumidity(); if (isnan(humidity_1)) { Serial.println("Failed reading humidity_1 from DHT"); } // else { // Serial.print("Hum1: "); // Serial.println(humidity_1); // } gw.sleep(preSleepTime); //sleep shortly until the "real" processing happens delay(dht.getMinimumSamplingPeriod()); float humidity_2 = dht.getHumidity(); if (isnan(humidity_2)) { Serial.println("Failed reading humidity_2 from DHT"); } // else { // Serial.print("Hum2: "); // Serial.println(humidity_2); // } if ( isnan(humidity_1) && isnan(humidity_2) ) { Serial.println("Failed reading humidity_1 and humidity_2 from DHT"); } else if ( isnan(humidity_2) && !isnan(humidity_1) ) { // && abs(humidity_1-lastHum)>2. ) { // Ev hysteres gw.send(msgHum.set(humidity_1, 1)); lastHum = humidity_1; // Serial.println("Humidity_1 sent to gw."); } else if ( isnan(humidity_1) && !isnan(humidity_2) ) { // && abs(humidity_2-lastHum)>2. ) { gw.send(msgHum.set(humidity_2, 1)); lastHum = humidity_2; // Serial.println("Humidity_2 sent to gw."); } else { // Serial.println("Else mean calc"); float humidity_m = (humidity_1+humidity_2)/2. ; // Averageing the two. // if ( abs(humidity_m-lastHum) > 2. ) { gw.send(msgHum.set(humidity_m, 1)); lastHum = humidity_m; // Serial.println("The mean humidity_m sent to gw."); // } } float temperature = dht.getTemperature(); if (isnan(temperature)) { Serial.println("Failed reading temperature from DHT"); } else if (temperature != lastTemp) { lastTemp = temperature; gw.send(msgTemp.set(temperature, 1)); // Always send temperature // Serial.print("Sent temp: "); // Serial.println(temperature); } float pressure = bmp.readPressure()/100; // float pressureS = bmp.readSealevelPressure(75.)/100; // Serial.print("Pressure = "); Serial.print(pressure); Serial.println(" Pa"); // Serial.print("SeaLevelPressure = "); Serial.print(pressureS); Serial.println(" Pa"); if (pressure != lastPressure) { gw.send(pressureMsg.set(pressure, 0)); lastPressure = pressure; // Serial.print("Sent pressure: "); // Serial.println(pressure); } // float bmpTemperature = bmp.readTemperature(); // Commented since don't need the Bmp tempsensor //// Serial.print("Temperature = "); Serial.print(bmpTemperature); Serial.println(" *C"); // if (bmpTemperature != lastBmpTemp) { // gw.send(tempMsg.set(bmpTemperature,1)); // lastBmpTemp = bmpTemperature; // } int sensorValue = analogRead(BATTERY_SENSE_PIN); // Battery monitoring reading // Serial.println(sensorValue); float Vbat = sensorValue * VBAT_PER_BITS; // Serial.print("Battery Voltage: "); Serial.print(Vbat); Serial.println(" V"); //int batteryPcnt = sensorValue / 10; int batteryPcnt = static_cast<int>(((Vbat-VMIN)/(VMAX-VMIN))*100.); // Serial.print("Battery percent: "); Serial.print(batteryPcnt); Serial.println(" %"); if (oldBatteryPcnt != batteryPcnt) { gw.sendBatteryLevel(batteryPcnt); oldBatteryPcnt = batteryPcnt; } gw.sleep(SLEEP_TIME); //sleep a bit } -
Hi!
This is also what im trying to do... have the same components/material as you and added the resistors for battery measurement. I dont get this long life (sleeps 15min, activated and sends).Can you post some sort of schematics or more detailed pictures so i can see your connections?
Would be great!
Here is my own try for a schematics:
http://forum.mysensors.org/uploads/upload-5ed3f6ed-2d8c-4e6e-83bf-407973550c49.jpg -
A tip for much better batterylife: burn a new bootloader for 1mhz. Now you can attach the arduino and nrf directly to the batteries and you can measure the battery with the Internal voltage meter of the 328p. If you use a dht you attach the step-up conv. And only attach the dht to it.
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Hi!
This is also what im trying to do... have the same components/material as you and added the resistors for battery measurement. I dont get this long life (sleeps 15min, activated and sends).Can you post some sort of schematics or more detailed pictures so i can see your connections?
Would be great!
Here is my own try for a schematics:
http://forum.mysensors.org/uploads/upload-5ed3f6ed-2d8c-4e6e-83bf-407973550c49.jpg@sundberg84
I've looked at your lovely drawing before and I don't see anything wrong with it except from that 0.1uF capacitor should be in parallell just with the 470k resistor, but it shouldn't matter regarding battery life time. What would be more interesting is to see your sketch. Or do you use the same as I do?A schematic and a few better pictures is on my to do list, but will probably come sooner now since you asked for it.
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@m26872
Pretty much the same, i have stolen majority of your code:
Ive a array to get an average battery value each hour:#include <SPI.h> #include <MySensor.h> #include <DHT.h> //ställ in varje gång!========================= #define SketchName "Sovrum Uppe" #define SketchVer "1.0" #define NodeID 2 #define VBAT_PER_BITS 0.003363075 // Calculated volts per bit from the used battery montoring voltage divider. Internal_ref=1.1V, res=10bit=2^10-1=1023, Eg for 3V (2AA): Vin/Vb=R1/(R1+R2)=470e3/(1e6+470e3), Vlim=Vb/Vin*1.1=3.44V, Volts per bit = Vlim/1023= 0.003363075 #define VMIN 1.9 // Battery monitor lower level. Vmin_radio=1.9V #define VMAX 3.3 // " " " high level. Vmin<Vmax<=3.44 #define CHILD_ID_HUM 0 #define CHILD_ID_TEMP 1 #define HUMIDITY_SENSOR_DIGITAL_PIN 3 int BATTERY_SENSE_PIN = A0; // select the input pin for the battery sense point unsigned long SLEEP_TIME = 15*60000; //unsigned long SLEEP_TIME = 5000; //debug //Ställ även in gw.begin(,,,) //ställ in varje gång!========================= float lastTemp; float lastHum; boolean metric = true; int batteryPcnt = 0; int batLoop = 0; int batArray[3]; MySensor gw; DHT dht; MyMessage msgHum(CHILD_ID_HUM, V_HUM); MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP); void setup() { // use the 1.1 V internal reference analogReference(INTERNAL); delay(500); // Allow time for radio if power used as reset <<<<<<<<<<<<<< Experimented with good result gw.begin(NULL, NodeID, false); //incomingMessageCallback - Callback function for incoming messages from other nodes or controller and request responses. Default is NULL. //nodeId - The unique id (1-254) for this sensor. Default is AUTO(255) which means sensor tries to fetch an id from controller. //repeaterMode - Activate repeater mode. This node will forward messages to other nodes in the radio network. Make sure to call process() regularly. Default in false dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN); // Send the Sketch Version Information to the Gateway gw.sendSketchInfo(SketchName, SketchVer); // 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); metric = gw.getConfig().isMetric; } void loop() { int sensorValue = analogRead(BATTERY_SENSE_PIN); // Battery monitoring reading delay(1000); delay(dht.getMinimumSamplingPeriod()); float temperature = dht.getTemperature(); Serial.print("Temp: "); Serial.print(temperature); Serial.println(" C"); if (temperature > 0) { gw.send(msgTemp.set(temperature, 1)); } delay(1000); float humidity = dht.getHumidity(); Serial.print("Hum: "); Serial.print(humidity); Serial.println(" %"); if (humidity > 0) { gw.send(msgHum.set(humidity, 1)); } delay(1000); float Vbat = sensorValue * VBAT_PER_BITS; int batteryPcnt = static_cast<int>(((Vbat-VMIN)/(VMAX-VMIN))*100.); Serial.print("Battery percent: "); Serial.print(batteryPcnt); Serial.println(" %"); batArray[batLoop] = batteryPcnt; if (batLoop > 2) { batteryPcnt = (batArray[0] + batArray[1] + batArray[2] + batArray[3]); batteryPcnt = batteryPcnt / 4; Serial.print("Battery percent (Avg (4):) "); Serial.print(batteryPcnt); Serial.println(" %"); gw.sendBatteryLevel(batteryPcnt); batLoop = 0; } else { batLoop = batLoop + 1; } gw.sleep(SLEEP_TIME); //sleep a bit } -
A tip for much better batterylife: burn a new bootloader for 1mhz. Now you can attach the arduino and nrf directly to the batteries and you can measure the battery with the Internal voltage meter of the 328p. If you use a dht you attach the step-up conv. And only attach the dht to it.
@Sweebee
It's already been discussed earlier in this thread (see EasyIoTs posts above), it's nevertheless a very good tip. I also have some test nodes running, but I consider it to be the next step from the "basic" design which was this threads concept. If I'll post something with this low-power-tweaked design it'll therefore be in a new thread. I should probably write something about this as an update in the first post... -
@m26872
Pretty much the same, i have stolen majority of your code:
Ive a array to get an average battery value each hour:#include <SPI.h> #include <MySensor.h> #include <DHT.h> //ställ in varje gång!========================= #define SketchName "Sovrum Uppe" #define SketchVer "1.0" #define NodeID 2 #define VBAT_PER_BITS 0.003363075 // Calculated volts per bit from the used battery montoring voltage divider. Internal_ref=1.1V, res=10bit=2^10-1=1023, Eg for 3V (2AA): Vin/Vb=R1/(R1+R2)=470e3/(1e6+470e3), Vlim=Vb/Vin*1.1=3.44V, Volts per bit = Vlim/1023= 0.003363075 #define VMIN 1.9 // Battery monitor lower level. Vmin_radio=1.9V #define VMAX 3.3 // " " " high level. Vmin<Vmax<=3.44 #define CHILD_ID_HUM 0 #define CHILD_ID_TEMP 1 #define HUMIDITY_SENSOR_DIGITAL_PIN 3 int BATTERY_SENSE_PIN = A0; // select the input pin for the battery sense point unsigned long SLEEP_TIME = 15*60000; //unsigned long SLEEP_TIME = 5000; //debug //Ställ även in gw.begin(,,,) //ställ in varje gång!========================= float lastTemp; float lastHum; boolean metric = true; int batteryPcnt = 0; int batLoop = 0; int batArray[3]; MySensor gw; DHT dht; MyMessage msgHum(CHILD_ID_HUM, V_HUM); MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP); void setup() { // use the 1.1 V internal reference analogReference(INTERNAL); delay(500); // Allow time for radio if power used as reset <<<<<<<<<<<<<< Experimented with good result gw.begin(NULL, NodeID, false); //incomingMessageCallback - Callback function for incoming messages from other nodes or controller and request responses. Default is NULL. //nodeId - The unique id (1-254) for this sensor. Default is AUTO(255) which means sensor tries to fetch an id from controller. //repeaterMode - Activate repeater mode. This node will forward messages to other nodes in the radio network. Make sure to call process() regularly. Default in false dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN); // Send the Sketch Version Information to the Gateway gw.sendSketchInfo(SketchName, SketchVer); // 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); metric = gw.getConfig().isMetric; } void loop() { int sensorValue = analogRead(BATTERY_SENSE_PIN); // Battery monitoring reading delay(1000); delay(dht.getMinimumSamplingPeriod()); float temperature = dht.getTemperature(); Serial.print("Temp: "); Serial.print(temperature); Serial.println(" C"); if (temperature > 0) { gw.send(msgTemp.set(temperature, 1)); } delay(1000); float humidity = dht.getHumidity(); Serial.print("Hum: "); Serial.print(humidity); Serial.println(" %"); if (humidity > 0) { gw.send(msgHum.set(humidity, 1)); } delay(1000); float Vbat = sensorValue * VBAT_PER_BITS; int batteryPcnt = static_cast<int>(((Vbat-VMIN)/(VMAX-VMIN))*100.); Serial.print("Battery percent: "); Serial.print(batteryPcnt); Serial.println(" %"); batArray[batLoop] = batteryPcnt; if (batLoop > 2) { batteryPcnt = (batArray[0] + batArray[1] + batArray[2] + batArray[3]); batteryPcnt = batteryPcnt / 4; Serial.print("Battery percent (Avg (4):) "); Serial.print(batteryPcnt); Serial.println(" %"); gw.sendBatteryLevel(batteryPcnt); batLoop = 0; } else { batLoop = batLoop + 1; } gw.sleep(SLEEP_TIME); //sleep a bit }@sundberg84
I'm no code expert, and the only thing I can think of is that your "delay(1000)" will keep the power hungry radio awake. If you need delays (apart from debug) I'd prefer sleep instead. What's your battery life time look like? -
UPDATE
I've updated the first post with- A wiring layout.
- Added a text about the low-power option
- A few minor details.
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Great layout/way to show your project - really nice!
Its exactly as I do it so im getting a bit jealus here... . One node is down after a week.
It might be the hardware or me not so good soldering so i short something out.I will try some more nodes now you have comfirmed I do it the right way and that should work.
@m26872
Thank you!Controller: Proxmox VM - Home Assistant
MySensors GW: Arduino Uno - W5100 Ethernet, Gw Shield Nrf24l01+ 2,4Ghz
MySensors GW: Arduino Uno - Gw Shield RFM69, 433mhz
RFLink GW - Arduino Mega + RFLink Shield, 433mhz -
Great layout/way to show your project - really nice!
Its exactly as I do it so im getting a bit jealus here... . One node is down after a week.
It might be the hardware or me not so good soldering so i short something out.I will try some more nodes now you have comfirmed I do it the right way and that should work.
@m26872
Thank you!@sundberg84
Thx, good you liked it.
With such fast battery drain it should be easier to trace the current draw. First you'll need to measure the current. Second option is of course the good old switch-and-replace troubleshooting method.
I've read about hardware and quality issues, but let's hope it isn't... -
@m26872 What kind of pro-mini do you use?
Im using deek robot 3.3v 8mhz and it seems like there is a problem with this: (http://forum.mysensors.org/topic/230/power-conservation-with-battery-powered-sensors) i kill them when i try to remove voltage regulator so i guess i havent suceeded yet with that.I dont have any good equipment to measure current... Ill have made a new sensor today - lets see how it operates.
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Here are some close-up pictures of my Node 105 (which I opened with maximum care not to spoil my long term testing)
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The news is that my Vera Lite gave up (soft-wise) after all hacking, plug-ins and un-clean factory resets, so I gave up on her (and Z-wave too, at least for a while). We've been fighting with each other for too long, so I'd say the divorce was welcome.
Instead, in the controller jungle I decided to try Fhem, aware of the challanges as I'm not German- (nor Perl) speaking. I'm still in the sens-but-no-control-phase and have a few test nodes running, including "the" node 105. (Very easy transition btw, just one press at reset button then a node is in production with a new controller.)
Back home today after 2w holiday I think it's looking good. The only problem now is of course that my trending is broken. If anyone knows how to merge the old trend data with the new, you're very welcome? Or just on how to rescue the Datamine data (from NAS)? If possible? I haven't researched anything yet.
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Just an idea... I'm not sure if someone mentioned it:
If sending consumes so much power... what about collecting sensor data every 5 minutes and then send the data (array) once per hour? Of course there would be some time calculating before logging in the controller (fhem), but this way, I can save power... What do you think? -
Just an idea... I'm not sure if someone mentioned it:
If sending consumes so much power... what about collecting sensor data every 5 minutes and then send the data (array) once per hour? Of course there would be some time calculating before logging in the controller (fhem), but this way, I can save power... What do you think?@Meister_Petz Kind of what I already do in the test nodes 105/106 if you look at code above. Update frequencey and battery life time is a balance that can be adjusted just as you wish. Right now these node send update every 15 min and take sample for calculation 5 min before, which is about what I need. If you and your application is more interested in trending, history and data collection, I think your suggestion is excellent. If you need a fast response or action from your automation system it's not.
But, what I think is most unneseccary with my test nodes 105/106 is that they check battery level every 15 min and send update if it has changed. Since the level typically is unstable right after the first transmission, it will generate a lot of useless transmissions. The only reason for me not to update code in node 105/106 is to keep it as an untouched study case. In my new nodes I usually set a fixed battery check/update frequency (1/week) which also works as a heartbeat signal for less active nodes.
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Not sure if any one has had the same question. But the other day I stumbled on this little thing ;)
https://www.adafruit.com/product/1572 It's a really small rechargeable battery. Now I don't no much about batteries. But I know that my LiOn powerd handdrill is very strong. The batteries of my handdril hardly lose power over time.So I was wondering if this could be used to power an Arduino and some sensors and how long it will take for the battery te become empty. It would make my 3.3V Sensors really small. I could almost install them in a small matchbox. Which I think is really cool!
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Not sure if any one has had the same question. But the other day I stumbled on this little thing ;)
https://www.adafruit.com/product/1572 It's a really small rechargeable battery. Now I don't no much about batteries. But I know that my LiOn powerd handdrill is very strong. The batteries of my handdril hardly lose power over time.So I was wondering if this could be used to power an Arduino and some sensors and how long it will take for the battery te become empty. It would make my 3.3V Sensors really small. I could almost install them in a small matchbox. Which I think is really cool!
