3 in 1 incl battery monitor

[the cosmic gate]

So the code "must" be

#include <SPI.h>
#include <MySensor.h>  
#include <DHT.h>  

int BATTERY_SENSE_PIN = A0;  // select the input pin for the battery sense point

#define CHILD_ID_HUM 0
#define CHILD_ID_TEMP 1
#define CHILD_ID_MOT 2   // Id of the sensor child
#define HUMIDITY_SENSOR_DIGITAL_PIN 4

#define DIGITAL_INPUT_SENSOR 3   // The digital input you attached your motion sensor.  (Only 2 and 3 generates interrupt!)
#define INTERRUPT DIGITAL_INPUT_SENSOR-2 // Usually the interrupt = pin -2 (on uno/nano anyway)


unsigned long SLEEP_TIME = 30000; // Sleep time between reads (in milliseconds)
int oldBatteryPcnt = 0;

MySensor gw;
DHT dht;
float lastTemp;
float lastHum;
boolean metric = true; 
MyMessage msgHum(CHILD_ID_HUM, V_HUM);
MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);
MyMessage msgMot(CHILD_ID_MOT, V_TRIPPED);

void setup()  
{ 
   // use the 1.1 V internal reference
#if defined(__AVR_ATmega2560__)
   analogReference(INTERNAL1V1);
#else
   analogReference(INTERNAL);
#endif
  gw.begin();
  dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN); 



 pinMode(DIGITAL_INPUT_SENSOR, INPUT);      // sets the motion sensor digital pin as input
 
  // 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_MOT, S_MOTION);
   
  metric = gw.getConfig().isMetric;
}

void loop()      

{  
  // get the battery Voltage
   int sensorValue = analogRead(BATTERY_SENSE_PIN);
   #ifdef 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
   float batteryV  = sensorValue * 0.003363075;
   int batteryPcnt = sensorValue / 10;

   #ifdef DEBUG
   Serial.print("Battery Voltage: ");
   Serial.print(batteryV);
   Serial.println(" V");

   Serial.print("Battery percent: ");
   Serial.print(batteryPcnt);
   Serial.println(" %");
   #endif

   if (oldBatteryPcnt != batteryPcnt) {
     
     
   }
     
     
  // Read digital motion value
  boolean tripped = digitalRead(DIGITAL_INPUT_SENSOR) == HIGH; 
        
  Serial.println(tripped);
 
  
  delay(dht.getMinimumSamplingPeriod());

  float temperature = dht.getTemperature();
  if (isnan(temperature)) {
      Serial.println("Failed reading temperature from DHT");
  } else if (temperature != lastTemp) {
    lastTemp = temperature;
    if (!metric) {
      temperature = dht.toFahrenheit(temperature);
    }
    Serial.print("T: ");
    Serial.println(temperature);
  }
  
  float humidity = dht.getHumidity();
  if (isnan(humidity)) {
      Serial.println("Failed reading humidity from DHT");
  } else if (humidity != lastHum) {
      lastHum = humidity;
      gw.send(msgHum.set(humidity, 1));
      gw.send(msgMot.set(tripped?"1":"0"));
      gw.sendSketchInfo("Humidity/Motion", "1.0");
      gw.sendBatteryLevel(batteryPcnt);
      oldBatteryPcnt = batteryPcnt;
      Serial.print("H: ");
      Serial.println(humidity);
      gw.send(msgTemp.set(temperature, 1));
  }

  
 
  // Sleep until interrupt comes in on motion sensor. Send update every two minute. 
  gw.sleep(INTERRUPT,CHANGE, SLEEP_TIME);
}

[sundberg84]

Dont know if im answring the question (or i understand it)...
Do you mean @AWI that if you put the gw.*** together?

gw.begin();
  dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN); 
 pinMode(DIGITAL_INPUT_SENSOR, INPUT);      // sets the motion sensor digital pin as input
 
  // 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_MOT, S_MOTION);

put all the gw. *** together it will not cause the radio be on during DHT setup and readings like:

dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN); 
 pinMode(DIGITAL_INPUT_SENSOR, INPUT);      // sets the motion sensor digital pin as input

gw.begin(); 
  // 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_MOT, S_MOTION);

[the cosmic gate]

@sundberg84 said:

Dont know if im answring the question (or i understand it)...
Do you mean @AWI that if you put the gw.*** together?

gw.begin();
  dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN); 
 pinMode(DIGITAL_INPUT_SENSOR, INPUT);      // sets the motion sensor digital pin as input
 
  // 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_MOT, S_MOTION);

put all the gw. *** together it will not cause the radio be on during DHT setup and readings like:

dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN); 
 pinMode(DIGITAL_INPUT_SENSOR, INPUT);      // sets the motion sensor digital pin as input

gw.begin(); 
  // 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_MOT, S_MOTION);

Now I'am getting confused :)

The thing i want to do is to make this 3in1 sketch , an 4 in 1 where the 4th is the battery sensors.
When i copy and paste this sketches together, i want to arrange one sketch who can run als long as possible on 2xAA batteries.
So if there are some tricks to make this sketch more battery friendle, so it runs longer on this 2 AA then it try to arrange is.
So As @AWI said i'll removed all the gw.send instructions, which gives me the result that the mysensors function is gone.
Then i tried again and put all the gw.send instructions "together".
But when i read you're reactien @sundberg84 this is not okay, or are there even more options to combine rules to make the sketch more battery friendly ?

Thnx for all the input

[AWI]

@the-cosmic-gate The reason to group all the "gw.send" instructions together (at the end of the sketch) is that the radio can "sleep" during the temperature and humidity readings. There are many ways (other than HW) to save battery power, like: only send values when a certain threshold is exceeded, decrease update frequency etc.

Just an example for a sensor which uses 11 uA in idle and sends updates only when needed (including a once in a hour 'heartbeat' of all sensors).

/*
 PROJECT: MySensors / Small battery sensor low power 1 mhz
 PROGRAMMER: AWI
 DATE: november 4, 2015/ last update: december 4, 2015
 FILE: AWI small THM.ino
 LICENSE: Public domain

 Hardware: ATMega328p board w/ NRF24l01
	and MySensors 1.6 (Development)
		
Special:
	program with Arduino Pro 3.3V 1Mhz!!!
	
Summary:
	low power (battery)
	HTU21 Temp/Hum & Motion (interrupt)
	voltage meter for battery (internal)

Remarks:
	Fixed node-id
	
Change log:
20151204 - made it universal with respect to node id, only change   first 2 lines
*/

// Enable debug prints to serial monitor
#define MY_NODE_ID 19
#define NODE_TXT "THM 19"							// Text to add to sensor name

#define MY_DEBUG 
#define MY_RADIO_NRF24								// Enable and select radio type attached

#include <SPI.h>
#include <MySensor.h>
#include <Wire.h> 									// I2C
#include <HTU21D.h>            						// temperature / humidity (i2c, HTU21D, SHT21)
#include <Vcc.h>									// library for internal reference Vcc reading

#undef MY_DEBUG										// turns of MySensors Serial debug (default on)

// Reference values for ADC and Battery measurements
const float VccMin        	= 1.0*2.5 ;    			// Minimum expected Vcc level, in Volts. Example for 1 rechargeable lithium-ion.
const float VccMax       	= 1.0*3.0 ;    			// Maximum expected Vcc level, in Volts. 
//const float VccMin        = 2.0*0.6 ;  			// Minimum expected Vcc level, in Volts. for 2xAA Alkaline.
//const float VccMax        = 2.0*1.5 ;  			// Maximum expected Vcc level, in Volts.for 2xAA Alkaline.
const float VccCorrection 	= 3.30/3.42 ;			// Measured Vcc by multimeter divided by reported Vcc
Vcc vcc(VccCorrection); 							// instantiate internal voltage measurement lib

const float tempThreshold = 0.02 ; 					// send only if change > treshold (Celcius)
const float humThreshold = 0.05 ; 					// send only if change > treshold (% RG)
const float voltageThreshold = 0.01 ; 				// send only if change > treshold (Volt)

#define MOTION_CHILD_ID 		1
#define TEMP_CHILD_ID 			3
#define HUM_CHILD_ID 			4
#define VOLTAGE_CHILD_ID 		7

#define DIGITAL_INPUT_SENSOR 	3  					// motion sensor.  (Only 2 and 3 generates interrupt!)
#define INTERRUPT DIGITAL_INPUT_SENSOR-2 			// Usually the interrupt = pin -2 

HTU21D SHT21;										// Hum/Temp (SHT12)

const unsigned long SLEEP_TIME = 60000UL;			// 60 sec sleep time between reads (seconds * 1000 milliseconds)
const int heartbeat = 60 ;							// heartbeat every hour (x times SLEEP_TIME)
unsigned long lastHeartbeat = 0 ; 
float lastHumidity = 0 ;
float lastTemperature = 0 ;
float lastVoltage = 0 ;
boolean lastTripped = false ;
// flags to indicate if transmission is needed, heartbeat and/or changes > treshold
boolean txHumidity = true ;							// flags to indicate if transmit is needed (time & change driven)
boolean txTemperature = true ;
boolean txVoltage = true ;
boolean txTripped = true ;

// standard messages
MyMessage temperatureMsg(TEMP_CHILD_ID, V_TEMP);	// SHT temp
MyMessage humidityMsg(HUM_CHILD_ID, V_HUM);			// SHT hum
MyMessage voltageMsg(VOLTAGE_CHILD_ID, V_VOLTAGE);	// Node voltage
MyMessage motionMsg(MOTION_CHILD_ID, V_TRIPPED);	// Motion/ door contact

void setup()  
{
	analogReference(INTERNAL);						// use the 1.1 V internal reference for voltage measurement
	//begin(NULL, nodeId);  						// fixed node 
	Serial.begin(9600);								// reset baud rate for 1 mhz clock rate
    // Send the sketch version information to the gateway and Controller
	sendSketchInfo("AWI small " NODE_TXT, "1.0");
	present(TEMP_CHILD_ID, S_TEMP, "Temperature SHT " NODE_TXT);
	present(HUM_CHILD_ID, S_HUM, "Humidity SHT " NODE_TXT);
	present(VOLTAGE_CHILD_ID, S_MULTIMETER, "Battery " NODE_TXT);
	present(MOTION_CHILD_ID, S_MOTION, "Motion " NODE_TXT);

	pinMode(DIGITAL_INPUT_SENSOR, INPUT);      		// sets the motion sensor digital pin as input
   
	Wire.begin();									// init I2C
	SHT21.begin();									// initialize temp/hum
}

void loop()
{
	// first read all sensors before possible transmission (save battery)
    readTempHum(); 
	// Read digital motion value
	boolean tripped = false ;//digitalRead(DIGITAL_INPUT_SENSOR) == HIGH;     
	if (lastTripped != tripped){
		lastTripped = tripped ;
		txTripped = true ;
		}
	// read battery Voltage
    float voltage = vcc.Read_Volts() ;
	if ( abs(voltage - lastVoltage) >= voltageThreshold ){ // update only if threshold exceeded
		lastVoltage = voltage ;
		txVoltage = true ;
		} 
	sendSensors() ;											// send sensors (== radio) at the end 
	sleep(INTERRUPT, CHANGE , SLEEP_TIME );					// sleep and wait for time and motion
}

void readTempHum(void)
{
    // SHT2x sensor
	// Temperature and Humidity
	float humidity = SHT21.readHumidity();
	float temperature = SHT21.readTemperature();			// save battery by sending changes only & reading SHT first (>50ms)
	if ( abs(humidity  - lastHumidity) >= humThreshold ){	// update only if threshold exceeded
		lastHumidity = humidity ;
		txHumidity = true ;
		} 
	if ( abs(temperature - lastTemperature) >= tempThreshold ){ 
		lastTemperature = temperature ;
		txTemperature = true ;
		} 
	// Serial.print("SHT_ temp: ");
	// Serial.print(temperatureSHT);
	// Serial.print(" SHT_ hum: ");
	// Serial.println(humidity);
}

// send to gateway depending on tx.. settings
void sendSensors()
{
	lastHeartbeat++ ;										// update Heartbeatcount every call
	if ( lastHeartbeat > heartbeat) {						// if heartbeat update all sensors & battery status
		txTemperature = txHumidity = txVoltage = true ;
	    sendBatteryLevel(vcc.Read_Perc(VccMin, VccMax, true));
		lastHeartbeat = 0 ;
		}
	if (txTemperature){
		send(temperatureMsg.set(lastTemperature, 2));		// Send in deg C
		txTemperature = false ;
		}
	if (txHumidity){
		send(humidityMsg.set(lastHumidity, 2));  			// Send in %RH
		txHumidity = false ;
		}
	if (txVoltage){
		send(voltageMsg.set(lastVoltage,2));				//send battery in Volt 
		txVoltage = false ;
		}
	if (txTripped){
		send(motionMsg.set(lastTripped?"1":"0"));  			// Send tripped value to gw 
		txTripped = false ;
		}
}

[the cosmic gate]

I'am not getting this clear / working :(
Could somebody help me to complete this 3in1 incl battery monitoring sketch working? Thnx

[sundberg84]

What does your serial or error log tell you when you upload the sketch you have? And which sketch/code do you use at this point?

[AWI]

@the-cosmic-gate

I changed your original sketch a little. It now includes a conditional send for the "tripped" values and groups the conditional sends for all values.

I was not able to test as I'm using a different library for the DHT.

Have fun..

#include <SPI.h>
#include <MySensor.h>  
#include <DHT.h>  

int BATTERY_SENSE_PIN = A0;  // select the input pin for the battery sense point

#define CHILD_ID_HUM 0
#define CHILD_ID_TEMP 1
#define CHILD_ID_MOT 2   // Id of the sensor child

#define HUMIDITY_SENSOR_DIGITAL_PIN 4
#define DIGITAL_INPUT_SENSOR 3   // The digital input you attached your motion sensor.  (Only 2 and 3 generates interrupt!)
#define INTERRUPT DIGITAL_INPUT_SENSOR-2 // Usually the interrupt = pin -2 (on uno/nano anyway)

unsigned long SLEEP_TIME = 30000UL; // Sleep time between reads (in milliseconds)
int oldBatteryPcnt = 0;

MySensor gw;
DHT dht;
float lastTemp = 0 ;
float lastHum = 0 ;
boolean lastTripped = false ;
boolean metric = true; 
MyMessage msgHum(CHILD_ID_HUM, V_HUM);
MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);
MyMessage msgMot(CHILD_ID_MOT, V_TRIPPED);

void setup()  
{ 
   // use the 1.1 V internal reference
#if defined(__AVR_ATmega2560__)
   analogReference(INTERNAL1V1);
#else
   analogReference(INTERNAL);
#endif
  gw.begin();
  dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN. DHT22); 

  // Send the Sketch Version Information to the Gateway
  gw.sendSketchInfo("Humidity/Motion", "1.0");


 pinMode(DIGITAL_INPUT_SENSOR, INPUT);      // sets the motion sensor digital pin as input
 
  // 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_MOT, S_MOTION);
   
  metric = gw.getConfig().isMetric;
}

void loop()      

{  
  // get the battery Voltage
   int sensorValue = analogRead(BATTERY_SENSE_PIN);
   #ifdef 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
   float batteryV  = sensorValue * 0.003363075;
   int batteryPcnt = sensorValue / 10;

   #ifdef DEBUG
   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
     gw.sendBatteryLevel(batteryPcnt);
     oldBatteryPcnt = batteryPcnt;
   }
     
     
  // Read digital motion value
  boolean tripped = digitalRead(DIGITAL_INPUT_SENSOR) == HIGH; 
  
  if (tripped != lastTripped ) {      
  	Serial.println(tripped);
  	gw.send(msgMot.set(tripped?"1":"0"));  // Send tripped value to gw 
  }
  delay(dht.getMinimumSamplingPeriod());

  float temperature = dht.getTemperature();
  float humidity = dht.getHumidity();
  
  if (isnan(temperature)) {
      Serial.println("Failed reading temperature from DHT");
  } else if (temperature != lastTemp) {
    lastTemp = temperature;
    if (!metric) {
      temperature = dht.toFahrenheit(temperature);
    }
    gw.send(msgTemp.set(temperature, 1));
    Serial.print("T: ");
    Serial.println(temperature);
  }
  
  if (isnan(humidity)) {
      Serial.println("Failed reading humidity from DHT");
  } else if (humidity != lastHum) {
      lastHum = humidity;
      gw.send(msgHum.set(humidity, 1));
      Serial.print("H: ");
      Serial.println(humidity);
  }

   if (oldBatteryPcnt != batteryPcnt) {
     // Power up radio after sleep
     gw.sendBatteryLevel(batteryPcnt);
     oldBatteryPcnt = batteryPcnt;
   }
  
 
  // Sleep until interrupt comes in on motion sensor. Send update every two minute. 
  gw.sleep(INTERRUPT,CHANGE, SLEEP_TIME);
}

[the cosmic gate]

Thnx a lot @AWI
there was 1 verification error,

dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN. DHT22); 

changed it, to :

#include <SPI.h>
#include <MySensor.h>  
#include <DHT.h>  

int BATTERY_SENSE_PIN = A0;  // select the input pin for the battery sense point

#define CHILD_ID_HUM 0
#define CHILD_ID_TEMP 1
#define CHILD_ID_MOT 2   // Id of the sensor child

#define HUMIDITY_SENSOR_DIGITAL_PIN 4
#define DIGITAL_INPUT_SENSOR 3   // The digital input you attached your motion sensor.  (Only 2 and 3 generates interrupt!)
#define INTERRUPT DIGITAL_INPUT_SENSOR-2 // Usually the interrupt = pin -2 (on uno/nano anyway)

unsigned long SLEEP_TIME = 30000UL; // Sleep time between reads (in milliseconds)
int oldBatteryPcnt = 0;

MySensor gw;
DHT dht;
float lastTemp = 0 ;
float lastHum = 0 ;
boolean lastTripped = false ;
boolean metric = true; 
MyMessage msgHum(CHILD_ID_HUM, V_HUM);
MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);
MyMessage msgMot(CHILD_ID_MOT, V_TRIPPED);

void setup()  
{ 
   // use the 1.1 V internal reference
#if defined(__AVR_ATmega2560__)
   analogReference(INTERNAL1V1);
#else
   analogReference(INTERNAL);
#endif
  gw.begin();
  dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN); 

  // Send the Sketch Version Information to the Gateway
  gw.sendSketchInfo("Humidity/Motion", "1.0");


 pinMode(DIGITAL_INPUT_SENSOR, INPUT);      // sets the motion sensor digital pin as input
 
  // 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_MOT, S_MOTION);
   
  metric = gw.getConfig().isMetric;
}

void loop()      

{  
  // get the battery Voltage
   int sensorValue = analogRead(BATTERY_SENSE_PIN);
   #ifdef 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
   float batteryV  = sensorValue * 0.003363075;
   int batteryPcnt = sensorValue / 10;

   #ifdef DEBUG
   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
     gw.sendBatteryLevel(batteryPcnt);
     oldBatteryPcnt = batteryPcnt;
   }
     
     
  // Read digital motion value
  boolean tripped = digitalRead(DIGITAL_INPUT_SENSOR) == HIGH; 
  
  if (tripped != lastTripped ) {      
    Serial.println(tripped);
    gw.send(msgMot.set(tripped?"1":"0"));  // Send tripped value to gw 
  }
  delay(dht.getMinimumSamplingPeriod());

  float temperature = dht.getTemperature();
  float humidity = dht.getHumidity();
  
  if (isnan(temperature)) {
      Serial.println("Failed reading temperature from DHT");
  } else if (temperature != lastTemp) {
    lastTemp = temperature;
    if (!metric) {
      temperature = dht.toFahrenheit(temperature);
    }
    gw.send(msgTemp.set(temperature, 1));
    Serial.print("T: ");
    Serial.println(temperature);
  }
  
  if (isnan(humidity)) {
      Serial.println("Failed reading humidity from DHT");
  } else if (humidity != lastHum) {
      lastHum = humidity;
      gw.send(msgHum.set(humidity, 1));
      Serial.print("H: ");
      Serial.println(humidity);
  }

   if (oldBatteryPcnt != batteryPcnt) {
     // Power up radio after sleep
     gw.sendBatteryLevel(batteryPcnt);
     oldBatteryPcnt = batteryPcnt;
   }
  
 
  // Sleep until interrupt comes in on motion sensor. Send update every two minute. 
  gw.sleep(INTERRUPT,CHANGE, SLEEP_TIME);
}

uploading now

[the cosmic gate]

working nice for 2 day's now !
Thnx a lot @AWI !!!

[the cosmic gate]

Something strange: when I look in the IDE console the battery % is displayed. But using Domoticz there's no battery % display / selectable ? What's wrong , or do I forget something ?

[icebob]

In Domoticz you can see the battery level in Setup->Devices.

If you would like to see on a chart, you have to send the battery level or voltage to the controller as a sensor value too. After it, you can see as this:

[Tronix]

@icebob

Hi, I'm a newbee just started with MySensors. I built the first temp/hum sensor, and I'm trying to plot the battery level in a graph too. In this discussion you mention that I need to send the battery level to the controller as sensor value. Can you please share with me the code which I should use? Thanks a lot.

Marco

[icebob]

Yes, I can.

This is the definition of message for battery level:

// Battery sensor (A0)
#define CHILD_ID_BATTERY 199
#define BATTERY_SENSOR_ANALOG_PIN 0
MyMessage msgBattery(CHILD_ID_BATTERY, V_VOLTAGE);

And this is the sender function:

// 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
#define VBAT_PER_BITS 0.003363075
#define VMIN 1.9  // Battery monitor lower level. Vmin_radio=1.9V
#define VMAX 3.00  // Vmin<Vmax<=3.44
#define VCC_CORRECTION (3.4 / 3.33)
int lastBatteryLevel;

bool sendBatteryLevel(bool force = false) {
  int value = analogRead(BATTERY_SENSOR_ANALOG_PIN);

  float batVoltage  = value * VBAT_PER_BITS / VCC_CORRECTION;
  int batLevel = static_cast<int>(((batVoltage-VMIN)/(VMAX-VMIN))*100.);
  if (batLevel != lastBatteryLevel || force) {
    gw.sendBatteryLevel(batLevel);
    gw.send(msgBattery.set(batVoltage, 2));
    
    lastBatteryLevel = batLevel;
  }
  return true;
}```

[Tronix]

Great, thanks for your quick response. Implementing now. Looks good.

[the cosmic gate]

Running the sketch for 1 Monty (+-), and the AA batteries are dead empty ?
I did all the "possible" mods on the arduino ( cut the LED an V ) , what can i do to make this sketch run langer on this 2AA batteries ?
Something in the sketch , some fine tuning or something else ?
When read the arduino hardware tweaking topics on different forums they dat that running for 1 year ( and more) is possible but how ;-)?

[carlierd]

Hello,

Did you measured the current of your circuit ?
What motion sensor are you using ? This component may consume a lot of current. Did you check this post ?

If you wake-up the arduino every 30 seconds for measurement it's a problem. Every 5 minutes is the minimum I think. I have connected the Vcc pin of the DHT sensors and the Vcc of the LDR to a digital pin of the arduino and when a measurement is done I set the PIN to the HIGH state.

First measurement of my sensor gives an IDLE current consumption close to 5uA which is really correct according to elements connected to the arduino (RFM69HW, DHT22 and LDR).

David.

[bjacobse]

Yes as Carlierd writes, it's important that the Arduino are controlling the voltage to the external components, like DHT.
I might have overlooked, but which component are you using for motion sensing? maybe this component is also power-hungry

[icebob]

@the-cosmic-gate Now I measured my dev circuit (Arduino Nano from China (cutted power led and desoldered regulator) + DHT22 + PIR + Battery measure resistor divider) and in gw.sleep (with 1 interrupt for PIR) the power comsumption is ~90uA.

It wakes up every minutes, measuring and sending (~100ms and 5 - 20mA).
So 100ms with 20mA and 59900ms with 0.09mA. The average current is 120uA and with 2 AA battery it is about 2 years.

[ericvdb]

@icebob,
whats that app you are using to do the battery calculations?

[carlierd]

@icebob
100ms for measurement and transmission seems very small ! I am at approximately 1500ms.
Give me your secret now !! ;)