I will try tomorrow to do it without any voltage regulators together with a sensebender micro. I have the bigger pir sensor though, but I dont think its much difference on thoose. We will see.

@m26872 Hello, have you not used any voltage regultator for the pir sensor? You just give it direct connection to the batterypack?

Hello
It would be nice to make it run on batteries, maybe with 10 seconds sleep, and then wake up only to check with gateway if there is a new command and then sleep again.

I am building a pir sensor now based on 3*aa batteris running on 4,5 volt.I will ust use an LE33 step down directly after the battery pack to provide power to both sensebender+radio+pir. Dont know if that is the optimal way to do it but it should work

@ToniA
Hey, thanks for all the work you have put down. I have had some other projects going the last year so have not really put down more time on this.

How is it working with the sensebender? Are you using it on batteries?
Any ide about battery usage?

Wonderful!
Maybe I will try this design then. But I dont need them so small so will probably use the bigger PIR sensor in mine.
I will revert when I'm done

Hello
I am busy building an burglar alarm for my home.
Because of this its important its a wireless system (to not go down during electrical failure in the house).

I wonder is there any stable good PIR sensor that works with battery?
I have sourced the forum but not really found anything. I have a couple of Sensebender micro boads lying around that I would prefer to use for this.

Its off course also important that there is no false triggers, because then it would be a very unreliable system.

@AWI

Yes i am. but there is mistake in the picture the R3 is connected between Pin 3 and VCC, not ground (pull up resistor).

Then that leaves me hanging a bit because that is way more than I will be comfortable with in terms off battery changes.
Any suggestion what to do?

@awi

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

#define CHILD_ID_HUM 0
#define CHILD_ID_TEMP 1
#define CHILD_ID_SWITCH 2
#define BUTTON_PIN  3
#define HUMIDITY_SENSOR_DIGITAL_PIN 4
#define VBAT_PER_BITS 0.003363075 //(1mohm / 470 kohm)   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
int BATTERY_SENSE_PIN = A0;  // select the input pin for the battery sense point
unsigned long SLEEP_TIME = 60000; // Sleep time between reads (in milliseconds)

MySensor gw;
DHT dht;
float lastTemp;
float lastHum;
boolean metric = true; 
int oldBatteryPcnt = 0;
MyMessage msg(CHILD_ID_SWITCH,V_TRIPPED);
MyMessage msgHum(CHILD_ID_HUM, V_HUM);
MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);


void setup()  
{ 
  analogReference(INTERNAL);
  gw.begin();
  dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN); 

  // Send the Sketch Version Information to the Gateway
  gw.sendSketchInfo("Humidity", "1.0");
   // Setup the button
  pinMode(BUTTON_PIN,INPUT);
  // Activate internal pull-up
  digitalWrite(BUTTON_PIN,HIGH);

  // Register all sensors to gw (they will be created as child devices)
  gw.present(CHILD_ID_SWITCH, S_DOOR);
  gw.present(CHILD_ID_HUM, S_HUM);
  gw.present(CHILD_ID_TEMP, S_TEMP);
  
  metric = gw.getConfig().isMetric;
}



void loop()      
{  
    // Get the update value
  int value = digitalRead(BUTTON_PIN);
 
  // Send in the new value
  gw.send(msg.set(value==HIGH ? 1 : 0));
  
  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);
    }
    gw.send(msgTemp.set(temperature, 1));
    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));
      Serial.print("H: ");
      Serial.println(humidity);
  }
  
  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(BUTTON_PIN-2, CHANGE, SLEEP_TIME);
}

Hello again.
I just got some new 470k resistors today so i changed out the 10k/4,7k resistors on the battery circuit to 1mohm/470k
The current draw is now 0,63mA when sleeping and 17,6mA when sending.
Especially the sleeping current seem very high. Any ideas to why?

hmm think i solved the problem. I tried with an arduino uno instead and now the sketch works fine. Very strange