data-pirates.org

 // example for the PIR motion sensor SE-10
 
  int timer = 500;
  int alarmPin = 0;
  int alarmValue = 0;
  int ledPin = 5;
 
  void setup () {
  Serial.begin (9600);
  pinMode(ledPin, OUTPUT);  
  pinMode(alarmPin, INPUT);
  delay (2000); // it takes the sensor 2 seconds to scan the area around it before it can 
 
  }
 
  void loop (){
  alarmValue = analogRead(alarmPin);
 
  if (alarmValue < 100){
   blinky(); // blinks when the motion has been detected, just for confirmation.
  }
  delay(timer);
 
  Serial.println (alarmValue);
 
  delay (10);
 
  }
 
  void blinky() {
   for(int i=0; i<3; i++) {
     digitalWrite(ledPin,HIGH);
     delay(200);
     digitalWrite(ledPin,LOW);
     delay(200);
   }
  }