Arduino: PIR Sensor Demo Sketch

// PIR Demo Sketch

const int OPin = 7;     // Pin 7 is OUTPUT
const int IPin = 2;     // Pin 2 is INPUT

int i;                  // state of sensor

void setup()
{
  pinMode(OPin,OUTPUT);     // initialises digital pins for
  pinMode(IPin,INPUT);      // output & input
}

void loop()
{
  i = digitalRead(IPin);    // checks for movement on Pin 2

  if (i==1)         // movement detected, state = 1
  {
    digitalWrite(OPin,HIGH);    // turns on LED on Pin 7 when detected
  }

else

  {
    digitalWrite(OPin,LOW); // turns off LED on Pin 7 when no movement
  }             // is detected
}

// <EOF>