#define PIR 12
#define LED 2

void setup() {
  pinMode(PIR, INPUT);
  pinMode(LED, OUTPUT);
}

void loop() {
  if(digitalRead(PIR)==1)
  {
    //Turn on the LED when Motion detected
    digitalWrite(LED, HIGH);
  }
  else
  {
    //Turn off the LED when Motion detected
    digitalWrite(LED, LOW);
  }
  delay(10);
}