int pir = 12;
int buzzer = 11;

void setup() {
  // put your setup code here, to run once:
  pinMode(pir, INPUT);
  pinMode(buzzer, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  int value_of_pir = digitalRead(pir);

  if(value_of_pir == HIGH){
    tone(buzzer, 500, 3);
  }

  else{
    tone(buzzer, 0, 1);
  }

}