int pir=12;
int buzzpin=11;
void setup() {
  pinMode(pir, INPUT);
  pinMode(buzzpin, OUTPUT);
  // put your setup code here, to run once:

}

void loop() {
  int value_of_pir = digitalRead(pir);
  if(value_of_pir == HIGH)
  {
    tone(buzzpin,500,3);
  }
  else
  {
    tone(buzzpin,0,1);
  }
  // put your main code here, to run repeatedly:

}