const int pinSensor = 12;
const int pinBuzzer = 8;


void setup() {
  Serial.begin(9600);
  pinMode(pinSensor, INPUT);
  pinMode(pinBuzzer, OUTPUT);
}

void loop() {
  if(digitalRead(pinSensor) == HIGH) {
    noTone(pinBuzzer);
  } else {
    noTone(pinBuzzer);
    delay(150);
    tone(pinBuzzer, 165);
    delay(150);
    tone(pinBuzzer, 131);
    delay(300);
  }
}