int buttonPin = 15;
int buzzerPin = 13;
int buttonState = 0;

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  buttonState = digitalRead(buttonPin);
  if (buttonState == LOW) {
    tone(buzzerPin, 1000);   // play 1000Hz tone
  } else {
    noTone(buzzerPin);       // stop tone
  }
}