#define BUZZER_PIN 8
#define BUTTON_PIN 2

void setup() {
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP); // use internal pull-up
}

void loop() {
  if (digitalRead(BUTTON_PIN) == LOW) { // button pressed
    tone(BUZZER_PIN, 1000);              // 1000 Hz tone
  } else {
    noTone(BUZZER_PIN);                  // buzzer off
  }
}