BUZZER

// Buzzer — Tone / Melody Player
// Plays the opening notes of "Twinkle Twinkle Little Star" on the piezo buzzer.

const int BUZZER_PIN = 8;

// Note frequencies (Hz)
const int NOTE_C4 = 262;
const int NOTE_D4 = 294;
const int NOTE_E4 = 330;
const int NOTE_F4 = 349;
const int NOTE_G4 = 392;
const int NOTE_A4 = 440;

int melody[] = {
  NOTE_C4, NOTE_C4, NOTE_G4, NOTE_G4,
  NOTE_A4, NOTE_A4, NOTE_G4,
};
int durations[] = {
  400, 400, 400, 400,
  400, 400, 800,
};

void setup() {
  Serial.begin(9600);
  Serial.println("Playing melody...");
}

void loop() {
  for (int i = 0; i < 7; i++) {
    tone(BUZZER_PIN, melody[i], durations[i]);
    delay(durations[i] * 1.3); // pause between notes
  }
  noTone(BUZZER_PIN);
  delay(2000); // wait, then repeat
}