void setup() {
  pinMode(11, OUTPUT);
}

void loop() {
  playHappyBirthday();
}

void playHappyBirthday() {
  // "Happy Birthday" melody
  int melody[] = {
    262, 262, 294, 262, 349, 330,
    262, 262, 294, 262, 392, 349,
    262, 262, 523, 466, 349, 330, 294,
    466, 466, 440, 349, 392, 349
  };

  int noteDurations[] = {
    4, 4, 8, 4, 4, 2,
    4, 4, 8, 4, 4, 2,
    4, 4, 4, 4, 4, 4, 2,
    4, 4, 8, 4, 4, 2
  };

  for (int i = 0; i < sizeof(melody) / sizeof(melody[0]); i++) {
    tone(11, melody[i]);
    delay(1000 / noteDurations[i]);
    noTone(11);
    delay(50); // Adding a small delay for clarity between notes
  }

  // Pause before restarting the melody
  delay(1000);
}