Active Buzzer

const int buzzerPin = 15;  // Pin connected to the buzzer

// Notes (in Hz) for the song
const int NOTE_E4 = 330;
const int NOTE_D4 = 294;
const int NOTE_C4 = 262;
const int NOTE_G3 = 196;

// Song melody and note durations (4 = quarter note, 8 = eighth note, etc.)
int melody[] = { NOTE_E4, NOTE_D4, NOTE_C4, NOTE_D4, NOTE_E4, NOTE_E4, NOTE_E4,
                 NOTE_D4, NOTE_D4, NOTE_D4, NOTE_E4, NOTE_G3, NOTE_G3 };

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

void setup() {
  // No setup required for the buzzer
}

void loop() {
  for (int i = 0; i < sizeof(melody) / sizeof(melody[0]); i++) {
    int duration = 1000 / noteDurations[i];  // Convert note duration to milliseconds
    tone(buzzerPin, melody[i], duration);    // Play the note on the buzzer
    delay(duration * 1.3);                   // Pause between notes (1.3x duration for spacing)
    noTone(buzzerPin);                       // Stop the tone
  }

  delay(100);  // Delay before repeating the song
}