#define BUZZER_PIN 25  // Speaker or Buzzer Pin

// Notes Frequency in Hz
#define NOTE_B3  247
#define NOTE_C4  262
#define NOTE_D4  294
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_G4  392
#define NOTE_A4  440
#define NOTE_REST 0   // Pause/Silence

// Song Melody (Frequency Array)
int melody[] = {
  // तुझे देखा तो ये जाना सनम
  NOTE_E4, NOTE_E4, NOTE_D4, NOTE_C4,
  NOTE_D4, NOTE_C4, NOTE_B3, NOTE_C4,
  NOTE_D4, NOTE_D4, NOTE_C4,
  NOTE_REST,

  // प्यार होता है दीवाना सनम
  NOTE_E4, NOTE_E4, NOTE_D4, NOTE_C4,
  NOTE_D4, NOTE_C4, NOTE_B3, NOTE_C4,
  NOTE_D4, NOTE_D4, NOTE_C4,
  NOTE_REST,

  // अब यहाँ से कहाँ जाएँ हम
  NOTE_G4, NOTE_G4, NOTE_F4, NOTE_E4,
  NOTE_F4, NOTE_E4, NOTE_D4, NOTE_E4,
  NOTE_F4, NOTE_F4, NOTE_E4,
  NOTE_REST,

  // तेरी बाहों में मर जाएँ हम
  NOTE_G4, NOTE_G4, NOTE_F4, NOTE_E4,
  NOTE_F4, NOTE_E4, NOTE_D4, NOTE_E4,
  NOTE_F4, NOTE_F4, NOTE_E4,
  NOTE_REST
};

// Note Durations (4 = quarter note, 8 = eighth note, etc.)
int noteDurations[] = {
  // तुझे देखा तो ये जाना सनम
  6, 6, 6, 6,
  6, 6, 6, 6,
  6, 6, 6,
  6,

  // प्यार होता है दीवाना सनम
  4, 4, 4, 4,
  4, 4, 4, 4,
  4, 4, 2,
  4,

  // अब यहाँ से कहाँ जाएँ हम
  4, 4, 4, 4,
  4, 4, 4, 4,
  4, 4, 2,
  4,

  // तेरी बाहों में मर जाएँ हम
  4, 4, 4, 4,
  4, 4, 4, 4,
  4, 4, 2,
  4
};

void playTone(int frequency, int duration) {
  if (frequency == NOTE_REST) {
    ledcWriteTone(BUZZER_PIN, 0); // Silence
  } else {
    ledcWriteTone(BUZZER_PIN, frequency);
  }
  delay(duration);
  ledcWriteTone(BUZZER_PIN, 0); // Stop note
}

void setup() {
  // Attach Pin to LEDC Channel (ESP32 Arduino Core v3.x syntax)
  ledcAttach(BUZZER_PIN, 2000, 8);
}

void loop() {
  int totalNotes = sizeof(melody) / sizeof(melody[0]);

  for (int thisNote = 0; thisNote < totalNotes; thisNote++) {
    // Note duration calculation (1000ms / duration)
    int duration = 1000 / noteDurations[thisNote];
    
    playTone(melody[thisNote], duration);

    // Pause between notes to distinguish them
    int pauseBetweenNotes = duration * 0.30;
    delay(pauseBetweenNotes);
  }

  // Wait 3 seconds before repeating the song
  delay(3000);
}