/*
  This example demonstrates how to play simple melodies
  using a passive buzzer module and the tone() function.

  Board: Arduino Uno R3 / Uno R4
  Component: Passive Buzzer Module (e.g. KY-006)
  Pin connection:
    - Buzzer signal pin -> Digital pin 8
    - VCC -> 5V
    - GND -> GND

  Note:
  Two melodies are included in this sketch.
  Only ONE melody should be active at a time.
  The other melody is commented out and can be enabled if needed.
*/

#include "pitches.h"

const int buzzerPin = 8;

// ------------------------------------------------------------
// Melody selection
// Uncomment ONE melody block below to play the desired song
// ------------------------------------------------------------

// Melody 1: Ode to Joy (Beethoven) - one section
/*
int melody[] = {
  NOTE_E4, NOTE_E4, NOTE_F4, NOTE_G4,
  NOTE_G4, NOTE_F4, NOTE_E4, NOTE_D4,
  NOTE_C4, NOTE_C4, NOTE_D4, NOTE_E4,
  NOTE_E4, NOTE_D4, NOTE_D4
};

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

// Melody 2: Happy Birthday (classic version)
int melody[] = {
  NOTE_G4, NOTE_G4, NOTE_A4, NOTE_G4, NOTE_C5, NOTE_B4,
  NOTE_G4, NOTE_G4, NOTE_A4, NOTE_G4, NOTE_D5, NOTE_C5,
  NOTE_G4, NOTE_G4, NOTE_G5, NOTE_E5, NOTE_C5, NOTE_B4, NOTE_A4,
  NOTE_F5, NOTE_F5, NOTE_E5, NOTE_C5, NOTE_D5, NOTE_C5
};

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

void setup() {
  // Calculate the total number of notes in the melody
  int notes = sizeof(melody) / sizeof(melody[0]);

  // Play the melody once
  for (int i = 0; i < notes; i++) {

    // Calculate note duration
    // 1000 ms = one whole note
    // 4 = quarter note, 8 = eighth note, etc.
    int noteDuration = 1000 / noteDurations[i];

    // Generate the sound at the given frequency
    // Duration is controlled manually using delay()
    tone(buzzerPin, melody[i]);

    // Keep the note playing for the calculated duration
    delay(noteDuration);

    // Stop the sound before the next note
    noTone(buzzerPin);

    // Short pause between notes for better clarity
    delay(noteDuration * 0.3);
  }
}

void loop() {
  // The melody is played once in setup().
  // No repetition is needed in loop().
}