// Define note frequencies (using the #define statements you provided)
#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_B4  494
#define NOTE_C5  523
#define NOTE_D5  587

// Pin where the piezo buzzer is connected
const int piezoPin = 11;

int tempo = 100; // Tempo of the song

// Define melody: notes followed by their duration (1 = whole note, 2 = half note, etc.)
int melody[] = {
  NOTE_C4, 4,  // Do (C4)
  NOTE_D4, 4,  // Re (D4)
  NOTE_E4, 4,  // Mi (E4)
  NOTE_F4, 4,  // Fa (F4)
  NOTE_G4, 4,  // Sol (G4)
  NOTE_A4, 4,  // La (A4)
  NOTE_B4, 4,  // Ti (B4)
  NOTE_C5, 4,  // High Do (C5)
};

// Calculate the duration of a whole note in ms
int wholenote = (60000 * 4) / tempo;

void setup() {
  Serial.begin(9600);  // Start serial communication at 9600 baud
}

void loop() {
  if (Serial.available() > 0) {
    char note = Serial.read();  // Read the input from the serial monitor

    // Calculate the index in the melody array based on the input
    int index = (note - '1') * 2; // Since each note has a frequency and duration

    // Check if the input is valid (1-9)
    if (index >= 0 && index < sizeof(melody) / sizeof(melody[0])) {
      int frequency = melody[index];  // Get the frequency
      int duration = melody[index + 1];  // Get the duration

      // Calculate the note duration based on the tempo
      int noteDuration = (wholenote) / duration;

      // Play the note using tone() for the calculated duration
      tone(piezoPin, frequency, noteDuration * 0.9);  // 90% of the duration is used for the note
      delay(noteDuration);  // Wait for the note to finish

      noTone(piezoPin);  // Stop the tone after the note is played
    }
  }
}