// Speaker connected to pin 3
const int speakerPin = 3;

// Global speed multiplier: 1.0 = normal, >1 = slower, <1 = faster
float speed = 1.5;  // Try 0.8 for fast, 2.0 for slow

// Define note frequencies
#define NOTE_B0  31
#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
#define NOTE_E5  659
#define NOTE_F5  698
#define NOTE_G5  784
#define NOTE_A5  880
#define NOTE_B5  988

// Tune definitions: {note, base duration in ms}
int nokiaTune[][2] = {
  {NOTE_E5, 200}, {NOTE_D5, 200}, {NOTE_F5, 200}, {NOTE_G5, 400},
  {NOTE_E5, 400}, {NOTE_D5, 400}, {NOTE_C5, 400}
};

int airtelTune[][2] = {
  {NOTE_C5, 300}, {NOTE_E5, 300}, {NOTE_G5, 300}, {NOTE_E5, 300},
  {NOTE_C5, 300}, {NOTE_E5, 300}, {NOTE_G5, 300}, {NOTE_E5, 300}
};

int bsnlTune[][2] = {
  {NOTE_G4, 300}, {NOTE_A4, 300}, {NOTE_B4, 300}, {NOTE_C5, 400},
  {NOTE_B4, 300}, {NOTE_A4, 300}, {NOTE_G4, 300}
};

// Function to play a tune with speed adjustment
void playTune(int tune[][2], int length) {
  for (int i = 0; i < length; i++) {
    int note = tune[i][0];
    int baseDuration = tune[i][1];
    int adjustedDuration = baseDuration * speed;

    tone(speakerPin, note, adjustedDuration);
    delay(adjustedDuration * 1.0); // Slight pause between notes
  }
  delay(1000); // Pause between tunes
}

void setup() {
  // Nothing needed here
}

void loop() {
  playTune(nokiaTune, sizeof(nokiaTune) / sizeof(nokiaTune[0]));
  playTune(airtelTune, sizeof(airtelTune) / sizeof(airtelTune[0]));
  playTune(bsnlTune, sizeof(bsnlTune) / sizeof(bsnlTune[0]));
}