int speakerPin = 7; // Buzzer pin
int length = 28; // Number of notes

// Notes for "Happy Birthday"
char notes[] = "GGAGcB GGAGdc GGxecBA yyecdc";
int beats[] = {2, 2, 8, 8, 8, 16, 1, 2, 2, 8, 8, 8, 16, 1, 2, 2, 8, 8, 8, 8, 16, 1, 2, 2, 8, 8, 8, 16};
int tempo = 200; // Time delay between notes

void playTone(int tone, int duration) {
    for (long i = 0; i < duration * 1000L; i += tone * 2) {
        digitalWrite(speakerPin, HIGH);
        delayMicroseconds(tone);
        digitalWrite(speakerPin, LOW);
        delayMicroseconds(tone);
    }
}

void playNote(char note, int duration) {
    char names[] = {'C', 'D', 'E', 'F', 'G', 'A', 'B', 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'x', 'y'};
    int tones[] = {1915, 1700, 1519, 1432, 1275, 1136, 1014, 956, 834, 765, 593, 468, 346, 224, 655, 715};
    int SPEE = 5;

    for (int i = 0; i < 17; i++) {
        if (names[i] == note) {
            int newduration = duration / SPEE;
            playTone(tones[i], newduration);
        }
    }
}

void setup() {
    pinMode(speakerPin, OUTPUT);
}

void loop() {
    for (int i = 0; i < length; i++) {
        if (notes[i] == ' ') {
            delay(beats[i] * tempo); // Delay between notes
        } else {
            playNote(notes[i], beats[i] * tempo);
        }
        delay(tempo); // Time delay between notes
    }
}