Output devices

    /* 
    Imperial March - Star Wars
    credits: Robson Couto, 2019                               
    */

    #define NOTE_B0  31
    #define NOTE_C1  33
    #define NOTE_CS1 35
    #define NOTE_D1  37
    #define NOTE_DS1 39
    #define NOTE_E1  41
    #define NOTE_F1  44
    #define NOTE_FS1 46
    #define NOTE_G1  49
    #define NOTE_GS1 52
    #define NOTE_A1  55
    #define NOTE_AS1 58
    #define NOTE_B1  62
    #define NOTE_C2  65
    #define NOTE_CS2 69
    #define NOTE_D2  73
    #define NOTE_DS2 78
    #define NOTE_E2  82
    #define NOTE_F2  87
    #define NOTE_FS2 93
    #define NOTE_G2  98
    #define NOTE_GS2 104
    #define NOTE_A2  110
    #define NOTE_AS2 117
    #define NOTE_B2  123
    #define NOTE_C3  131
    #define NOTE_CS3 139
    #define NOTE_D3  147
    #define NOTE_DS3 156
    #define NOTE_E3  165
    #define NOTE_F3  175
    #define NOTE_FS3 185
    #define NOTE_G3  196
    #define NOTE_GS3 208
    #define NOTE_A3  220
    #define NOTE_AS3 233
    #define NOTE_B3  247
    #define NOTE_C4  262
    #define NOTE_CS4 277
    #define NOTE_D4  294
    #define NOTE_DS4 311
    #define NOTE_E4  330
    #define NOTE_F4  349
    #define NOTE_FS4 370
    #define NOTE_G4  392
    #define NOTE_GS4 415
    #define NOTE_A4  440
    #define NOTE_AS4 466
    #define NOTE_B4  494
    #define NOTE_C5  523
    #define NOTE_CS5 554
    #define NOTE_D5  587
    #define NOTE_DS5 622
    #define NOTE_E5  659
    #define NOTE_F5  698
    #define NOTE_FS5 740
    #define NOTE_G5  784
    #define NOTE_GS5 831
    #define NOTE_A5  880
    #define NOTE_AS5 932
    #define NOTE_B5  988
    #define NOTE_C6  1047
    #define NOTE_CS6 1109
    #define NOTE_D6  1175
    #define NOTE_DS6 1245
    #define NOTE_E6  1319
    #define NOTE_F6  1397
    #define NOTE_FS6 1480
    #define NOTE_G6  1568
    #define NOTE_GS6 1661
    #define NOTE_A6  1760
    #define NOTE_AS6 1865
    #define NOTE_B6  1976
    #define NOTE_C7  2093
    #define NOTE_CS7 2217
    #define NOTE_D7  2349
    #define NOTE_DS7 2489
    #define NOTE_E7  2637
    #define NOTE_F7  2794
    #define NOTE_FS7 2960
    #define NOTE_G7  3136
    #define NOTE_GS7 3322
    #define NOTE_A7  3520
    #define NOTE_AS7 3729
    #define NOTE_B7  3951
    #define NOTE_C8  4186
    #define NOTE_CS8 4435
    #define NOTE_D8  4699
    #define NOTE_DS8 4978
    #define REST      0


    // change this to make the song slower or faster
    int tempo = 120;

    // change this to whichever pin you want to use
    int buzzer = D4;

    // notes of the moledy followed by the duration.
    // a 4 means a quarter note, 8 an eighteenth , 16 sixteenth, so on
    // !!negative numbers are used to represent dotted notes,
    // so -4 means a dotted quarter note, that is, a quarter plus an eighteenth!!
    int melody[] = {
    
    // Dart Vader theme (Imperial March) - Star wars 
    // The tenor saxophone part was used
    
    NOTE_A4,-4, NOTE_A4,-4, NOTE_A4,16, NOTE_A4,16, NOTE_A4,16, NOTE_A4,16, NOTE_F4,8, REST,8,
    NOTE_A4,-4, NOTE_A4,-4, NOTE_A4,16, NOTE_A4,16, NOTE_A4,16, NOTE_A4,16, NOTE_F4,8, REST,8,
    NOTE_A4,4, NOTE_A4,4, NOTE_A4,4, NOTE_F4,-8, NOTE_C5,16,

    NOTE_A4,4, NOTE_F4,-8, NOTE_C5,16, NOTE_A4,2,//4
    NOTE_E5,4, NOTE_E5,4, NOTE_E5,4, NOTE_F5,-8, NOTE_C5,16,
    NOTE_A4,4, NOTE_F4,-8, NOTE_C5,16, NOTE_A4,2,
    
    NOTE_A5,4, NOTE_A4,-8, NOTE_A4,16, NOTE_A5,4, NOTE_GS5,-8, NOTE_G5,16, //7 
    NOTE_DS5,16, NOTE_D5,16, NOTE_DS5,8, REST,8, NOTE_A4,8, NOTE_DS5,4, NOTE_D5,-8, NOTE_CS5,16,

    NOTE_C5,16, NOTE_B4,16, NOTE_C5,16, REST,8, NOTE_F4,8, NOTE_GS4,4, NOTE_F4,-8, NOTE_A4,-16,//9
    NOTE_C5,4, NOTE_A4,-8, NOTE_C5,16, NOTE_E5,2,

    NOTE_A5,4, NOTE_A4,-8, NOTE_A4,16, NOTE_A5,4, NOTE_GS5,-8, NOTE_G5,16, //7 
    NOTE_DS5,16, NOTE_D5,16, NOTE_DS5,8, REST,8, NOTE_A4,8, NOTE_DS5,4, NOTE_D5,-8, NOTE_CS5,16,

    NOTE_C5,16, NOTE_B4,16, NOTE_C5,16, REST,8, NOTE_F4,8, NOTE_GS4,4, NOTE_F4,-8, NOTE_A4,-16,//9
    NOTE_A4,4, NOTE_F4,-8, NOTE_C5,16, NOTE_A4,2,
    
    };

    // sizeof gives the number of bytes, each int value is composed of two bytes (16 bits)
    // there are two values per note (pitch and duration), so for each note there are four bytes
    int notes = sizeof(melody) / sizeof(melody[0]) / 2;

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

    int divider = 0, noteDuration = 0;

    void setup() {
    // iterate over the notes of the melody. 
    // Remember, the array is twice the number of notes (notes + durations)
    for (int thisNote = 0; thisNote < notes * 2; thisNote = thisNote + 2) {

        // calculates the duration of each note
        divider = melody[thisNote + 1];
        if (divider > 0) {
        // regular note, just proceed
        noteDuration = (wholenote) / divider;
        } else if (divider < 0) {
        // dotted notes are represented with negative durations!!
        noteDuration = (wholenote) / abs(divider);
        noteDuration *= 1.5; // increases the duration in half for dotted notes
        }

        // we only play the note for 90% of the duration, leaving 10% as a pause
        tone(buzzer, melody[thisNote], noteDuration*0.9);

        // Wait for the specief duration before playing the next note.
        delay(noteDuration);
        
        // stop the waveform generation before the next note.
        noTone(buzzer);
    }
    }

    void loop() {
    // no need to repeat the melody.
    }