Arduino Buzzer

coin.ino

#include "pitches.h"

const int SPKR = 13; // Buzzer pin
const int BTN=2;

// notes in the notes:
int notes_1up[] = {NOTE_E5, NOTE_G5, NOTE_E6, NOTE_C6, NOTE_D6, NOTE_G6};
// note durations: 4 = quarter note, 8 = eighth note, etc.:
int durations_1up[] = {4, 4, 4, 4, 4, 4};

// mario coin
int notes_coin[] = {NOTE_B5, NOTE_E6};
int durations_coin[] = { 8, 1 };

int tempo = 400;
int button_state = 0;
int is_playing = 0;
long last_click_at = 0;
long debounce_delay = 200;

void play(int num_notes, int* notes, int* durations) {
  // iterate over the notes of the notes:
  if (is_playing) {
    return;
  }
  is_playing = 1;
  for (int thisNote = 0; thisNote < num_notes; thisNote++) {
    // to calculate the note duration, take the tempo
    // divided by the note type.
    // e.g. quarter note = tempo / 4, eighth note = tempo/8, etc.
    int noteDuration = tempo/durations[thisNote];
    tone(SPKR, notes[thisNote], noteDuration);

    // to distinguish the notes, set a minimum time between them.
    // the note's duration + 30% seems to work well:
    int pauseBetweenNotes = noteDuration * 1.30;
    delay(pauseBetweenNotes);

    // stop the tone playing:
    noTone(SPKR);
  }
  is_playing = 0;
}

void setup()
{
    // Initialize serial communication
    Serial.begin(9600);
    pinMode(SPKR, OUTPUT); //set the speaker as output
    pinMode(BTN, INPUT);
    
    play(6, notes_1up, durations_1up);
    delay(100);
}

void loop() //do this over and over
{
    button_state = digitalRead(BTN);
    long now = millis();
    if ((now - last_click_at) > debounce_delay) {
        if (button_state == HIGH) {
          play(2, notes_coin, durations_coin);
          return;
        }
        last_click_at = now;
    }
    if (Serial.available() > 0) {
      int incoming_byte = Serial.read();
      if (incoming_byte == 'H') {
        play(2, notes_coin, durations_coin);
      }
    }
}

pitches.h

/*************************************************
 * Public Constants
 *************************************************/

#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