Arduino — прошивка для дверного звонка

Сделал звонок больше 2 лет назад, до сих пор работает без проблем. Исходник:

/*************************************************
 * 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


 
// notes in the melody:
int melody[] = {
  NOTE_C5, NOTE_D5, NOTE_E5, NOTE_F5, NOTE_G5, NOTE_A5, NOTE_B5, NOTE_C6};
int duration = 500;  // 500 miliseconds
 
const int voicePin = 12;     // passive buzzer
const int buttonPin = 2;     // the number of the pushbutton pin

// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status

 
void setup() {
  pinMode(13, OUTPUT);
  digitalWrite(13, LOW);
}
 
void loop() {  
  
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);
  
  if(buttonState == HIGH){
    //shut your mouth
    tone(voicePin, NOTE_D5, 400); delay(400);
    tone(voicePin, NOTE_A5, 200); delay(200);
    tone(voicePin, NOTE_G5, 200); delay(200);
    tone(voicePin, NOTE_AS5, 400); delay(400);
    tone(voicePin, NOTE_A5, 200); delay(200);
    tone(voicePin, NOTE_G5, 200);  delay(200);
    tone(voicePin, NOTE_A5, 400); delay(400);
    tone(voicePin, NOTE_G5, 200); delay(200);
    tone(voicePin, NOTE_A5, 200); delay(200);
    tone(voicePin, NOTE_AS5, 200); delay(200);
    tone(voicePin, NOTE_AS5, 200); delay(200);
    tone(voicePin, NOTE_A5, 200); delay(200);
    tone(voicePin, NOTE_G5, 400); delay(200);
    //tone(voicePin, NOTE_D5, 400); delay(400);
    
    tone(voicePin, NOTE_D5, 400); delay(400);
    tone(voicePin, NOTE_A5, 200); delay(200);
    tone(voicePin, NOTE_G5, 200); delay(200);
    tone(voicePin, NOTE_AS5, 400); delay(400);
    tone(voicePin, NOTE_A5, 200); delay(200);
    tone(voicePin, NOTE_G5, 200); delay(200);
    tone(voicePin, NOTE_F5, 400); delay(400);
    tone(voicePin, NOTE_G5, 200); delay(200);
    tone(voicePin, NOTE_F5, 200); delay(200);
    tone(voicePin, NOTE_E5, 200); delay(200);
    tone(voicePin, NOTE_E5, 200); delay(200);
    tone(voicePin, NOTE_F5, 200); delay(200);
    tone(voicePin, NOTE_E5, 200); delay(200);
    tone(voicePin, NOTE_D5, 400); delay(400);
    
     
    // restart after two seconds 
    delay(2000);
  }
  
  delay(300);
}

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