// tangga nada C  
#define NOTE_C4 262 // DO 
#define NOTE_D4 294 // RE 
#define NOTE_E4 330 // MI 
#define NOTE_F4 349 // FA 
#define NOTE_G4 392 // SOL 
#define NOTE_A4 440 // LA 
#define NOTE_B4 494 // SI 
#define NOTE_C5 523 // DO 
// speaker ada di pin 9 

const int pinSpeaker = 9; 
#define tombolDo 12
int a = 0;

void setup() { 
  Serial.begin(9600);
pinMode(pinSpeaker, OUTPUT); 
pinMode (tombolDo, INPUT_PULLUP);
} 

void loop() { 
int data = digitalRead(tombolDo);
if (data == LOW){
  tone(pinSpeaker, NOTE_C4, 500); 
  delay(500); 
  a++;
  Serial.println (a);
}
/*tone(pinSpeaker, NOTE_D4, 500); 
delay(500); 
tone(pinSpeaker, NOTE_E4, 500); 
delay(500); 
tone(pinSpeaker, NOTE_F4, 500); 
delay(500); 
tone(pinSpeaker, NOTE_G4, 500); 
delay(500); 
tone(pinSpeaker, NOTE_A4, 500); 
delay(500); 
tone(pinSpeaker, NOTE_B4, 500); 
delay(500); 
tone(pinSpeaker, NOTE_C5, 500); 
delay(500); 
noTone(pinSpeaker); 
delay(1000); */
}