int speaker= 2;
int button1= 4;
int button2= 5;
int button3= 6;
int button4= 7;
int button_play= 8;

void setup(){
  pinMode(button1, INPUT);
  pinMode(button2, INPUT);
  pinMode(button3, INPUT);
  pinMode(button4, INPUT);
  pinMode(button_play, INPUT);
  pinMode(speaker, OUTPUT);
}

void loop() {
  if (digitalRead(button1) == HIGH) {
    tone(speaker, 261); // Nada C (Do)
  } else if (digitalRead(button2) == HIGH) {
    tone(speaker, 294); // Nada D (Re)
  } else if (digitalRead(button3) == HIGH) {
    tone(speaker, 329); // Nada E (Mi)
  } else if (digitalRead(button4) == HIGH) {
    tone(speaker, 349); // Nada F (Fa)
  } else if (digitalRead(button_play) == HIGH) {
    playMelody();
  } else {
    noTone(speaker); 
  }
void playMelody() {
  SOL(); delay(500);    MI(); delay(1000);    SOL(); delay(1000);
  DOO(); delay(1000);   DIAM(); delay(500);
  SOL(); delay(500);    DOO(); delay(500);    SOL(); delay(500);
  FA(); delay(500);     MI(); delay(500);     RE(); delay(1000);
  DIAM(); delay(500);

  FA(); delay(500);     RE(); delay(1000);    FA(); delay(1000);
  LA(); delay(1000);    SOL(); delay(500);    DO(); delay(500);
  MI(); delay(500);     RE(); delay(500);     DO(); delay(1000);
  DIAM(); delay(500);

  SOL(); delay(500);    MI(); delay(1000);   SOL(); delay(1000);
  DIAM(); delay(500);

  SOL(); delay(500);    DOO(); delay(500);   SOL(); delay(500);
  FA(); delay(500);     MI(); delay(500);    RE(); delay(1000);
  DIAM(); delay(500);

  FA(); delay(500);     RE(); delay(1000);    FA(); delay(1000);
  LA(); delay(1000);    SOL(); delay(500);    DO(); delay(500);
  MI(); delay(500);     RE(); delay(500);     DO(); delay(1000);
  DIAM(); delay(500);
}

// fungsi nada
void DO(){
  tone(speaker, 262);
}
void RE(){
  tone(speaker, 294);
}
void MI(){
  tone(speaker, 330);
}
void FA(){
  tone(speaker, 349);
}
void SOL(){
  tone(speaker, 395);
}
void LA(){
  tone(speaker, 440);
}
void SI(){
  tone(speaker, 494);
}
void DOO(){
  tone(speaker, 523);
}
void DIAM(){
  noTone(speaker);

}
}