#define buzzer 13
const int btnPin [] = {4,3,2};
void setup() {
  Serial.begin(9600);
  for(int i = 0; i <=2 ; i++){
    pinMode(btnPin[i], INPUT_PULLUP);
  }
  pinMode(buzzer, OUTPUT);
  Serial.println("start");

}

void loop() {
    if(digitalRead(btnPin[0])==LOW){
      tone(buzzer,622);
      delay(300);
    }
    if(digitalRead(btnPin[1])==LOW){
      tone(buzzer,587);
      delay(300);
    }
    if(digitalRead(btnPin[2])==LOW){
      tone(buzzer,554);
      delay(300);
    }
  noTone(buzzer);

}