const int buzzer = 11;

const int pinBtn1 = 2;
const int pinBtn2 = 3;
const int pinBtn3 = 4;
const int pinBtn4 = 5;
const int pinBtn5 = 6;
const int pinBtn6 = 7;
const int pinBtn7 = 8;


void setup() {
  // put your setup code here, to run once:
  pinMode(buzzer, OUTPUT);

  pinMode(pinBtn1, INPUT);
  pinMode(pinBtn2, INPUT);
  pinMode(pinBtn3, INPUT);
  pinMode(pinBtn4, INPUT);
  pinMode(pinBtn5, INPUT);
  pinMode(pinBtn6, INPUT);
  pinMode(pinBtn7, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  bool btn1 = digitalRead(pinBtn1);
  bool btn2 = digitalRead(pinBtn2);
  bool btn3 = digitalRead(pinBtn3);
  bool btn4 = digitalRead(pinBtn4);
  bool btn5 = digitalRead(pinBtn5);
  bool btn6 = digitalRead(pinBtn6);
  bool btn7 = digitalRead(pinBtn7);

  if(btn1){
    tone(buzzer, 261.63, 20);
  }
    if(btn2){
    tone(buzzer, 293.66, 20);
  }
    if(btn3){
    tone(buzzer, 329.63, 20);
  }
    if(btn4){
    tone(buzzer, 349.23, 20);
  }
    if(btn5){
    tone(buzzer, 391.99, 20);
  }
    if(btn6){
    tone(buzzer, 440.00, 20);
  }
    if(btn7){
    tone(buzzer, 493.88, 20);
  }
}