//NOTE_C4, NOTE_A4, NOTE_A4, NOTE_G4,
// NOTE_A4, NOTE_F4, NOTE_C4, NOTE_C4,

#define SPEAKER_PIN 2
#include "pitches.h"

void setup() {
  pinMode(7, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(5, OUTPUT);
    pinMode(4, OUTPUT);
}

void loop() {
  boolean keyDown13 = digitalRead(13);
  boolean keyDown12 = digitalRead(12);
  boolean keyDown11 = digitalRead(11);
  boolean keyDown10 = digitalRead(10);
  

  if (keyDown13) {
    digitalWrite(7, HIGH);
      tone(SPEAKER_PIN, NOTE_C4);
    delay(150);
  } else {
    digitalWrite(7, LOW);
      noTone(SPEAKER_PIN);
  }

  if (keyDown12) {
    digitalWrite(6, HIGH);
    tone(SPEAKER_PIN, NOTE_A4);
  } else {
    digitalWrite(6, LOW);
    noTone(SPEAKER_PIN);
  }

  if (keyDown11) {
    digitalWrite(5, HIGH);
    tone(SPEAKER_PIN, NOTE_G4);
  } else {
    digitalWrite(5, LOW);
    noTone(SPEAKER_PIN);
  }

    if (keyDown10) {
    digitalWrite(4, HIGH);
    tone(SPEAKER_PIN, NOTE_F4);
  } else {
    digitalWrite(4, LOW);
    noTone(SPEAKER_PIN);
  }

}