/**
   Mini piano for Arduino.

   You can control the colorful buttons with your keyboard:
   After starting the simulation, click anywhere in the diagram to focus it.
   Then press any key between 1 and 8 to play the piano (1 is the lowest note,
   8 is the highest).

   Copyright (C) 2021, Uri Shaked. Released under the MIT License.
*/

#include "pitches.h"

#define SPEAKER_PIN 8
const int resistor = A0;
 const uint8_t buttonPins[] = { 12, 11, 10, 9, 7, 6, 5, 4 };
const int buttonTonesC[] = {
  NOTE_C4, NOTE_D4, NOTE_E4, NOTE_F4,
  NOTE_G4, NOTE_A4, NOTE_B4, NOTE_C5
};
const int buttonTonesG[] = {
  NOTE_G4, NOTE_A4, NOTE_B4, NOTE_C5,
  NOTE_CS5, NOTE_DS5, NOTE_E5, NOTE_FS5
};
const int numTones = sizeof(buttonPins) / sizeof(buttonPins[0]);

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(A0, INPUT);
  for (uint8_t i = 0; i < numTones; i++) {
    pinMode(buttonPins[i], INPUT_PULLUP);
  }
  pinMode(SPEAKER_PIN, OUTPUT);
}

void loop() {
  int pitch = 0;
  digitalWrite(LED_BUILTIN, digitalRead((A0)));
  for (uint8_t i = 0; i < numTones; i++) {
    if (digitalRead(buttonPins[i]) == LOW)
    {
      if (digitalRead((A0)) == HIGH)
      {
        pitch = buttonTonesG[i];
      }
      else
      {
        pitch = buttonTonesC[i];
      }
    }
  }
  if (pitch) {
    tone(SPEAKER_PIN, pitch);
  } else {
    noTone(SPEAKER_PIN);
  }
}