/**
   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.
*/

const uint8_t buttonPins[] = { 12, 11, 10, 9, 7, 6, 5, 4 };

void setup() {
  for (uint8_t i = 0; i < 8; i++) {
    pinMode(buttonPins[i], INPUT_PULLUP);
  }
  Serial.begin(9600);
}

void loop() {
  int pitch = 0;
  for (uint8_t i = 0; i < 8; i++) {
    if (digitalRead(buttonPins[i]) == LOW) {
      pitch = i;
    }
  }
  if (pitch) {
    Serial.println(i);
}