// https://wokwi.com/projects/427049511998951425
// Using an array of buttons
// See also forum discussion at 
// https://forum.arduino.cc/t/simple-keyboard-using-the-tone-function/1369567


// Adapted from Arduino Built-in example Keyboard
// https://wokwi.com/projects/409953647477353473
// Code from https://docs.arduino.cc/built-in-examples/digital/toneKeyboard
// Other simulations https://forum.arduino.cc/t/wokwi-simulations-for-arduino-built-in-examples/1304754

/*
  Keyboard

  Plays a pitch that changes based on a button press

  circuit:
  - five buttons from ground to A0 to A5
  - 8 ohm speaker on digital pin 8

  modified 2025-04-01
  created 21 Jan 2010
  modified 9 Apr 2012
  by Tom Igoe

  This example code is in the public domain.

  https://www.arduino.cc/en/Tutorial/BuiltInExamples/toneKeyboard
*/

#include "pitches.h"

const int numberOfKeys = 6;
const int pressedLevel = LOW;  // reading of the keys that generates a note

// notes to play, corresponding to the keys:
int notes[] = {
  NOTE_D4, NOTE_E4, NOTE_C4, NOTE_C3, NOTE_G3, NOTE_C3
};
const int buttons[] = {
  A0, A1, A2, A3, A4, A5
};

void setup() {
  for (int thisKey = 0; thisKey < numberOfKeys; thisKey++) {
    pinMode(buttons[thisKey], INPUT_PULLUP);
  }
}

void loop() {
  for (int thisKey = 0; thisKey < numberOfKeys; thisKey++) {
    // get a sensor reading:
    int sensorReading = digitalRead(buttons[thisKey]);

    // if the sensor is pressed:
    if (sensorReading == pressedLevel) {
      // play the note corresponding to this sensor:
      tone(8, notes[thisKey], 20);
    }
  }
}