/**
   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"
#include <LiquidCrystal.h>

#define SPEAKER_PIN 8

const uint8_t buttonPins[] = { 12, 11, 10, 9, 7, 6, 5, 4 };
const int buttonTones[] = {
  NOTE_C4, NOTE_D4, NOTE_E4, NOTE_F4,
  NOTE_G4, NOTE_A4, NOTE_B4, NOTE_C5
};
const int numTones = sizeof(buttonPins) / sizeof(buttonPins[0]);
LiquidCrystal lcd(13, 3, 2, A5, A4, A3);

void setup() {
  for (uint8_t i = 0; i < numTones; i++) {
    pinMode(buttonPins[i], INPUT_PULLUP);
  }
  pinMode(SPEAKER_PIN, OUTPUT);
  Serial.begin(9600);
  lcd.begin(16, 4);
  lcd.clear();
}

void loop() {
  int pitch = 0;
  for (uint8_t i = 0; i < numTones; i++) {
    if (digitalRead(buttonPins[i]) == LOW) {
      pitch = buttonTones[i];
    }
  }
  if (pitch) {
    tone(SPEAKER_PIN, pitch);
  } else {
    noTone(SPEAKER_PIN);
  }
  if (digitalRead(NOTE_C4) == HIGH) {
    lcd.setCursor(0, 0);
    lcd.print("Button 1 pressed");
  } else if (digitalRead(NOTE_D4) == HIGH) {
    lcd.setCursor(0, 0);
    lcd.print("Button 2 pressed");
  } else if (digitalRead(NOTE_E4) == HIGH) {
    lcd.setCursor(0, 0);
    lcd.print("Button 3 pressed");
  } else if (digitalRead(NOTE_F4) == HIGH) {
    lcd.setCursor(0, 0);
    lcd.print("Button 4 pressed");
  } else if (digitalRead(NOTE_G4) == HIGH) {
    lcd.setCursor(0, 0);
    lcd.print("Button 5 pressed");
  } else if (digitalRead(NOTE_A4) == HIGH) {
    lcd.setCursor(0, 0);
    lcd.print("Button 6 pressed");
  } else if (digitalRead(NOTE_B4) == HIGH) {
    lcd.setCursor(0, 0);
    lcd.print("Button 7 pressed");
  } else if (digitalRead(NOTE_C5) == HIGH) {
    lcd.setCursor(0, 0);
    lcd.print("Button 8 pressed");
  }
}