#include <ezButton.h>
#include <LiquidCrystal_I2C.h>

byte clk = 2, dt = 3, sw = 4;
int count = 0, prevCount = -1;
String bin, dec, hex;

LiquidCrystal_I2C lcd(0x27, 20, 4);
ezButton button(sw);

void setup() {
  attachInterrupt(digitalPinToInterrupt(clk), encoder, FALLING);
  button.setDebounceTime(20);

  lcd.init();
  lcd.backlight();
  delay(500);

  lcd_print(0, 0, "-~ Number Converter");
  lcd_print(0, 2, "Input:");
}

void encoder() {
  prevCount = count;
  if (digitalRead(dt) == HIGH) count++;
  else count--;
  count = constrain(count, 0, 256);
}

void loop() {
  button.loop();

  if (button.isPressed()) {
    lcd.clear();
    lcd_print(0, 0, "...");
    delay(500);

    bin = "BIN : " + String(count , BIN);
    dec = "DEC : " + String(count , DEC);
    hex = "HEX : " + String(count , HEX);

    lcd.clear();
    lcd_print(0, 0, "-~ Number Converter");
    lcd_print(0, 1, bin);
    lcd_print(0, 2, dec);
    lcd_print(0, 3, hex);
    delay(10000);

    count = 0, prevCount = -1;
    lcd.clear();
    lcd_print(0, 0, "-~ Number Converter");
    lcd_print(0, 2, "Input:");
  }
  
  if (prevCount != count) {
    lcd_print(7, 2, "   ");
    delay(50);
    lcd_print(7, 2, String(count));
    prevCount = count;
  }
  delay(50);
}

void lcd_print(int x, int y, String message) {
  lcd.setCursor(x, y);
  lcd.print(message);
}