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

byte clk = 2;
byte dt = 3;
byte sw = 4;
int counter = 0;
int previous_counter = 0;

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

void setup(){
  attachInterrupt(digitalPinToInterrupt(clk),encoder,FALLING);
  button.setDebounceTime(25);

  lcd.init();
  lcd.clear();
  lcd.backlight();

  lcd_print(0,0,"Enter one Number : ");
  lcd_print(0,1,String(counter));
}

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

void loop(){
  button.loop();

  //  if button is pressed
  if (button.isPressed()){
    lcd.clear();
    String bin = "Binary      : " + String(counter , BIN);
    String dec = "Decimal     : " + String(counter , DEC);
    String hex = "Hexadecimal : " + String(counter , HEX);
    lcd_print(0,0,bin);
    lcd_print(0,1,dec);
    lcd_print(0,2,hex);
  }

  if (previous_counter != counter){
    lcd.clear();
    lcd_print(0,0,"Enter a Number : ");
    lcd_print(0,1,String(counter));
    previous_counter = counter;
  }
  delay(10);
}


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