#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);

#define ENCORDER_CLK 2
#define ENCORDER_DT 3
#define ENCORDER_SW 4

int counter = 0;

void setup() {

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

pinMode(ENCORDER_CLK, INPUT);
pinMode(ENCORDER_DT, INPUT);
pinMode(ENCORDER_SW, INPUT_PULLUP);

attachInterrupt(digitalPinToInterrupt(ENCORDER_CLK), readEncorder, FALLING);

}

void readEncorder() {

  int dtValue = digitalRead(ENCORDER_DT);
if (dtValue == HIGH){
  counter++;
 }

if (dtValue == LOW) {
  counter--;
 }
}

void loop(){

lcd.setCursor(0,0);
lcd.print("counter");
lcd.setCursor(0,1);
lcd.print(counter);

}