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

#define ENCODER_CLK 2
#define ENCODER_DT 3
#define ENCODER_SW 4

int counter = 0;

void setup() {
  lcd.init();
  lcd.backlight();

  // Initialize encoder pins
  pinMode(ENCODER_CLK, INPUT);
  pinMode(ENCODER_DT, INPUT);
  pinMode(ENCODER_SW, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(ENCODER_CLK), readEncoder, FALLING);
}

void readEncoder() {
  int dtValue = digitalRead(ENCODER_DT);
  if (dtValue == HIGH) {
    counter++;// Clockwise
  }
  if (dtValue== LOW){
    counter--;// Counterclockwise
  }
}

int getCounter(){
  int result;
  noInterrupts();
  result = counter;
interrupts();
return result;
}

void resetCounter() {
  noInterrupts();
  counter = 0;
  interrupts();
}

void loop() {
  lcd.setCursor(3,0);
  lcd.print("Counter:");
  lcd.setCursor(7, 1);
  lcd.print(getCounter());
  lcd.print("       ");

  if (digitalRead(ENCODER_SW) == LOW) {
    resetCounter();
  }
}