#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd (0x27, 16, 2);


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

int counter = 0;

void setup() {
  lcd. init ();
  lcd. backlight ();
  delay(2000);
  lcd.clear();
  pinMode(ENCODER_CLK, INPUT);
  pinMode(ENCODER_DT, INPUT);
  // pinMode(ENCODER_SW, OUTPUT);
  attachInterrupt(digitalPinToInterrupt(ENCODER_CLK), readEncoder, FALLING);
}

void readEncoder() {
  // put your main code here, to run repeatedly:
  int dtValue = digitalRead(ENCODER_DT);
  if (dtValue == HIGH) {
    counter++;
  }
  if (dtValue == LOW) {
    counter--;
  }

  
}

void loop() {
  lcd.setCursor(0,0);
  lcd.print("COUNTER: ");
  lcd.print(counter);
  delay(1);
  // Do whatever
}