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

#define LED_Merah 13
#define LED_Kuning 12
#define LED_Hijau 11

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

int counter = 0; 
//-------------------------------------------------------------------------------

void setup(){
  lcd.init(); 
  lcd.backlight(); 
  pinMode(LED_Merah, OUTPUT);
  pinMode(LED_Kuning, OUTPUT);
  pinMode(LED_Hijau, OUTPUT);
  pinMode(ENCODER_CLK, INPUT);
  pinMode(ENCODER_DT, INPUT);
  pinMode(ENCODER_SW, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(ENCODER_CLK), readEncoder, FALLING);
}
void loop(){
  //lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Counter: ");
  lcd.print(counter);
  lcd.print("                ");

  if (counter == 1){
  digitalWrite(LED_Merah, HIGH);
  digitalWrite(LED_Kuning, LOW);
  digitalWrite(LED_Hijau, LOW);
  }
  else if(counter == 2){
  digitalWrite(LED_Merah, LOW);
  digitalWrite(LED_Kuning, HIGH);
  digitalWrite(LED_Hijau, LOW);
  }
  else if(counter  == 3){
  digitalWrite(LED_Merah, LOW);
  digitalWrite(LED_Kuning, LOW);
  digitalWrite(LED_Hijau, HIGH);
  } 
  else {
  digitalWrite(LED_Merah, LOW);
  digitalWrite(LED_Kuning, LOW);
  digitalWrite(LED_Hijau, LOW);
  }
  delay(50);
}

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