#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Alamat I2C untuk LCD 16x2. Bisa berbeda tergantung pada modul LCD I2C Anda.
LiquidCrystal_I2C lcd(0x27, 16, 2);

const int ledPins[] = {8, 7, 4, 2}; // Pin Arduino yang terhubung ke LED

void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2); // Menyediakan argumen untuk jumlah kolom dan baris
  lcd.backlight();

  for (int i = 0; i < 4; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], LOW); // Pastikan LED OFF saat awal
  }

  lcd.clear();
  lcd.setCursor(5, 0);
  lcd.print("DM_23");
  lcd.setCursor(2, 10);
  lcd.print("System Ready");
  delay(2000);
  lcd.clear();
  updateLCD(); // Update initial LCD display
}

void loop() {
  // Turn on all LEDs one by one
  for (int i = 0; i < 4; i++) {
    digitalWrite(ledPins[i], HIGH);
    updateLCD();
    delay(3000);
  }
  
  // Turn off all LEDs one by one
  for (int i = 0; i < 4; i++) {
    digitalWrite(ledPins[i], LOW);
    updateLCD();
    delay(3000);
  }
}

void updateLCD() {
  lcd.clear();
  lcd.setCursor(1, 0);
  lcd.print("F1: ");
  lcd.print(digitalRead(ledPins[0]) ? "ON " : "OFF");
  
  lcd.setCursor(9, 0);
  lcd.print("F2: ");
  lcd.print(digitalRead(ledPins[1]) ? "ON " : "OFF");
  
  lcd.setCursor(1, 1);
  lcd.print("F3: ");
  lcd.print(digitalRead(ledPins[2]) ? "ON " : "OFF");
  
  lcd.setCursor(10, 1);
  lcd.print("A: ");
  lcd.print(digitalRead(ledPins[3]) ? "ON " : "OFF");
}