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

const int AnalogPin = A0;
const int ledPin1 = 3;  // Lampu hijau
const int ledPin2 = 4;  // Lampu kuning
const int ledPin3 = 5;  // Lampu merah

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  pinMode(AnalogPin, INPUT);
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);

  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  lcd.clear();
}

void loop() {
  int A = analogRead(AnalogPin);
  int pwm = map(A, 0, 1023, 0, 255);
  int brightnessPercentage = map(A, 0, 1023, 0, 100);

  analogWrite(ledPin1, 0);
  analogWrite(ledPin2, 0);
  analogWrite(ledPin3, 0);

  if (brightnessPercentage >= 0 && brightnessPercentage <= 33) {
    analogWrite(ledPin1, pwm);
  } else if (brightnessPercentage > 33 && brightnessPercentage <= 66) {
    analogWrite(ledPin1, pwm);
    analogWrite(ledPin2, pwm);
  } else if (brightnessPercentage > 66 && brightnessPercentage < 100) {
    analogWrite(ledPin1, pwm);
    analogWrite(ledPin2, pwm);
    analogWrite(ledPin3, pwm);
  } else if (brightnessPercentage == 100) {
    for (int i = 0; i < 3; i++) {
      analogWrite(ledPin1, 255);
      analogWrite(ledPin2, 255);
      analogWrite(ledPin3, 255);
      delay(500);
      analogWrite(ledPin1, 0);
      analogWrite(ledPin2, 0);
      analogWrite(ledPin3, 0);
      delay(500);
    }
  }

  lcd.setCursor(0, 0);
  lcd.print("Brightness: ");
  lcd.print(brightnessPercentage);
  lcd.print("%     ");
  delay(500);
}