#include <LiquidCrystal_I2C.h>

// Inisialisasi LCD I2C
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Pin definisi
const int potPin = A0;       // Pin potensiometer
const int greenLed = 5;     // Pin LED hijau
const int yellowLed = 4;    // Pin LED kuning
const int redLed = 3;       // Pin LED merah

void setup() {
  // Inisialisasi pin sebagai output
  pinMode(greenLed, OUTPUT);
  pinMode(yellowLed, OUTPUT);
  pinMode(redLed, OUTPUT);
  
  // Inisialisasi LCD
  lcd.begin(16,2);
  lcd.init();
  lcd.backlight();
}

void loop() {
  int potValue = analogRead(potPin);                // Membaca nilai potensiometer
  int percentage = map(potValue, 0, 1023, 0, 100); // Mengubah nilai menjadi 0-100%
  int a = analogRead(A0);
  int pwm = map(a,0,1023,0,100);
  analogWrite(3, pwm);

  // Menyalakan LED berdasarkan persentase
  if (percentage <= 33) {
    digitalWrite(greenLed, HIGH);
    digitalWrite(yellowLed, LOW);
    digitalWrite(redLed, LOW);
  } else if (percentage <= 66) {
    digitalWrite(greenLed, HIGH);
    digitalWrite(yellowLed, HIGH);
    digitalWrite(redLed, LOW);
  } else if (percentage < 100) {
    digitalWrite(greenLed, HIGH);
    digitalWrite(yellowLed, HIGH);
    digitalWrite(redLed, HIGH);
  } else {
    // Ketika 100%, ketiga LED berkedip
    digitalWrite(greenLed, HIGH);
    digitalWrite(yellowLed, HIGH);
    digitalWrite(redLed, HIGH);
    delay(300); // Tunggu 300ms
    digitalWrite(greenLed, LOW);
    digitalWrite(yellowLed, LOW);
    digitalWrite(redLed, LOW);
    delay(300);
  }

  // Menampilkan nilai persentase pada LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(pwm);
  lcd.print("%");

  delay(250);
}