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

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

// Pin definisi untuk LED Bar Graph
const int ledPins[] = {2, 3, 4, 5, 6, 7, 8, 9};
const int numLeds = 8;

// Pin definisi untuk potensiometer
const int potPin = A0;

// Variabel
int potValue = 0;
int ledLevel = 0;

void setup() {
// Inisialisasi LCD
lcd.begin(16, 2);
lcd.backlight();
lcd.print("LED Bar Graph");

// Inisialisasi pin LED sebagai output
for (int i = 0; i < numLeds; i++) {
pinMode(ledPins[i], OUTPUT);
}

// Inisialisasi komunikasi serial
Serial.begin(9600);
}

void loop() {
// Membaca nilai potensiometer
potValue = analogRead(potPin);
  
  // Konversi nilai potensiometer ke tingkat LED (0-8)
  ledLevel = map(potValue, 0, 1023, 0, numLeds);

  // Tampilkan nilai di LCD
  lcd.setCursor(0, 1);
  lcd.print("Value: ");
  lcd.print(potValue);
  lcd.print("    "); // Clear extra characters

  // Menyalakan LED Bar Graph sesuai nilai potensiometer
  for (int i = 0; i < numLeds; i++) {
  if (i < ledLevel) {
  digitalWrite(ledPins[i], HIGH);
  } else {
  digitalWrite(ledPins[i], LOW);
    }
    }

    // Debug di Serial Monitor
    Serial.print("Pot Value: ");
    Serial.print(potValue);
    Serial.print(" | LED Level: ");
    Serial.println(ledLevel);

    delay(100);
    }