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

#define LDR_PIN 34
#define LED_PIN 25

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(115200);

  lcd.init();
  lcd.backlight();

  // PWM LED ESP32
  ledcAttach(LED_PIN, 5000, 8);

  lcd.setCursor(0, 0);
  lcd.print("Perpustakaan");
  lcd.setCursor(0, 1);
  lcd.print("Smart Lighting");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Membaca sensor cahaya
  int nilaiLDR = analogRead(LDR_PIN);

  // Mengubah nilai LDR menjadi kecerahan LED
  // Semakin gelap, LED semakin terang
  int brightness = map(nilaiLDR, 0, 4095, 255, 0);
  brightness = constrain(brightness, 0, 255);

  // Mengatur LED
  ledcWrite(LED_PIN, brightness);

  // Menampilkan pada LCD
  lcd.setCursor(0, 0);
  lcd.print("Cahaya: ");
  lcd.print(nilaiLDR);
  lcd.print("    ");

  lcd.setCursor(0, 1);
  lcd.print("LED: ");
  lcd.print(brightness);
  lcd.print("/255   ");

  // Serial Monitor
  Serial.print("Nilai LDR: ");
  Serial.print(nilaiLDR);
  Serial.print(" | LED: ");
  Serial.println(brightness);

  delay(500);
}