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

#define LDR_PIN 34
#define LED_PIN 25

LiquidCrystal_I2C lcd(0x27, 16, 2);

int esik = 2000;

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

  pinMode(LED_PIN, OUTPUT);

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

  lcd.setCursor(0, 0);
  lcd.print("Sistem Basladi");
  delay(2000);
  lcd.clear();
}

void loop() {
  int ldrValue = analogRead(LDR_PIN);
  Serial.println(ldrValue);

  lcd.setCursor(0, 0);
  lcd.print("Durum:");

  lcd.setCursor(0, 1);

  if (ldrValue < esik) {
    lcd.print("Gece   ");

    //  GECE → LED YANIP SONSUN
    digitalWrite(LED_PIN, HIGH);
    delay(300);
    digitalWrite(LED_PIN, LOW);
    delay(300);

  } else {
    lcd.print("Gunduz ");

    //  GÜNDÜZ → LED KAPALI
    digitalWrite(LED_PIN, LOW);
    delay(500);
  }
}