const int LDR_PIN = 4;
const int LED_PIN = 5;

void setup() {
  pinMode(LDR_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  // LDR modülü karanlıkta LOW, aydınlıkta HIGH verir
  // LDR module outputs LOW in dark, HIGH in light
  int ldrState = digitalRead(LDR_PIN);

  if (ldrState == LOW) {
    digitalWrite(LED_PIN, HIGH); // Karanlık → LED aç / Dark → LED on
  } else {
    digitalWrite(LED_PIN, LOW);  // Aydınlık → LED kapat / Light → LED off
  }
  delay(50);
}