const int sensorPin = A0;    // Pin sensor photoresistor terhubung ke pin analog A0
const int relayPin = 9;      // Pin kaki kontrol relay terhubung ke pin digital 9
int threshold = 500;         // Nilai ambang batas pencahayaan

void setup() {
  pinMode(sensorPin, INPUT);
  pinMode(relayPin, OUTPUT);
}

void loop() {
  int sensorValue = analogRead(sensorPin);

  if (sensorValue < threshold) {
    digitalWrite(relayPin, LOW); // Hidupkan relay jika cahaya rendah
  } else {
    digitalWrite(relayPin, HIGH);  // Matikan relay jika cahaya cukup
  }

  delay(100); // Jeda 100 milidetik
}