int LDR = A2;
int LED = 13;
int nilai;

void setup() {
  pinMode(LED, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  nilai = analogRead(LDR);
  Serial.println(nilai);
  delay(200);

  if (nilai < 500) {
    digitalWrite(LED, HIGH);
  }
  else {
    digitalWrite(LED, LOW);
  }

}