int ldr = A0;
int led = 13;
int nilai;

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

void loop() {
  nilai = analogRead(ldr);
  Serial.print("Nilai LDR: ");
  Serial.println(nilai);

  if (nilai < 200) {
    digitalWrite(led, HIGH);
  }
  else {
    digitalWrite(led, LOW);
  }
}