byte ldr = A5;
byte led = 12;
int nilai;

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

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

  if(nilai < 1000) {
    digitalWrite(led, HIGH);
    delay(200);
    digitalWrite(led, LOW);
    delay(200);
    Serial.println("keadaan gelap, lampu menyala");
  }else{
    digitalWrite(led, LOW);
    delay(500);
    Serial.println("keadaan terang, lampu mati");
  }
  delay(200);
}