byte ldr = A5;
byte led = 9;
int nilai;

void setup() {
  //put your setup code here, to run once
  Serial. begin (9600);
  pinMode(led, OUTPUT);

}
void loop (){
  // put your main code here,to run repeatedly:
  nilai = analogRead(ldr);
  Serial. print("Nilai LDR:");
  Serial. print(nilai);

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