#define ldr A5
#define 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.println(nilai);

  if(nilai < 500){
    digitalWrite(led, HIGH);
    Serial.println("Keadaan gelap, lampu menyala");
  }else{

    digitalWrite(led, LOW);
    Serial.println("Keadaan terang, lampu mati");
  }
  delay(1000);
}