int idr = A5;
int ied = 9;
int nolai;
void  setup() {
  // put your main code here ,to run repeatedly:
  Serial.begin(9600);
  pinMode(led, OUTPUT);
}
void loop() {
    nilai = analogRead(idr);
  Serial.print("Nilai LDR :  ");
  Serial.println(nilai);
  if(nilai > 800){
    digitalWrite(ied, HIGH);
    Serial.println("keadaan gelap, relay menyala");
  }else{
    digitalWrite(led, LOW);
    Serial.println("keadaan terang, relay mati");
  }
  delay(1000);
}