int cahaya = 0;

void setup() {
  // put your setup code here, to run once:
pinMode (A0,INPUT);
pinMode (8,OUTPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
cahaya = analogRead(A0);
if (cahaya > 500){
  Serial.println(cahaya);
  digitalWrite(8, HIGH);
}
else{
  Serial.println(cahaya);
  digitalWrite(8, LOW);
}
delay(1000);
}