Programación de Fotocelda

void setup()
{
pinMode(2,OUTPUT);//led verde
pinMode(3,OUTPUT);//led amarillo
pinMode(A0, INPUT);//fotocela
}

void loop()
{
  int fotocelda=analogRead(A0);
  if(fotocelda<100)
  {
    digitalWrite(2,HIGH);//encender LED
    digitalWrite(3,HIGH);//encender LED
  }
  else
  {
    digitalWrite(2,LOW);//apagar LED
    digitalWrite(3,LOW);//apagar LED
  }
}