const int dormitorio1=2;//declaracion de constantes
const int dormitorio2=3;
const int sala1=4;
const int sala2=5;

void setup() {
  // put your setup code here, to run once:
pinMode(dormitorio1, OUTPUT);
pinMode(dormitorio2, OUTPUT);
pinMode(sala1, OUTPUT);
pinMode(sala2, OUTPUT);
digitalWrite(dormitorio1, 1);
digitalWrite(dormitorio2, 1);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(sala1, 1);
digitalWrite(sala2, 1);
delay(500);
digitalWrite(sala1, 0);
digitalWrite(sala2, 0);
delay(500);
}