int polo= 4;
int led=4;
int led2=13;
void setup() {
  // put your setup code here, to run once:
pinMode(polo, OUTPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(polo, HIGH);
Serial.println("rele encendido");
delay(1000);

digitalWrite(polo, LOW);
Serial.println("rele apagado");
digitalWrite(led2, HIGH);
Serial.println("led encendido");
delay(1000);
digitalWrite(led2, LOW);
}