int pinLED = 13;
void setup() {
  // put your setup code here, to run once:
  pinMode(pinLED, OUTPUT); //pin13 como salida
}

void loop() {
  // Se ejecuta en bucle infinito (goto)
  digitalWrite(pinLED, HIGH);
  delay(1000);
  digitalWrite(pinLED, LOW);
  delay(1000);
}