void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(26,OUTPUT);  // Rele ^PIN
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("Desactiva Rele");
  digitalWrite(26, LOW);    // Activa Rele
  delay (3000);

  Serial.println("Activa Rele");
  digitalWrite(26, HIGH);  // Desactiva Rele
  delay(3000);
}