void setup() {
 pinMode(13, OUTPUT); // Configura el "Pin 13" como SALIDA
 pinMode(12, OUTPUT);
 pinMode(11, OUTPUT);
}

void loop() {
 digitalWrite(13, HIGH); // ENVÍA 5V AL PIN 13
 delay(1000); // ENCENDER LED
 digitalWrite(13, LOW); // REDUCE A 0V EL PIN 13
 delay(1000); // APAGAR LED
 digitalWrite(12, HIGH); // ENVÍA 5V AL PIN 12
 delay(1000); // ENCENDER LED
 digitalWrite(12, LOW); // REDUCE A 0V EL PIN 12
 delay(1000); // APAGAR LED
 digitalWrite(11, HIGH); // ENVÍA 5V AL PIN 11
 delay(1000); // ENCENDER LED
 digitalWrite(11, LOW); // REDUCE A 0V EL PIN 11
 delay(1000); // APAGAR LED 
}