int led_roja = 12;
int led_azul = 10;

void setup() {

  pinMode(led_roja, OUTPUT);
  pinMode(led_azul, OUTPUT);
}

void loop() {

  digitalWrite(led_roja, HIGH);
  delay(250);
  digitalWrite(led_roja, LOW);
  delay(250);
  digitalWrite(led_azul, HIGH);
  digitalWrite(led_roja, HIGH);
  delay(250);
  digitalWrite(led_roja, LOW);
  delay(250);
  digitalWrite(led_azul, LOW);
  delay(250);
}