const int PIN_LED_AZUL = 12;
const int PIN_LED_VERDE = 2;

void setup() {

  Serial.begin(9600);

  pinMode(PIN_LED_AZUL, OUTPUT);
  pinMode(PIN_LED_VERDE, OUTPUT);

}

void loop() {

  if (Serial.available()) {
    char input = Serial.read();

    if (input == 'v' || input == 'V') {
      digitalWrite(PIN_LED_VERDE, HIGH);
      digitalWrite(PIN_LED_AZUL, LOW);
    }

    if (input == 'a' || input == 'A') {
      digitalWrite(PIN_LED_VERDE, LOW);
      digitalWrite(PIN_LED_AZUL, HIGH);
    }
  }

  delay(500);

}