void setup() {
pinMode(LED_BUILTIN, OUTPUT);
Serial.begin(38400);
desligaled();
}

void loop() {
if(Serial.available() > 0){
char leu = Serial.read();
if (leu == ‘d’){
desligaled();
}
if (leu == ‘l’){
ligaled();
}
if (leu == ‘o’){
outra();
}
}
}

void desligaled(){
digitalWrite(LED_BUILTIN, LOW);
Serial.println(“Desliguei o LED”);
}

void ligaled(){
digitalWrite(LED_BUILTIN, HIGH);
Serial.println(“Liguei o LED”);
}

void outra(){
Serial.println(“resposta ao outro comando”);
}