//"trava" e "destrava" de entrada

const int rele_Pin = 2;

boolean tranca = false;

void setup() {

  pinMode(rele_Pin, OUTPUT);

  Serial.begin(115200);
  Serial.println("");
}

void loop() {
  if (Serial.available()) {
    String message = Serial.readString();

    if (message == "trava\n") {
      tranca = true;
      digitalWrite(rele_Pin, HIGH);
      Serial.println("Tranca travada");
    }

    else if (message == "destrava\n") {
      tranca = false;
      digitalWrite(rele_Pin, LOW);
      Serial.println("Tranca destravada");
    }
  }
  delay(10); // this speeds up the simulation
}