#define EN_SERIAL 15

bool serialEnabled = false;
bool fallingEdge = false;

void setup() {
  pinMode(EN_SERIAL, INPUT_PULLUP);
}

void loop() {
  static uint32_t pTime;
  if (millis() - pTime >= 1000) {
    pTime = millis();
    Serial.printf("Sono trascorsi %d millisecondi\n", millis());
  }

  if (digitalRead(EN_SERIAL) && !serialEnabled) {
    serialEnabled = true;
    Serial.begin(115200);
    Serial.println(" ");
  }

  if (!digitalRead(EN_SERIAL) && serialEnabled) {
    serialEnabled = false;
    Serial.flush();
    Serial.end();
  }


  delay(10); // this speeds up the simulation
}