int pinBoton = 2;

bool boton = LOW;

void setup() {
  Serial.begin(115200);
  pinMode(pinBoton, INPUT);
}

void loop() {
  boton = digitalRead(pinBoton);

  if (boton == HIGH) {
    delay(150);
    Serial.println("Boton presionado");
  } else {
    delay(150);
    //Serial.println("El boton NO esta presionado");
  }

  while (Serial.available() > 0) {
    char caracter = Serial.read();

    if (caracter >= 'a' && caracter <= 'z') {
      caracter -= 32;
    }else{
      Serial.print("Caracter no valido!!");
    }
    Serial.print(caracter);
  }
delay(500);
}