#define BUTTON 27
#define LED 18

int press_button = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Ola, humano!");

  pinMode(LED, OUTPUT);
  pinMode(BUTTON, INPUT_PULLUP);

}

void loop() {

//realiza leitura do estado do butao
press_button = digitalRead(BUTTON);

//Pode se utiliza o HIGH ou 1 
if(press_button == HIGH){
  Serial.println("\n Pull-up ativo, Led Ligado...");
  digitalWrite(LED, HIGH);
} 
else {
  Serial.println(" Enquanto botao estiver presionado, o Led ira apagar...");
  digitalWrite(LED, LOW);
}

  delay(1000); // this speeds up the simulation
}