#define BOTAO 12
#define LED 2
int val = 0;

void setup() {
  pinMode(BOTAO, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
}

void loop() {
  val = digitalRead(BOTAO);
  if (val == 0){
    digitalWrite(LED, HIGH);

  } else {
    digitalWrite(LED, LOW);
  }
}