bool estado;
unsigned long tiempo;
unsigned long reloj;

//Felices fiestas!!

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(33, OUTPUT);
  pinMode(32, INPUT_PULLUP);
  pinMode(18, INPUT);
  estado = false;
}

void loop() {
  // put your main code here, to run repeatedly:
  if((digitalRead(32)==LOW)||(digitalRead(18)==HIGH)){
    tiempo= millis()+3000;
  }

  reloj= millis();

  if(tiempo>reloj){
    estado= true;
    Serial.println(tiempo-reloj);
  }
  else
  estado= false;

  if(estado==true)
    digitalWrite(33, HIGH);
    else
    digitalWrite(33, LOW);
  
}