void setup() {
  pinMode(5, INPUT_PULLUP);
  lcd.begin(16, 2)
  lcd.print("Clase MicroControladores");
}

void loop() {
  sw = digitalRead(5);
  lcd.setCursor(0,1);
  lcd.print("Segundos");
  lcd.print(millis()/1000);
  lcd.display();

  if (sw == 0){
    lcd.clear();
    lcd.print("Interruptor off");
    delay(1000);
    lcd.noDisplay();

  }
  else {
    lcd.display();
    lcd.clear();
    lcd.setCursor(0, 1);
    lcd.print("Interruptor on");
    delay(1000);

  }

}