from machine import Pin
import time

##Definicion de pines
pulsador=Pin(34, Pin.IN,) 
led=Pin(2, Pin.OUT)                  

while True:
    while pulsador.value()==0:
        pass  
    while pulsador.value()==1:
        pass  
    print("Iniciando conteo regresivo de 20 segundos")
    for i in range(20, 0, -1):
        print(i)
        time.sleep(1)
    led.value(1)
    print("LED encendido")