from time import sleep
from machine import Pin

sleep(0.1) # Wait for USB to become ready

led=Pin(0,Pin.OUT)
button=Pin(28,Pin.IN,Pin.PULL_UP)

while 1:
    state=button.value()
    if state==0:
        led.value(1)
    elif state==1:
        led.value(0)
    sleep(0.1)