import time
import machine
time.sleep(0.1) # Wait for USB to become ready

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

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