from machine import Pin
from time import sleep_ms

button = Pin(14, Pin.IN, Pin.PULL_UP)
led = Pin(16, Pin.OUT)

#while True:
#    led.value(button.value() != 0)
#    sleep_ms(20)

while True:
    a=button.value() # read button state
    led.value(not a )  # give output to led
    print(a,led.value())
    sleep_ms(500)