from machine import Pin
from time import sleep
led = Pin(20, Pin.OUT)
button = Pin(21, Pin.IN, Pin.PULL_DOWN)
while True:
led.value(button.value())
sleep(0.1)
print(button.value())
Using GPIO-0 because (onboard) LED does not work
from machine import Pin
from time import sleep
led = Pin(20, Pin.OUT)
button = Pin(21, Pin.IN, Pin.PULL_DOWN)
while True:
led.value(button.value())
sleep(0.1)
print(button.value())