from machine import Pin
from utime import sleep

led = Pin(10, Pin.OUT)
sw = Pin(21, Pin.IN, Pin.PULL_UP)

while True:
	if sw.value() == 0:
		led.value(1)
		print(sw.value())
		sleep(0.1)
	else:
		led.value(0)
		print(sw.value())
		sleep(0.1)