from machine import Pin
from utime import sleep
led = Pin(5, Pin.OUT)
sw=Pin(4,Pin.IN)
count = 0
while True:
    print(sw.value())
    if sw.value() == 0:
        count+=1
        if count % 2 == 1:
            led.on()
        else:
            led.off()
    sleep(0.5)