from machine import Pin
from time import sleep_ms

led=Pin(2,Pin.OUT)
key=Pin(0,Pin.IN,Pin.PULL_UP)
state=0

def on_falling():
    global state
    sleep_ms(10)

    if(key.value()==0) #key를 누르면
        state=not state
        led.value(state)

key.irq(on_falling, Pin.IRQ_FALLING)