from machine import Pin
import time

led = Pin(15, Pin.OUT)
button = Pin(14, Pin.IN, Pin.PULL_UP)

trang_thai_led = False
ttnutnhan_cuoi = 1

while True:

    ttnutnhan_hientai = button.value()

    if ttnutnhan_cuoi == 1 and ttnutnhan_hientai == 0:
        trang_thai_led = not trang_thai_led
        led.value(trang_thai_led)
        time.sleep(0.2)  # chống dội phím

    ttnutnhan_cuoi = ttnutnhan_hientai
    time.sleep(0.02)