# ------------------------------------------------------------
#  Bai 2 - Dieu khien LED bang nut nhan
#  Phan cung: GPIO4 -> mot chan nut -> chan con lai -> GND
#             GPIO23 -> dien tro 220 ohm -> chan dai LED -> GND
# ------------------------------------------------------------
from machine import Pin
import time

# ===== CẤU HÌNH =====
CHAN_NUT = 4              # nut nhan cam o GPIO4
CHAN_LED = 23             # LED cam o GPIO23
THOI_GIAN_NGHI = 50       # ms - bao lau doc lai nut mot lan
# ====================

nut = Pin(CHAN_NUT, Pin.IN, Pin.PULL_UP)
led = Pin(CHAN_LED, Pin.OUT)

while True:
    dang_nhan = nut.value() == 0

    if dang_nhan:
        led.on()
    else:
        led.off()

    time.sleep_ms(THOI_GIAN_NGHI)