# ------------------------------------------------------------
#  Bai 4 - Dem so lan nhan nut
#  Phan cung: GPIO4 -> nut nhan -> GND
#             GPIO23 -> dien tro 220 ohm -> LED -> GND
# ------------------------------------------------------------
from machine import Pin
import time

# ===== CẤU HÌNH =====
CHAN_NUT = 4              # nut nhan
CHAN_LED = 23             # den bao da ghi nhan
CHONG_DOI = 200           # ms - bo qua nhieu tiep diem sau moi lan nhan
# ====================

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

so_lan = 0
truoc_do = False          # nut co dang duoc nhan o VONG TRUOC khong

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

    # Chi lam viec o dung KHOANH KHAC nut chuyen tu nha sang nhan
    if dang_nhan and not truoc_do:
        so_lan = so_lan + 1
        print("So lan nhan:", so_lan)

        # Nhay dung bang so lan da nhan -> doc duoc so dem MA KHONG CAN man hinh
        for _ in range(so_lan):
            led.on()
            time.sleep_ms(200)
            led.off()
            time.sleep_ms(200)

        time.sleep_ms(CHONG_DOI)

    truoc_do = dang_nhan
    time.sleep_ms(10)