# =======================================================
# ESP32 - PWM + ADC + BUTTON (PULL-DOWN)
# =======================================================

from machine import Pin, ADC, PWM
import time

# --- KHAI BÁO CHÂN ---
led = PWM(Pin(2))           # LED PWM
led.freq(1000)              # tần số PWM

pot = ADC(Pin(34))          # biến trở
pot.atten(ADC.ATTN_11DB)    # đọc full 0–3.3V (0–4095)

button = Pin(14, Pin.IN, Pin.PULL_DOWN)  # pull-down nội

# --- BIẾN TRẠNG THÁI ---
led_state = False
last_btn = 0

last_debounce_time = 0
debounce_delay = 200  # ms

while True:

    btn = button.value()

    # --- PHÁT HIỆN NHẤN (0 → 1) + DEBOUNCE ---
    current_time = time.ticks_ms()

    if (btn == 1 and last_btn == 0 and
        time.ticks_diff(current_time, last_debounce_time) > debounce_delay):

        led_state = not led_state
        last_debounce_time = current_time

    last_btn = btn

    # --- ĐIỀU KHIỂN LED ---
    if led_state:
        val = pot.read()  # 0–4095

        # scale về 0–65535 cho PWM
        duty = int(val * 65535 / 4095)

        led.duty_u16(duty)
    else:
        led.duty_u16(0)

    time.sleep_ms(10)