from machine import ADC, Pin
from neopixel import NeoPixel
import time

ADC_PIN = 14
LED_PIN = 27
LED_COUNT = 16

adc = ADC(Pin(ADC_PIN))
adc.atten(ADC.ATTN_11DB)

np = NeoPixel(Pin(LED_PIN, Pin.OUT), LED_COUNT)

def get_brightness(adc_value):
    if adc_value <= 1365:
        return 0
    elif 1365 < adc_value <= 2730:
        return 128
    else:
        return 255

while True:
    raw = adc.read()
    brightness = get_brightness(raw)
    color = (brightness, brightness, brightness)
    for i in range(LED_COUNT):
        np[i] = color
    np.write()
    print("ADC值: {} | 亮度等级: {}".format(raw, brightness))
    time.sleep(0.1)