CircuitPy neopixel color dial

main.py

import math
import board
import neopixel
import analogio
import time
from simpleio import map_range


NEOPIXEL_PIN = board.D5
NEOPIXEL_COUNT = 20
NEOPIXEL_ORDER = neopixel.GRB

BRIGHTNESS_PIN = board.A2
HUE_PIN = board.A1

brightness_pin = analogio.AnalogIn(BRIGHTNESS_PIN)
brightness_range = (128, 65520)
hue_pin = analogio.AnalogIn(HUE_PIN)
hue_range = (128, 65520)


def hsv_to_rgb(hue, saturation, value):
    i = math.floor(hue * 6)
    f = hue * 6 - i
    p = value * (1 - saturation)
    q = value * (1 - f * saturation)
    t = value * (1 - (1 - f) * saturation)

    red, green, blue = [
        (value, t, p),
        (q, value, p),
        (p, value, t),
        (p, q, value),
        (t, p, value),
        (value, p, q),
    ][int(i % 6)]

    return red, green, blue


with neopixel.NeoPixel(
        NEOPIXEL_PIN,
        NEOPIXEL_COUNT,
        pixel_order=NEOPIXEL_ORDER,
        auto_write=False) as pixels:
    while True:
        hue = map_range(hue_pin.value, hue_range[0], hue_range[1], 0, 1)
        rgb = [round(v * 255) for v in hsv_to_rgb(hue, 1, 1)]
        # print(hue, rgb)
        pixels[::] = [rgb] * 20
        pixels.brightness = (map_range(brightness_pin.value, brightness_range[0], brightness_range[1], 0, 1))
        pixels.show()
        time.sleep(.125)