"""ADC slider demo — drag the sliders that appear under the editor.

Two simulated ADCs:
  * pin 34 — sets the base hue of a rainbow
  * pin 35 — sets overall brightness

The strip lights up while the script runs; the values update live (no need to
restart the script when you move the slider).
"""

import time

from machine import ADC, Pin
from neopixel import NeoPixel


NUM_LEDS = 16
strip = NeoPixel(Pin(5, Pin.OUT), NUM_LEDS)

hue_pot = ADC(Pin(34))
bri_pot = ADC(Pin(35))


def hsv_to_rgb(h, s, v):
    h = h - int(h)
    i = int(h * 6)
    f = h * 6 - i
    p = v * (1 - s)
    q = v * (1 - f * s)
    t = v * (1 - (1 - f) * s)
    if i == 0:
        r, g, b = v, t, p
    elif i == 1:
        r, g, b = q, v, p
    elif i == 2:
        r, g, b = p, v, t
    elif i == 3:
        r, g, b = p, q, v
    elif i == 4:
        r, g, b = t, p, v
    else:
        r, g, b = v, p, q
    return int(r * 255), int(g * 255), int(b * 255)


print("Move the ADC sliders below the editor while this runs.")

while True:
    base_hue = hue_pot.read_u16() / 65535
    brightness = bri_pot.read_u16() / 65535
    for i in range(NUM_LEDS):
        h = (base_hue + i / NUM_LEDS) % 1.0
        strip[i] = hsv_to_rgb(h, 1.0, brightness)
    strip.write()
    time.sleep(0.04)