Some CircuitPython to control an RGBW LED strip.

RGB_strip_control.py

"""
Simple CircuitPython control of an RGB strip via Mosfetti or plain MOSFETS.

Copyright (c) 2023 George White <stonehippo@gmail.com>

Written for the Adafruit Metro M0, but will work with any board with
4 PWM-capable pins.
"""
import board
from pwmio import PWMOut
from time import sleep

# Each color is on a single pin and is applied to the whole strip.
green = PWMOut(board.D3)
red = PWMOut(board.D4)
blue = PWMOut(board.D5)
white = PWMOut(board.D6)

# Convenience levels. You can use any value from 0-65535.
OFF=0
HALF= 2 ** 15
FULL = 2 ** 16 - 1

# Set a single cooler at a given level
def set_light(light, val):
    light.duty_cycle = val


"""
blend() is a universal control function. It can take a list of lights 
(it could use a tuple, too, but this breaks enumeration with a single
light), and a level that gets applied to all of the list LEDs.

Using a combination of calls to blend, you can set any color and level
you might desire.
"""
def blend(lights=(red,green,blue,white), level=OFF):
    [set_light(l, level) for l in lights]

def all_off():
    blend()

def all_on():
    blend(level=HALF)

def fade(steps=64, direction=True, min=OFF, max=(FULL+1)):
    r = range(min, max, int((max)/steps))
    if direction:
        for i in r:
            blend(level=i)
            sleep(0.05)
    else:
        for i in reversed(r):
            blend(level=i)
            sleep(0.05)