a library for using WS2812b leds (aka neopixels) with Raspberry Pi Pico

Related tags

Hardware pico_python_ws2812b
Overview

pico_ws2812b

a library for using WS2812b leds (aka neopixels) with Raspberry Pi Pico

neopixels in action

You'll first need to save the ws2812b.py file to your device (for example, open it in Thonny and go file > save as and select MicroPython device. Give it the same name). Once it's there, you can import it into your code.

You create an object with the parameters number of LEDs, state machine ID and GPIO number in that order. so, to create a strip of 10 leds on state machine 0 and GPIO 0, you use:

pixels = ws2812b.ws2812b(10,0,0)

This object has two methods, show() which sends the data to the strip, and set_pixel which sets the colour values for a particular LED. The parameters are LED number, red, green, blue with the colours taking values between 0 and 255.

At the moment, this isn't working with the interpreter, so you have to run it from a file. Looks like it's running just too slow to keep up with the PIO buffer from the interpreter. The key methods are set_pixel(r,g,b), set_pixel_line(p1, p2, r, g, b) which sets a row of pixels from pixel p1 to pixel p2 (inclusive), and fill(r,g,b) which fills all the pixels with the colour r,g,b.

pixels.set_pixel(5,10,0,0)
pixels.set_pixel_line(5,7,0,10,0)
pixels.fill(20,5,0)

Pull requests are open if you'd like more features!

Comments
  • No output on GPIO when using this lib, but okay when using a simple test program

    No output on GPIO when using this lib, but okay when using a simple test program

    I have tried your library, but there is no output (checked with a scope) on the GPIO pin, however all is fine when using this test program:

    from machine import Pin
from rp2 import PIO, StateMachine, asm_pio

@asm_pio(set_init=PIO.OUT_LOW)
def square():
    wrap_target()
    set(pins, 1)
    set(pins, 0)
    wrap()
    
sm = rp2.StateMachine(0, square, freq=2000, set_base=Pin(2))

sm.active(1)

    The test program for your library looks like this:

    import ws2812b
import time

i = 0
di = 1
pixels = ws2812b.ws2812b(64,0,2)
while True:
    if i > 20 or i < 0:
        di = -di
    pixels.fill(i,i,i)
    time.sleep(0.05)
    i = i + di

    Attaching a 8x8 LED array leads to nothing, probing GPIO2 with my scope also shows nothing, in contrast to the first test program. I had a look at the library code, but it looked fine to me, however I am new to the Pico, so can't really say much about it.

    opened by root42 4
  • num_leds not referenced for i and j

    num_leds not referenced for i and j

    In the following file, instead of referencing num_leds, the value for i and j is fixed to 30: https://github.com/benevpi/pico_python_ws2812b/blob/226330d7b1b140c7d462da958809714384ffb3fb/examples/flash.py#L4-L9

    Thanks! Martin

    opened by Martin-HiPi 2
  • Add .fill in the Readme

    Add .fill in the Readme

    Add in the Readme that pixels.fill(r,g,b) will fill the whole Strip!

    But i really Love the Work. Only working with PIO seems so useless with micropython ;)

    opened by P-C-R 1
  • mixed Green and Blue in leds1.set_pixel(x,a,b,c)

    mixed Green and Blue in leds1.set_pixel(x,a,b,c)

    When I use leds1.set_pixel it is leds1.set_pixel(x,Red,Blue,Green) instead of usual and documentred Red, Green Blue. In leds1.fill(i,i,i) is OK.

    opened by lamasek 2
  • I did a little bit of playin around

    I did a little bit of playin around

    I'm sorry, I'm VERY new to all this git hub stuff (I only recently rediscovered coding) so, if this is an inappropriate way to share my experiment, I'm sorry, send assassins to my home.

    Anyway, I'm getting better at Python and thought I'd have a look at your library.

    https://github.com/IanSMoyes/SpiderPi/blob/master/Lights/RPi_Pico/code/NeopixelPIO.py

    I ported a couple of lines for CircuitPython instead of MicroPython (I prefer it), added support for GRB and RBGW LEDs, added support for autoshow & some general personal preference stuff.

    I'm not sure if you can pass "pull_thresh" to "rp2.asm_pio" as a variable. If so, it would take out a LOT of repetition I added to accommodate the 4 colour lights.

    I haven't been able to try it yet but. I'd love to hear your comments & feedback.

    Thanks for all your hard work.

    opened by IanSMoyes 0
  • Weird results in interactive mode

    Weird results in interactive mode

    Sometimes I'm getting weird results when using the interactive REPL. No idea why. I'm investigating. I've just put this issue here incase anyone else comes across it.

    opened by benevpi 3
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