I’m sure that the devs will have this ironed out once the next stable version of MicroPython is officially released. @Michael how interesting, would it have anything to do with Zachary running through the tutorial for the first time on a fresh install rather than updating Thorny/MicroPython? I wonder whether the update just skipped by the preinstalled array library rather than trying to purge and reinstall or update it which would have caused the issues Zachary was seeing?
@Alan71240 In our last batch of rainbows there is an artwork error on the breakout header where DI and DO labels are swapped - you might have received an email with the specifics already.
Try moving your signal to the pin labelledDO. You can also try connecting your signal to the large Data tab.
I apologise personally for any frustration the error might have caused.
Thanks very much Michael - no worries. That makes a big difference - nice coloured LEDs now It’s OK - I very nearly tried that but easier to ask as I had only soldered a 3-pin header on the board.
I had the array issue as well, but got round it by running the slilghtly modified pimoroni version of micropython, then I found other commands didnt work properly.
Hi Michael
Thanks for the tutorial.
i am using this code to drive a RP2040-Zero from waveshare and I would like to be able to mke the code repeat continuously . I have explored making a numberof changes but nothing works . the module I am using only has 1 rgb led and your code does work but as I said I just want it to repeat ,can you help
cheers
Nick
You will have to put your code in an infinite loop. Something like this will loop indefinitely. All this code is pretty similar to the tutorial. The only difference is the while True: loop at the bottom. I’ve removed some unused functions to make this example as small as possible while still functional.
# Example using PIO to drive a set of WS2812 LEDs forever
import array, time
from machine import Pin
import rp2
# Configure the number of WS2812 LEDs.
NUM_LEDS = 1
PIN_NUM = 22
brightness = 0.2
@rp2.asm_pio(sideset_init=rp2.PIO.OUT_LOW, out_shiftdir=rp2.PIO.SHIFT_LEFT, autopull=True, pull_thresh=24)
def ws2812():
T1 = 2
T2 = 5
T3 = 3
wrap_target()
label("bitloop")
out(x, 1) .side(0) [T3 - 1]
jmp(not_x, "do_zero") .side(1) [T1 - 1]
jmp("bitloop") .side(1) [T2 - 1]
label("do_zero")
nop() .side(0) [T2 - 1]
wrap()
# Create the StateMachine with the ws2812 program, outputting on pin
sm = rp2.StateMachine(0, ws2812, freq=8_000_000, sideset_base=Pin(PIN_NUM))
# Start the StateMachine, it will wait for data on its FIFO.
sm.active(1)
# Display a pattern on the LEDs via an array of LED RGB values.
ar = array.array("I", [0 for _ in range(NUM_LEDS)])
##########################################################################
def pixels_show():
dimmer_ar = array.array("I", [0 for _ in range(NUM_LEDS)])
for i,c in enumerate(ar):
r = int(((c >> 8) & 0xFF) * brightness)
g = int(((c >> 16) & 0xFF) * brightness)
b = int((c & 0xFF) * brightness)
dimmer_ar[i] = (g<<16) + (r<<8) + b
sm.put(dimmer_ar, 8)
time.sleep_ms(10)
def pixels_set(i, color):
ar[i] = (color[1]<<16) + (color[0]<<8) + color[2]
while True:
pixels_set(0, (255,0,0)) # Red
pixels_show()
time.sleep(1)
pixels_set(0, (0,0,0)) # Off
time.sleep(1)
I had previously used Python code on Pi which required complex c driver code and root permissions to provide the tight timing (I have written my own on Pi so understand the difficulties).
This Pico code is simple and seems like magic - it works like a charm.
It’s OK - I very nearly tried that but easier to ask as I had only soldered a 3-pin header on the board.
