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Glitchy Flickering LEDs on LED Matrix
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Re: Glitchy Flickering LEDs on LED Matrix

by xsk8rat on Fri May 14, 2021 12:47 pm

Glitchy Presentation: (eg. top left static)

LED Matrix Product: #2278 (64x32 4mm)

Controller: Matrix Portal M4

Example Code: (CircuitPython)
https://learn.adafruit.com/network-connected-metro-rgb-matrix-clock

Bootloader Version: Not Applicable

Library version for RGBmatrixPanel: 2020-11-18
Adafruit CircuitPython 6.0.0 on 2020-11-16; Adafruit Matrix Portal M4 with samd51j19

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Re: Glitchy Flickering LEDs on LED Matrix

by mikeysklar on Mon May 17, 2021 11:28 am

xsk8rat,

Thank you for the details of your setup.

Let's get you on CircutPython 6.2.0 with the latest libs. I was getting a ton of refresh noise on some OLEDs untill I upgrade to 6.2.0.

https://circuitpython.org/board/matrixportal_m4/

Please make sure you updatet he lib folder with the necessary libraries from the 20210514 drop.

https://circuitpython.org/libraries

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Re: Glitchy Flickering LEDs on LED Matrix

by xsk8rat on Tue May 18, 2021 9:08 am

Thank You!
I will get on that update. It was weird that it started after a couple months (out of warrantee :^D).
Appreciate you looking at this and letting me hitch a ride on the thread. Very grateful.
Mark

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Re: Glitchy Flickering LEDs on LED Matrix

by keenest on Tue May 18, 2021 7:47 pm

mikeysklar wrote:Since there are multiple folks on this thread with similar hardware would you each mind summarizing your setups so we can determine if this is a hardware, firmware, library or example code code issue.

LED Matrix Product: #2279 (64x32 3mm)
64x32 Flexible RGB LED Matrix - 5mm Pitch PID: 3803

Glitchy Presentation: (eg. top left static)
top left static, only when much of the screen is lit up. A single small image in the top left is ok.

Controller: ( Uno, Metro M4, etc.)
Matrix Portal

Example Code: (script name)
https://learn.adafruit.com/pixel-art-matrix-display

Bootloader Version:

Arduino or CircuitPython:
CircuitPython

Library version for RGBmatrixPanel:
adafruit-circuitpython-bundle-6.x-mpy-20210414


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Re: Glitchy Flickering LEDs on LED Matrix

by mikeysklar on Wed May 19, 2021 4:48 pm

We are running out of options for what to look at on these.

A 4A power supply is sufficient to run these. I would have thought it was a power issue with the description of how it works until a lot of LEDs are being driven. I suppose you could try a larger 10A supply, but it should not be necessary as these displays are being charlieplexed.

It also is plausible that there is a loose connection that is carrying over between units. There have been other reports so the issue is looking like something on our side that I will be escalating to engineering.

What do you see when running simpletest? A UF2 you can drop onto your MatrixPortal

https://learn.adafruit.com/adafruit-mat ... /downloads

Please post a photo of the simpletest results.

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Re: Glitchy Flickering LEDs on LED Matrix

by winston45 on Thu May 20, 2021 11:41 pm

Hi, I hope this is the right place to post this.

I did a project with an M4 Matrix Portal (64x32 RGB LED Matrix - 4mm pitch[ID:2278]) worked out so great a friend asked me for a duplicate, I ordered a second LED panel (64x32 Flexible RGB LED Matrix - 5mm Pitch[ID:3803]) and am seeing LED flicker.
Using the same Matrix Portal in both cases: (Adafruit Matrix Portal - CircuitPython Powered Internet Display[ID:4745])

I have swapped power suppliers and computers (The code is identical on each).
Problem remains with the display.
I am using Circuit Python (6.2.0)

Ideas?

Here's a link to a video showing the problem:
https://photos.google.com/photo/AF1QipM ... QXOacT7Akt

Display.png
Display.png (317.69 KiB) Viewed 227 times

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Re: Glitchy Flickering LEDs on LED Matrix

by keenest on Fri May 21, 2021 7:02 am

mikeysklar wrote:
It also is plausible that there is a loose connection that is carrying over between units. There have been other reports so the issue is looking like something on our side that I will be escalating to engineering.

What do you see when running simpletest? A UF2 you can drop onto your MatrixPortal

https://learn.adafruit.com/adafruit-mat ... /downloads

Please post a photo of the simpletest results.


Will test shortly. I would be happy to try a rigid traditional display vs the 2 flexible units I have now received. Would it be useful to send one of them back to you for analysis?

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Re: Glitchy Flickering LEDs on LED Matrix

by mikeysklar on Fri May 21, 2021 12:16 pm

@winston45 - Your issue sounds / looks different please start a new thread so we can help you troubleshoot the shift from 4mm to 5mm.

@keenest - Please let us know the resutls of simpeltest.uf2.

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Re: Glitchy Flickering LEDs on LED Matrix

by keenest on Sat May 22, 2021 2:35 pm

Here are the results from the test code.

https://photos.app.goo.gl/ZesTK59Kbsju8gn99

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Re: Glitchy Flickering LEDs on LED Matrix

by mikeysklar on Sun May 23, 2021 4:35 pm

@keenest,

Thank you for the video and running the simpletest. The matrix does look a bit glitchy and difficult to read from the video you provided.

How would you like to proceed? We have already replaced the panel. I take it we have not replaced the MatrixPortal M4? Would that be the next logical step.

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Re: Glitchy Flickering LEDs on LED Matrix

by keenest on Tue Jun 01, 2021 9:29 am

@mikeysklar, I'm open to trying a new Matrix Portal. I'm happy to send back one of the panels too if that helps you troubleshoot any manufacturing issues that may be common between the two panels I received. Would it make sense for me to test a rigid panel instead of the flexible? I do not have a need for the flexible - mostly ordered it thinking it might be useful in a project vs the rigid.

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Re: Glitchy Flickering LEDs on LED Matrix

by mikeysklar on Tue Jun 01, 2021 11:26 am

@keenest,

I tried to summarize this thread for engineering and sent in a post along with another case. It's a mess since we have three people on this with mutliple models of panel. Is it only the the flexible panel 64x32 5mm that has shown glitch signs or are you seeing it on any of the rigids you have used?

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Re: Glitchy Flickering LEDs on LED Matrix

by adafruit2 on Thu Jun 03, 2021 5:41 pm

im somewhat mystified by what this could be - however i *think* its the driver not the matrix

@xsk8rat can you try the test UF2 as well, do you get the same?

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Re: Glitchy Flickering LEDs on LED Matrix

by keenest on Fri Jun 04, 2021 8:51 pm

mikeysklar wrote:@keenest,
Is it only the the flexible panel 64x32 5mm that has shown glitch signs or are you seeing it on any of the rigids you have used?


I only have the flexible 64x32 5mm. Willing to test a rigid LED panel if you want to ship me one. I'm happy to send you back a flexible display too.

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Re: Glitchy Flickering LEDs on LED Matrix

by adafruit2 on Fri Jun 04, 2021 11:33 pm

i dont believe it is related to flex/rigid because multiple folks are seeing it
keen - does it matter what power supply you use?

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