Multiplexing for non-standard panel: 104*52 res, 1/13 scan rate, 320mm * 160mm LED Panel about rpi-rgb-led-matrix HOT 9 CLOSED

Update: Fixed it. Turns out the mapper required for this panel was a form of the ZnMirrorZStripe multiplexing pattern, just with a larger tile_height.

Marking this as closed.

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@andytheengineerguy Can you share what you did to make this panel work? I believe I have the same panel and am struggling to get it to display properly.

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hi @bsparacino, sure, happy to help.

I found out (with no help from the suppliers or the non-existant datasheet.. 😂!) that the panel almost worked with a ZStripeMultiplexMapper configuration, with even- and odd- block offsets set to 4. But the height was still funky (as shown in the screenshot of my original message).

To fix this, the tile_height needs to be 13 (not 4, which is the original value), as shown:

So...

1. Change height to 13
2. Register a new multiplexer mapper
3. Re-make the codebase
4. Run the rotating square demo using --led-multiplexing=19

Once you've confirmed this solution actually works, I'd recommend modifying the ZStripeMultiplexMapper class in order to preserve the existing mappings that depend on it. I achieved this by adding the width and height as variables that you pass into the constructor. So then we can pass our new height of 13 while still utilizing the existing ZStripeMultiplexMapper class.

When you do this, don't forget to update all the other registrations with their default tile sizes (8 and 4)

Come to think of it I will probably do a PR for this change.

Good luck, lmk how you go.

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What parameters are you using to run the demo? When I run it with multiplexing 5 it is similar to your initial image. But with your code added I am not ending up with the corrected image.

./examples-api-use/demo -D 0 --led-gpio-mapping=adafruit-hat --led-cols=104 --led-rows=52 --led-row-addr-type=0 --led-multiplexing=19

./examples-api-use/demo -D 0 --led-gpio-mapping=adafruit-hat --led-cols=104 --led-rows=52 --led-row-addr-type=0 --led-multiplexing=5

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Hmm. Strange. Your panel looks the same in terms of specs (resolution, scan rate, size) but the physical construction is definitely different than mine. Different locations of the IDC connector (maybe different LED driver chips?) etc.

We are using different electronics. I'm using an RPi4 with an active-3 hat from electrodragon.

I just ran the demo with the following and it worked ./demo -D 0 --led-gpio-mapping=regular --led-cols=104 --led-rows=52 --led-slowdown-gpio=4 --led-row-addr-type=0 --led-multiplexing=19

Just re-ran the 5 pattern, we are definitely getting similar results for 5 ./demo -D 0 --led-gpio-mapping=regular --led-cols=104 --led-rows=52 --led-row-addr-type=0 --led-multiplexing=5 --led-slowdown-gpio=4

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I have not used the adafruit hat before. The only other thing I can think of right now is the connector type - is it HUB75 or HUB75E? If it's E, you might need to enable the E line with some soldering/jumpers on the hat (I needed to do that with different 128*64 panels I brought up using this library)

But for these 104*52s specifically, they are regular HUB75s, so I didn't need to worry about it.

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About 20min ago I actually soldered the E line on the hat which resulted in the photos I posted, before I did that it was a total mess.

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Well I must have different modules, this function solved it for me
#1499 (comment)

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Out of curiosity I just tried the mapper from #1499 (comment) and got a similar vertically-jumbled pattern to what you started with. So, yep, different panels indeed. At least its consistent:

Well, glad you got yours working, and good to know that if I ever need an alternative for these 1/13, 104*52 panels, I know which mapping to use 💪

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