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Hi, not posted before but I thought some of you might like to see this setup that I've been playing with;

https://www.youtube.com/watch?v=gaacP4N1ew4

It's running on four 64x64 LED matrices, I think it looks pretty nice. The flicker/scan lines in the video aren't visible in person, it's an effect of the camera - but I may try tweaking the refresh to make a better video.

P#78410 2020-06-22 22:47

That's fantastic.

P#78467 2020-06-24 16:34

Now THAT'S a Pico-8 screen!

P#78472 2020-06-24 19:36
1

It's bright and vivid, makes pico-8 stuff look great. It's a shame I can't capture it very well on video. The 128x128 resolution is just perfect :)

There's not much else around that will display so well on such a small panel. Even the gameboy resolution was 160x144.

P#78475 2020-06-24 21:03

What's the ultimate plan for this project?

Hang it on a wall? Arcade cabinet?

P#78482 2020-06-25 03:18

I love this big time. I've wanted to do this for ages. Please tell us which panels you used and how to connect them? I see from your video they are wired into the GPIO pins which I understand probably means you're using SPI to send the framebuffer to the panels. I also assume the panels need independent power (5v? like the Pi?). Please do tell!!

P#78483 2020-06-25 05:35

Yeah the panels are connected directly to the Pi GPIO pins using Dupont wire, in the same way as this guide https://github.com/hzeller/rpi-rgb-led-matrix/blob/master/wiring.md. I was planning on using this adapter board https://www.electrodragon.com/product/rgb-matrix-panel-drive-board-raspberry-pi/ but it hasn't arrived yet from HK.

It's wired in a U-shape like this https://github.com/hzeller/rpi-rgb-led-matrix/tree/master/examples-api-use#remapping-coordinates

The panels need a 5V supply, I'm using this https://www.amazon.co.uk/Universal-Adapter-Voltage-Charger-Supply/dp/B07W4B7HMS/ref=sr_1_3 but it's not really beefy enough.

I'm using a frame buffer copy based on https://github.com/hzeller/rpi-rgb-led-matrix to drive the panels, I'll see if I can find a link for it.

I got the panels from AliExpress, any of the HUB75 panels should work https://www.aliexpress.com/wholesale?catId=0&initiative_id=AS_20200625012758&SearchText=64x64+rgb+led+matrix

The plan is to build some kind of enclosure, either mini arcade style or retro terminal style like this;

But I'll have to improve by 3d modelling/printing skillz first!

P#78486 2020-06-25 09:34 ( Edited 2020-06-25 09:35)

Hi, I'm currently planning on building one of these matrix-panel-based displays too.
So I'd have some questions:

  • From your last post it's not clear how you get the PICO-8/RPi picture to the matrix panels. You mentioned some kind of "frame buffer copy". I'd imagine some kind of FlaschenTaschen-Server in combination with vlc and ffmpeg behind this? Could you describe this step, as I think it's the hardest part?

  • You mentioned that the electrodragon adapter board hadn't arrived at the time of posting. But how did you get the whole thing running then? Why would you need that adapter board if it runs without?

It would really be awesome if you could share all the details how to build and drive such displays without having a HDMI video wall controller and sender/receiver cards.

P#96289 2021-08-20 23:58 ( Edited 2021-08-20 23:58)

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