VHS LED Wall documentation

There is numerous posts about the LED wall.

And two projects on github that I could find about the LED wall.

None of these posts or repositories have any documentation on how its set up. VHS seems to be allergic to documentation sometimes. I tried connecting power to the current set up. The Raspberry pi and the Teency both powered up but the LEDs didn’t blink. :frowning:


I wrote some code and started making some documentation on the LED wall. I made my OWN repository (we have three now, for the people are keeping track) and got the LED wall up and running. There is nothing to set up you just flip a switch and it will turn on. I did NOT disturbe anything with the current set up, I did NOT rewire anything or change anything that other people were working on. I just unplugged the RJ45 and plugged it into my own connector.

https://instagram.com/p/9znts8A5Un/?taken-by=funvill
Click for video ^^

There is two reasons that the top right two panels aren’t working. There is a wring issue with the panels that needs to be resolved AND the Arduino I have does not have enough memory for all the LEDS on the entire wall while using DMA, there are other methods to by pass the memory problem.

All the documentation is written in a dead tree book that I left at VHS tonight (oops), I will take photos and update this post and MY repositories with documentation and example code.

I am planning on using this with the LED workshops that I have been running as a example project. After the next workshop I will host a hack the wall night to get people started with it.

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The Teensy should have enough memory.

You are absolutely correct, I didn’t want to modify anyone else’s project that was using the teensy. Is the teensy yours? Is the Raspberry PI yours? I will label it for you.

With your permission I can update the teensy with a default sketch that is pretty and auto runs. When plugged in.

I am planning on using the wall in arduino workshops, everyone that uses an arduino will also hit this memory problem. I can show people how to work around this problem.

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The LED strips is WS2812 800mhz version. (These are NOT the “B” variant, Not WS2812b)

Each panel has 8x8 LEDs (Total 768 LEDs )
There are 3 rows, 4 columns of panels, totaling 12 panels.

Each row has its own data cable controlling 4 panels (256 LEDs).The data cable is mapped from the top left of the panel, continues downwards, one right, then up, continuing until it reaches the top right of the panel.

  • Pin 2 solid green on the ethernet cable is connected to the top data cable and is labeled Y15-B14
  • Pin 4 solid blue on the ethernet cable is connected to the middle data cable and is labeled Y13-B12.
  • Pin 6 solid orange on the ethernet cable is connected to the bottom data cable and is labeled Y11-B10.
  • Pin 1,3,5,7 the stripped wires on the Ethernet cable are connected to each other and to ground.
  • Pin 8 solid brown wire is not connected.

I am not sure what the labels (Y15-B14, Y13-B12, Y11-B10) on the data pins refer to.

image

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