I was driving past one of those led advertising signs sitting on the side of the road the other day and thought to myself ‘I can do that’
So I’ve hooked up 6 of the freetronics DMD modules (in a 2x3 layout) and got down to coding up a way to do it.
In the end I got it working by adding support for multiple buffers into my DMD library - github.com/cjd/DMD
Since I have the ability to have multiple buffers I can now transition between buffers presentation-style.
There are 8 transitions - wipe left/right/up/down, box in/out and cross in/out
The following video demonstrates some of the transitions
It is my sons first birthday in a few days so I thought it nice to create a moving sign for his party :)
[youtube_sc url=“s4Qjski-WMY”]
For the hardware I mounted the displays on a wooden frame (hold on by hot-glue) and then routed power down each side and signal was daisy-chained from bottom-right (bottom-left in photo) to each display.
Source code below:
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