I really started to use this while at work and found it really useful but there weren't enough buttons so I had an idea to double the size by getting some new acrylic fronts and backs made that were double the width and held two PCBs next to each other.
There are enough inputs left on the Arduino to connect the second set of buttons so no need for another Arduino.
I use Sketchup a lot and now I can attach several commands to the second set of buttons.
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