Exploiting the fact that Mobius accepts keyboard input, I decided to build a pedal board using a busted USB keyboard and some miscellaneous hardware.
This is far from a new idea, lots of folks have done it; here are a few 'ibles using similar principles, dealing with pedals and keyboards and whatnot:http://www.instructables.com/id/cheap-and-simple-foot-pedal-keyboard/http://www.instructables.com/id/USB-foot-pedal-keyboard/http://www.instructables.com/id/Hack-a-USB-Computer-Keyboard-to-Make-a-Synth-Pedal/http://www.instructables.com/id/Add-foot-pedals-or-ergonomic-buttons-to-your-compu/http://www.instructables.com/id/One-Key-Keyboard-Hack/
Basically you are taking a keyboard and replacing a few of its little buttons with bigger buttons.
Similar pedals have been made to trigger MIDI events, scroll through sheet music, and enable users to do any number of other swell things with their lower appendages. This design could be easily adapted to any of those uses. Have a laser cutter or CNC router? Then your pedals will look way cooler than mine!
-thick plywood (I used 3/4" but thinner would be fine).
-thin plywood, les than 1/4" (I repurposed a sliding panel from a defunct cabinet)
-other wood scraps
-PVC pipe, cut in half lengthwise
-momentary pushbutton switches
-logic board and USB cable from a USB keyboard (these usually die of mechanical problems, so the parts we need here are fine)
-insulated copper wire
-springy electrical contact thingamabobs, salvaged from an old learning-about-electronics kit (optional: you could just as easily solder all your connections together. I used these because at first I wanted to make a fully reconfigurable board. Gave up on that idea, but the springy things remained).
-saws: circular, jig
-hot glue gun
-wire cutters, strippers
-paint & brushes
-volt meter (continuity tester)
Note: I will be providing no real measurements, because I didn't do much measuring: it was all eyeballing and trial and using one thing as a template to trace the next thing so that both things are the same size.