I decided to take a few pictures of my OpenStim build. The plans call for a 17ohm resistor, but I had none in my parts bin, so had to improvise. The breadboard (and even the full blown Arduino) was meant to be temporary until I could make the whole thing pretty on a perfboard, though I've yet to get around to such.
Perhaps I'll order parts and build a unit that better meets the standard set by the OpenStim project.