Sorry about the delay getting back on this. I thought I had set this thread to notify me when it got a post, but I didn't.
I just realized that the source isn't available in one place. Most of the code in the book was posted along with the Nuts&Volts Smiley's Workshop article series and I intended to put it all in one place, but haven't done so to date. Since the code uses the Arduino libraries, it tends to be fairly short and easy to input, so I don't think its abscense should be a problem, but I'll make a TODO to get it all together in one place ASAP.
Thanks for the interest,
Smiley 