SVOBoy, I wish I had found that article first. Yeah, that's exactly the kind of introduction to
MPGuino that a newbie needs.
Wyatt, thanks for the link. I'm a mechanical engineer, not electrical, so I'm a little bit out of my element here. I don't understand how the circuit works or what each of its parts do. But if you think your parts list is a good one, I'll order the parts tomorrow.