First off, here’s a link to the original thread on this topic, from which most of this tutorial is derived. Many thanks go to @Altitude, who first conceived of this solution and figured out the wiring details. There’s nothing wrong with the old thread, and there’s a lot of good information there, but I thought it would be good to get a fresh thread going with a clearly laid out tutorial. The old thread, while useful, has a lot of obsolete and occasionally conflicting information, is o