Above is my latest Protothrottle Receiver. There are some features I would like to add but for the most part, it is code complete. I have more info on it here: Protothrottle Receiver
This is an Airwire Receiver (or transmitter if you wish) that interfaces to the popular Airwire System of Model Train Controls. I picked an Ardunio with this one as it is probably more familiar to the many computer hobbyists out there than a naked Atmega328. I wanted to keep this one accessible and as open source as I can. The Github Repository is available here: Github AirMini
More info on it is here: Airwire Mini