I have an extensive layout control system built around an Arduino. The Arduino reads track sensors, controls track signals, and sends TMCC and DCS commands to trains and accessories for automated operation.
It's easy to have an Arduino read TMCC commands from a serial data wire, so you could definitely build a complex accessory that gets TMCC commands over a wire.
Receiving wireless commands would need a radio circuit of course... could you get serial data out of an R2LC or a Mini Commander?
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