Opening this thread up to jump on the bandwagon. I too use Teensy(++2.0) controller boards for simpit building. But so far only as input devices (40ish buttons, 8 axis, digital encoders, hat switches, etc etc). I would like to be able to receive data from DCS in order to light up warning messages, run digital information disiplays, gauges, dials, and so on.
Unfortunately I am not a programmer, and that is what this project would require; someone who knows how to write a program that would accept the output from DCS and then translate it to the language that the Teensy would understand.
This has been successfully done in X-Planes through the efforts of a few skilled programmers who are also flight sim enthusiasts.
http://www.youtube.com/watch?v=FYYS-dVS2vg