I've updated the library.
I've gotten a lot of emails about how to get the radar to work with Arduino. So I've updated the library to make it better and easier to use.
Basically the functions for receiving data from the radar has been updated to eliminate a lot of error messages (-99) that came before.
It only works for the respiration app right now, but it should be easy to implement sleep and presence if anyone wants to contribute. Or I'll do it in the future.