The microcontroller mustn’t get +/- 12v on its RX pin or reset pin. Using a simple one transistor driver, opto-coupler or MAX232 can do it. Some people claim to have used an 7805 in series, even.

These demos showed the breadth of projects where BITalino could be useful. The board isn't just for education and enthusiasts, though, as it could have a more serious effect in areas like health care.