This board has been inspired by Leonerd it's an open source and open hardware. On the hardware side is fully compatible (not tested with 5V input tolerant boards) On software side there are some new features usefull for SMuFF device

PLEASE NOTE REV1 HAS PCB ERRORS. TO PROPERLY WORK NEED SOME PCB, PINS, PADS AND ROUTES CUTTING. THESE SHOULD BE FIXED IN REV2 BRANCH