Design also like Polar loop, LG smart activity tracker ... Because I have led obsession :-)
Yesterday I received boards from OSH PARK.
Thanks very much for ulra fast shipping, there is result.
just one small bug MMA8452Q is rated on max supply voltage 3.6V
but watch are powered with lion battery full charged on 4.2V
all working now, firmware is very simple now, just display time, temperature and voltage. Display is activated with hand rise (no touch, no shaking).
Screen filter, just thin board with 110 holes
1.73x0.78 inch (43.82x19.74 mm) 2 layer board.