smôl Power Board AAA Hookup Guide
If your smôl stack is not communicating, it is probably in deep sleep. When the Power Board is commanded into deep sleep by the Processor Board, the only way it will wake it up again is when the sleep interval expires. You cannot wake or reset the system via the USB interface.
Removing and re-inserting the battery connection will reset the power board and wake it up again.
We did not include a reset button on the smôl Power Board to keep the board as small as possible. However, you can reset it via the ISP programming test points on the bottom of the board. Briefly connect RESET to GND to reset the board.