Adafruit featherwing add ons for all feather boards adafruit 2884 the adafruit featherwing proto prototyping boards gives you a place to mount your custom circuitry once your breadboard prototype is working all the feather signals are brought to pads theres a row of 33v pads another of gnd pads and a 90 x pad area for general usesupplied as a bare pcb plus strips of 01in header pins for you to solder on as required adafruit 2884 featherwing proto prototyping add on for all feather