Bare conductive pi cap for raspberry pi a b 2 and 3 bare conductive pi cap the b pi cap b is an add on board that adds precise capacitive touch distance sensing and high quality audio functions and is designed for use with the b raspberry pi b a b 2 and 3 and any raspberry pi with a 40 pin gpio connector br br using the pi cap it is very quick and simple to connect a raspberry pi to the physical world the board has 12 capacitive sensing electrodes that can have anythi