Adafruit perma proto hat for raspberry pi a b or 2 adafruit 2310 the b adafruit perma proto hat b is a plug in daughterboard that is compatible with the raspberry pi a b and pi 2 the board has a grid of 0 1 prototyping solder holes for attaching chips resistors leds potentiometers etc to create a versatile and easy to use prototyping area the holes are connected underneath with traces to mimic solderless breadboards and there are long power strips for 3v 5v and earth conne