Custard pi system custard pi custard pi3 the custard pi 3 is an 8 input analogue board for raspberry pi that is compatible with the a a b b and pi 2 versions the on board 8 x 12 bit adc chip connects to the pi via spi and sample code can be downloaded from the internet it features a stackable connector that allows access to the gpio signals while the board is plugged into the pi the pi is protected against the accidental connection of a high voltage custard pi 3 8 analogue inputs wit