This project requires Raspberry Pi B+, Raspberry Pi camera, a pushbutton switch, a relay and some miscellaneous components. Fig. 1: Circuit diagram of the face-recognition system using Raspberry Pi ...

and we now have more details about the Raspberry Pi RP1 including a (draft) datasheet and a block diagram. The RP2040 came out before the RP1 peripheral controller as the design for the latter started ...