ATOM HUB PROTO is a DIY expansion board kit designed specifically for the ATOM series. It allows users to build hardware circuits or connect external devices according to their specific needs and requirements. With the aim of providing versatile connectivity options, ATOM HUB PROTO offers a range of interfaces, including the VH3.96 interface, DC5V power interface, and GROVE interface. Additionally, the board features various pre-cut openings on the casing for convenient wiring. The back of the board is designed with multiple mounting holes, supporting traditional hanging holes, screw fixation holes, and compatibility with slide rail fixtures.