A lot of data has flowed under the bridge since Bosch registered the controller area network (CAN) bus specification in 1986 and Mercedes-Benz first used it in its S-Class model in 1991. In the meantime, CAN has become an integral part of automotive development and design. The CAN bus is robust, making it useful for many other fields of application. A mobile CAN bus unit is useful to analyze communications, diagnose problems and control. The PiCAN HAT reviewed here will do the job, and it plugs into the latest version of the Raspberry Pi. Let’s take a closer look.