This is Arduino source-code for a device that plugs into the OBD port on certain models of Caterham Seven, talks to the MBE ECU, and displays a few pages of diagnostics on its little screen. It should (hopefully) be useful for debugging sensor problems and for maintenance jobs like resetting the throttle position sensor.
The hardware is a CANBed RP2040 development board, coupled to a 128x128 pixel OLED display. This board is nice because it's super-cheap, compact, has a relatively powerful microcontroller, and has all the electronics needed to interface with the ECU on a single board.