“RejsaCAN is a 3x5 centimeter small ESP32 based board aimed at car use that I put together for my own use in my assorted crazy car projects. The board has an on board CAN interface and can be powered directly from the car (5-15V). It also includes the option to auto shutdown so not to drain the car battery.
There is no bespoke code for the board apart from pin definitions, it’s just a piece of universal hardware, but by using easy to use open source Arduino libraries it can be made to interface not only to various CAN buses, Network/Wifi and Bluetooth but to numerous sensors and other peripherals using the ESP32’s built in interfaces.
If you think the board really would fit your project you can give me a holler at magnust@gmail.com. I had JLCPCB make and assemble my own small batch of boards.”