The Arduino-Python3 Command API is a lightweight Python library for communicating with Arduino microcontroller boards from a connected computer using standard serial IO, either over a physical wire or ...

The repository for an arduino library that helps handling commands from the serial interface. - msnicklous/CommandCatcher ...

The “N” in CAN stands for network, after all. The trick is to create a device ID for each desired CANSerial interface, which is done in his library using the usual Arduino setup step.

Use Arduino to handle sensor input and relay control. Pi runs a Python Flask server with a simple UI to toggle GPIO pins via serial commands sent to the Arduino.