Thanks gilshultz,
A great bus indeed! I have looked around a bit and like this model https://www.seeedstudio.com/CANBed-Arduino-CAN-BUS-Development-Kit-Atmega32U4-with-MCP2515-and-MCP2551-p-4365.html
, as it combines the two things I'd like (the CAN controller and transceiver together with a ATmega32U4 chip), BUT - what I don't understand is
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how I would wire up say an LED to receive power from either (or both) of the units; certainly, you'd share GND, but would you share VCC? and further more, while one could conceive putting in a 3rd unit (to interface with leds, buttons, encoders, and send/receive info via CAN to/from the other two units), you'd still need to power said 3rd unit... again, shared GND and VCC, even if the power comes from different USB busses? Ideally, I am after
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no external PSU
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Power being taken only from the USB Bus power
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as long as USB... host? client? is connected, the system works and is powered on; but also works when both are powered.