ruffrecords said:
gemini86 said:
This sort of thing is done all the time in industrial and automotive systems. It's called a can bus and shouldn't be that hard to implement.
Interesting. I have one some on line searching but I cannot find anything that says CAN bus is carried on the dc power lines. Can you point me in the right direction?
Cheers
Ian
+1 there is a DC-BUS
https://en.wikipedia.org/wiki/DC-BUS
CAN bus is built into some micro's I use (i never used CAN). Looks like it takes 2 wires by itself.
Thinking out loud... If you designed your own communication protocol that was always sitting positive 12V at rest, with momentary negative (0V) pulses to frame and transmit data. A diode and capacitor after the logic receiver could insure continuous power to your circuit.
A little odd, and perhaps not very fast, not to mention a huge noise source, but you could pass power and data over single wire and ground pair.
Sounds like more work effort than it is worth.
JR