plush karma
I want to augment my homes light switches with relays and current sensors for remote control. Currently I have Cat5 UTP going to the switch boxes.
I don't want to use a normal smart switch setup, with only the relay being in control of the light. [I want to use the existing mechanical switches and just augment them with relays so they appears to be unchanged and match the non smart switches. I also want it to continue to work as a normal switch when the relay inevitably fails (closed).]
I intend to use Bi-Stable relays and an inductive current sensor.
I want it to be as low power as possible and have as little in the wall box as possible. The wall boxes are space limited and I don't want to accesses each individual wall box to do upgrades and or maintenance.
Q: What is the lowest component count system (on the remote end of the wire [red box]) to control relays and get ADC readings back to Home Assistant over a wire (cat5 utp) ?
I would ideally just like each relay to be switched via the wires in the UTP then have a multi channel ADC send current data via the 4 other wires.
But I can't find a standalone ADC that send via a differential / long distance physical data layer. So it appears I will have to have an MCU in each wall box with some firmware on it.
vernal bane