OMG just saw @stevempotter 's pendant and that is amazing! Nice work!
I’m definitely going to be taking ideas from that. Sounds like ESP-NOW mitigates some of the downsides of bluetooth/wifi but I’m still sticking with wires for this version.
I’m starting to question if the Arduino Pro Micro is the best choice, and if I should go for a longer serial link (maybe RS485) so that the microcontroller goes into the pendant instead of staying in the expansion slot with a large number of wires for all the pendant knobs and switches.
Lots to think about.