I recently eliminated a combo heat, vent and light fan in my bathroom.
There were two switches before, one for vent and another for light+heat. To the new fan I have a 4 wires (load, neutral, ground, traveler). The traveler is currently capped off and I have it on a simple switch.
I would like to add a sonoff relay and maybe a humidity sensor as well. I have room in the switch box, or the ceiling for the sonoff. Is there any suggested setup for retrofitting this? Should I just leave the traveler wire capped? A schematic or diagram would be super helpful.