Random thought of the day...
I've often wanted to figure out a way to automatically turn on my laundry room vent fan when the cats use the litter box (it is in the laundry room, obviously).
Don't really want to mess with finely tuned motion sensors, or pressure sensors under the boxes.
So I picked up an air quality sensor (measures PM1, 2.5, 10), hooked it to an ESP8266, pumped the data to MQTT/Grafana and am going to trend it for a while and see if I can see correlation.
Might not work. Probably won't work. But it gave me something to do for a few minutes.
(side note - I can definitely detect when the dryer is running with it... lol... Litter box is TBD...)