I relented and we got a cat. He’s a good little guy, but he does create some ungodly smells. Unfortunately the best place for his litterbox is in an alcove in our lounge. Even with a window open (not possible in all weather) some smells do waft over.
This presented an excellent opportunity to over-engineer a solution using some electronics, 3D printing, and indoor hydroponics apparatus!
This is the result:
