I recently purchased a Xiaomi Air Purifier 2, to avoid having dirty air in my apartment. Unfortunately, this product does not integrate with HomeKit. I am generally averse to having my “connected” home accessible from the internet, but I did want to use the HomeKit automation features. Setting this whole thing up just for one air purifier did seem like a lot of hassle, until I found out (from Steven Troughton-Smith) that you can get a Raspberry Pi Zero W with a camera module, which also works under HomeKit. Two-in-one? No need to ask me twice.