What you're looking for are home automation communities, such as:
- https://lemmy.ml/c/homeautomation
- https://lemmy.ml/c/homeassistant
- https://lemmy.world/c/homeautomation
Regardless of which instance you specifically join, you can subscribe to all three of these communities to follow & participate in their discussions. Here's an instance browser to help you decide where you want to make your account: https://lemmyverse.net/
It generally doesn't matter which instance you sign up on, but here's a few guidelines if you just want maximum access with minimum hassle. This information isn't really particularly necessary, but it may help alleviate the choice paralysis if you happen to be anything like me:
- Don't sign up for Hexbear -- it's a non-federated instance, so accounts there can't browse outside content.
- Try to avoid joining the largest instances (5k+ users) -- large instances are more likely to be blocked by others for various reasons (e.g.: lemmy.world & sh.itjust.works are blocked by beehaw.org)
- Try to avoid joining instances which specifically advertise themselves as catering to contentious or risque content (e.g.: lemmynsfw.com, burggit.moe, lemmygrad.ml) -- pretty self-explanatory why admins tend to like blocking these, I think!
- Try to avoid joining small (<1k users) and/or joke instances -- if your home-instance goes down, your account & comments will disappear with it, so choose something that looks like it has some staying power. This will also help streamline your onboarding experience because bigger instances are generally more strongly connected to everything else in the threadiverse.
- Still stumped? I can happily recommend my home-instance: https://lemmy.sdf.org -- not too big, not too small, highly innocuous content, and a long history of hosting robust fediverse servers.