this post was submitted on 14 Apr 2026
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I need to get my 3D printer working so I can actually print a housing for my smart thermostat.
All you really need is a temperature sensor and a 4x relay board.
Ya the basic thing isn't that difficult. I am adding other air quality sensors and I want to be able to control air exchange, humidifier, and exterior vents (bathroom fan). And I want it to be a bit more advanced/energy efficient vs a dumb pid loop. Also, it should operate if home assistant goes down.
I have an automation for controlling bathroom vent fans using a humidity sensor in the bathroom and a reference one outside it if you're interested.
It also has logic to not turn off the fan if it has a Bluetooth speaker that's playing music (currently using the "Music Active" companion app sensor, Bluetooth MAC was flakey).
And logic to turn it off if the AC is running and music isn't playing.
I appreciate it! I have one setup already, mine decides whether to circulate the air in the house or vent the bathroom fan depending on the humidity in the rest of the house too.
I like the idea/practice of "edge devices" where each device has its own responsibilities and autonomy to some extent, with home assistant acting as an overseer. if HA goes down, most of my house still works fine/has fallbacks. Need that wife approval factor lol. one time she couldn't turn off the lights while I was out of town, lol she was a little pissed
Yeah, getting my wife on board has been the hardest part of things.
Yep, fallbacks are important