this post was submitted on 06 Jan 2025
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homeassistant

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Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io

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I've been using HA for a while; having my home just "do things" for me without asking is fantastic. My lights turn on to exactly the levels I want when I enter a room, my grass and my plants get watered automatically, heating and cooling happens only when it needs to. There are lots of benefits. Plus, it's just a fun hobby.

One thing I didn't expect, though, is all the interesting things you can learn when you have sensors monitoring different aspects of you home or the environment.

  • I can always tell when someone is playing games or streaming video (provided they're transcoding the video) from one of my servers. There's a very significant spike in temperature in my server room, not to mention the increased power draw.
  • I have mmWave sensors in an out-building that randomly trigger at night, even though there's nobody there. Mice, maybe?
  • Outdoor temperatures always go up when it's raining. It's always felt this way, but now it's confirmed.
  • My electrical system always drops in voltage around 8AM. Power usage in my house remains constant, so maybe more demand on the grid when people are getting ready for work?
  • I have a few different animals that like to visit my property. They set off my motion sensors, and my cameras catch them on video. Sometimes I give them names.
  • A single person is enough to raise the temperature in an enclosed room. Spikes in temperature and humidity correspond with motion sensors being triggered.
  • Watering a lawn takes a lot more water than you might expect. I didn't realize just how much until I saw exactly how many gallons I was using. Fortunately, I irrigate with stored rain water, but it would make me think twice about wasting city water to maintain a lawn.
  • Traditional tank-style water heaters waste a lot of heat. My utility closet with my water heater is always several degrees hotter than the surrounding space.

What have you discovered as a result of your home automation? While the things I mentioned might not be particular useful, they're definitely interesting, at least to me.

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[–] Empricorn@feddit.nl 3 points 1 week ago (2 children)

Outdoor temperatures always go up when it's raining.

Are you saying the outside weather temperature rises when it starts to rain, or am I understanding that incorrectly?

[–] friend_of_satan@lemmy.world 4 points 1 week ago (1 children)

It's probably rain clouds trapping heat from escaping into the atmosphere, and humid air equalizing the temp by sucking heat off of high heat capacity surfaces like rocks and cement, warming the air.

That's just my guess though. I have no relevant scientific expertise.

[–] BlueEther@no.lastname.nz 4 points 1 week ago

Along a similar line, ground temp (~200mm deep) lags air temps by about 12 hours

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[–] Psythik@lemmy.world 3 points 1 week ago (4 children)

Wait, how do you make your smart bulbs turn off and on automatically when you enter/leave a room? I've been using them for years and I always have to manually trigger them with an app! And how are you measuring power usage?

[–] corroded@lemmy.world 1 points 1 week ago

I use a mmWave presence sensor and PIR motion sensor in each room. I've found that mmWave sensors tend to give false positives and motion sensors don't work too well when a person is at rest (say sitting and watching TV). Lights come on when the motion sensor triggers, then they shut off when the presence sensor has been idle for a set time, usually 5 minutes. This works perfectly for me.

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