this post was submitted on 06 Jan 2025
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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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[–] Fedop@slrpnk.net 6 points 4 days ago (2 children)

I never thought about temperature/humidity sensors! I know some gardeners that use them in various greenhouses, but that's interesting stuff. Is there anything yall've learned about the power efficiency of heating/cooling methods? Currently we're making a lot of baked goods and stews to keep the house warmer and more humid, but I don't have any data on actual power use changes.

[–] Preflight_Tomato@lemm.ee 1 points 3 days ago

Check out Technology Connections on YouTube. Specifically this playlist on heat pumps.

The only thing more efficient would be mechanized Solar shades and passive techniques.

[–] GreatAlbatross@feddit.uk 4 points 4 days ago

I've had a temp/humidity temperature in all house rooms for a few years now, and it's dead useful.

Balancing the radiators and TRVs so everything heats up evenly.

Spotting anomalies (top floor loses a lot more heat when the wind is blowing)

And setting the flow temperatures for the radiators, as I can see the rate of heating compared to outside temperatures.

[–] Psythik@lemmy.world 3 points 4 days ago (3 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?

[–] F04118F@feddit.nl 10 points 4 days ago* (last edited 4 days ago)
  1. Motion sensors. The mmWave are very sensitive but also expensive. Nice for rooms where you sit still or lie down for longer periods, such as an office or bed room. PIR sensors are the cheap ones, very useful for hallways, stairs, kitchen and toilets.
  2. Some smart plugs measure current. Innr has a nice zigbee smart plug with a physical button and monitoring for around €20.

FYI If you have a Zigbee bridge, you can just connect most zigbee devices to it and you are not tied to the app or devices of the bridge's brand.

[–] colebrodine@midwest.social 5 points 4 days ago (1 children)

You'll want to research "room presence" systems.

Here's one I've been looking at implementing for an example: https://espresense.com/

[–] ShepherdPie@midwest.social 3 points 3 days ago

If you go this route, you'll absolutely need mmWave sensors as regular PIR sensors only sense movement not presence and you'll experience lights shutting off when you're sitting too still in a room. I've considered setting this up a few times but want mmWave and PIR sensors with a lux sensor all-in-one and the market for this is extremely small. I think only some sketchy Tuya and the Everything Smart Home youtube channel have sensors like this but they're expensive and I just haven't pulled the trigger.

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[–] Empricorn@feddit.nl 2 points 4 days 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?

[–] modeler@lemmy.world 7 points 4 days ago

Depending on the location, but

  1. Often rain comes along for the ride on a warm front as it moves over the property (although cold fronts also carry rain)
  2. In winter, the rainclouds act as insulation and so rainy days are warmer than blue-sky days
[–] friend_of_satan@lemmy.world 4 points 4 days 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 4 days ago

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

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