Home Assistant is open source home automation that puts local control and privacy first.
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Home Assistant can be self-installed on ProxMox, Raspberry Pi, or even purchased pre-installed: Home Assistant: Installation
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We've been having trouble with ~~rodents (I assume squirrels)~~ in the crawl spaces on our second floor. I decided to stick a PIR sensor on the door to see if I could catch any movement, and sure enough, a bunch of movement around 1 AM this morning. (Correction, it was a possum, which makes sense in hindsight as they're nocturnal).
As long as the sensor only picks up stuff that's rat-size or larger then it's fine. If there are something "large" down there, it can be a hazard to the house foundation. I'd say it's better to know. ๐