this post was submitted on 20 Sep 2024
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Greentext

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[–] WalrusDragonOnABike@lemmy.today 1 points 1 month ago

Many just detect temperature changes. And upside down can will spray cold air. If there's any space between the doors or between the door and the frame, you can spray it in and it'll detect the temperature motion. Fancier models do exist that are more specific, so YMMV.