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Something like LD2410 [0]. IIRC there's newer ones that report accurate position and even heart beat rate, but I've forgotten the names of those..

[0] https://dronebotworkshop.com/ld2410c-human-sensor/

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Here’s one

https://thepihut.com/products/60ghz-mmwave-breathing-and-hea...

Same kind of tech but higher frequency.

> The MR60BHA2 is a 60GHz wave sensor that detects breathing and heartbeat patterns. Using its radar technology, it can monitor vital signs without direct contact, even through materials like clothing or bedding. You can use it for sleep monitoring, health assessments, and presence detection.

This is kind of crazy, I had no idea this was a thing. And here I have PIR sensors all over the place and hacks around those, that definitively sounds much better. Besides being more expensive and weaker range, any drawbacks for using it for motion sensing?

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