[andlier]

No sure how these guys (https://www.xethru.com/) are doing financially, but they sell development kits for respiration sensors etc.

[lathiat]

Been following these guys for a while. Fascinating product.

To me though the most obvious but sadly simple use for this is sensor lights in damn toilets. Sit on the toilet for more than a few minutes in some places and the damn lights go out!