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A comment on The smart home is flailing as a concept. Parent comment

Re:The smart home is flailing as a concept by mynameisash on Friday August 06, 2021 @02:07PM (#28090856)
> (these detect movement by the disturbance in a low level high frequency radio signal).

I'd never heard of this before. One of my former managers is really into Home Assistant and has done a lot with his setup, but I think all of his motion detection was IR. How's your 'radar' setup? Do you get a lot of false positives/negatives? How's the distance on its detection?

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Re:The smart home is flailing as a concept by throwaway0a5e on Friday August 06, 2021 @04:48PM (#28092575)
He's talking about the motion detector things that are a drop in replacement for switches. You see them often in rooms in commercial buildings.

Something like this https://i.ebayimg.com/images/g/nvAAAOSwEK5fmkrH/s-l1600.jpg

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Re:The smart home is flailing as a concept by kwhitefoot on Saturday August 07, 2021 @04:11AM (#28096806)
> He's talking about the motion detector things that are a drop in replacement for switches.

No I'm not, but those work too.

This is what I bought: https://www.ebay.com/itm/153285261299

It is described as a radar sensor because it uses a high frequency oscillator and monitors the change in the signal due to things moving in the electromagnetic field. Imagine the effect of waving your hand near the aerial of a radio receiver when the signal is weak.

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