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Need help for body presence sensing circuitry design

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GT-Janos

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I need an inexpensive solution to detecting human presence (not motion) detection at a max. 5m (16ft) distance from the sensor preferably non-temperature based.

If the distance between the body and the sensor could also be approximated, it would be a bonus!

Am I expecting too much?

GT-Janos
 
preferably non-temperature based.
Why? Are you looking for corpses? If not, I think an IR sensor would be the best bet (but I don't see how that alone could indicate distance).
 
Something using the same principle as a theramin? May be able to give you some idea of distance too.
 
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Hi Alec_t,

The gadget would turn on-off a heater and I thought that there could be some interference, but probably wouldn't.
I keep the corpses in the closet (without heating).

I'm new to the community, so how does it work work with your "experimental" circuitry? Cheers
 
There was an article I read a number of years ago about a "radar" made with off-the-shelf parts "for about $15" that could detect a person's breathing. It was developed by a scientist at Livermore Labs. If you Google it you'll probably find it.

I'll bet you have the same idea I did when I read the article :D That application was patented by another party unconnected to the Livermore guy.
 
Hi mdredmond,

I tried to google the article, but couldn't find the item you recommended. Maybe my search criteria:
"radar" made with off-the-shelf parts "for about $15" was not the best.

Regards,

GT-Janos
 
Try "human detection radar."

This may be close, but I am not IEEE and can't access: **broken link removed**

John
 
Well that article describes the basic function, but since it operates at 2.4GHz and doesn´t show much more than theory, I don´t think it is much use for a normal hobbyist.
Anyway I may be able upload a screenshot somewhere if somebody wants it.
 
I'm new to the community, so how does it work work with your "experimental" circuitry?
I design circuits, then simulate their operation with the aid of LTSpice. Theoretically they work, but simulation can never be 100% accurate. I usually don't build them for real.....I leave that for others to do :).
 
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