[sdiy] Proximity detector

[Tim Escobedo]

--- Fredrik Carlqvist <ifrc at iar.se> wrote:
> 
> Hi!
> 
> Does anybody know a circuit for detecting the presence of a
> human body? Kind of like the ones that open the doors at the
> supermarket. Preferrably, they would output a voltage
> proportional to the distance of the body.
> 
> 
> Fredrik Carlqvist

Someone recently posted some info about the QT301 chip. 

Also, there are a couple IR modules popular with robotics folks that
are configured as proximity detectors. 

Also try a search on the Theremin.

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