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Cedric Chang wrote:
> What would be lowest cost method of detecting
> a hand moving through a volume of space.
> Imagine a media center and you wave your hand
> in front of it to turn on illumination for all the buttons
> and knobs.  Interrupting a beam won't work since
> I don't want anything to extend beyond the amplifiers,
> cable box and stuff.  Room may be in nearly complete
> darkness.  Hand waving must occur within 6 inches of
> target.
> 
> 
> Cedric
> 

Sounds like a Theramin to me. Have a look at some of the old Theramin
circuits, they're sensitive to several inches.

- --
Brendan Gillatt | GPG Key: 0xBF6A0D94
brendan {a} brendangillatt (dot) co (dot) uk
http://www.brendangillatt.co.uk
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