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> It's possible to detect a hand or any other conductive object
> at a distance of 6" by using capacitive sensing

Scott, the attached circuit will do just that. Sensitivity is mostly
dependant on the size of the metal plate. I've embedded these
behind walls as secret switches, using 100mm x 100mm of
adhesive aluminium foil as the sensor. A sensor that size will
react to a hand (parallel is best at that distance) through 100mm
of averagely-dry wood. Although I've described it as "touch" it's
actually a proximity detector. I often have a discrete Schmitt
trigger, with or without settable hysteresis points, after the op
amp to get logic levels but an analogue interface could be used


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