people detector, cheap, low consume, and easy to build, is that too much?
Mark Willis email (remove spam text)
Do check a 555 - I built one of those years ago while in high school &
was rather impressed with the range you could get (3-4 foot very easily
off a doorknob.) Put a foil tape piece on the window and turn the
sensitivity up some, and you're set. (Except for battery life!? THAT
may be a problem, frankly. Use a CMOS 555?)
Probably a better answer: http://www.qprox.com/ has various proximity
sensors, you can take a look at those; Some pretty fair prices IMO.
Self-calibrating, can act as a reed relay replacement when configured
properly. Look at the QT110, 30uA or so at 5V. $2.47 in 1k quantities,
probably $5 in singles? Just drop it in series with the ISD14000. That
price is a lot more like it...
Mauricio Jancic wrote:
I re-ship for small US & overseas businesses, world-wide.
(For private individuals at cost; ask.)
See also: www.piclist.com/techref/index.htm?key=people+detector
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