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From: lagasse@biomed.UUCP (Robert C. Lagasse)
Newsgroups: net.analog
Subject: PIR (passive infrared)detectors
Message-ID: <81@biomed.UUCP>
Date: Mon, 24-Jun-85 18:21:34 EDT
Article-I.D.: biomed.81
Posted: Mon Jun 24 18:21:34 1985
Date-Received: Wed, 26-Jun-85 06:22:24 EDT
Organization: Mass. Gen. Hosp. - Dept. Biomed. Engineering
Lines: 12


           I was interested in buying a PIR detector to mount on the side of
my house to detect anyone around the cars in the yard and activate a relay
to turn on some floodlights for a minute or so.  Has anyone used these
commercially available detectors?  How does the detector ignore the hot
asphalt pavement on a summer evening?  What about a kitty walking by?  What
kind of beam shape do they have?  Can it see a person through the car
windows? (I would think not).  Any comments are appreciated. Is this the
right newsgroup for this?  THANKS


Bobby L @ MGH