Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site biomed.UUCP Path: utzoo!watmath!clyde!bonnie!akgua!whuxlm!harpo!decvax!genrad!panda!talcott!wjh12!biomed!lagasse 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