In a message dated 2/27/01 11:10:08 AM Eastern Standard Time, Seth889@STARTREKMAIL.COM writes: > Hi, I'm wondering.. I heard in a publicity of an alarm company that they > have an infrared detecter which can make the difference between pet and > human (how, I don't know ... ok it don't really "make" the difference, but > the IR won't react to a cat for exemple, but will react to a human) I found > this very cool, especially if you have pet at your house... > > I'd like to build something like that ... Do any of you guys know what is > the trick ? Is it less sensitive ? Does it require a minimum of movement > ... > > Simon, I use these detectors in my shop. They produce a multi path beam. Multiple beams must be broken in both directions to set them off. We had a problem with rodents getting into the shop. (We are in the country so field mice and rats are common) They kept setting off the old detectors. Even the mouse traps would set the darn things off. The new ones are very sensative to humans but cats and mice seem not to bother it at all! Ray Russell General Contractor Norfolk & Western Railroad Pocahontas Division Circa 1958 Visit The Pocahontas Website at: Click here: Pocahontas Home OR http://milliron.home.sprynet.com/Pocahontas/Pocahontas1.htm -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics