Re: ot> driveway alarm/notification systems - Saab General Bulletin Board - Saabnet.com
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Re: ot> driveway alarm/notification systems
Posted by BobS (more from BobS) on Sat, 5 Jun 2010 14:47:27
In Reply to: ot> driveway alarm/notification systems, kooch, Sat, 5 Jun 2010 07:55:46
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When we built our new home, I looked into and installed a driveway alarm. The main issue with optical - IR types is we have deer and other critters that cross the driveway about every night. A long time in the woods type home owner recommended a magnetic sensor that only responds to changes induced in the earth's magnetic field by metallic objects. Anything from steel toed shoes right over the sensor to lightening set it off. The nephew likes to ride his motorcycle in the grass around the sensor to surprise us, otherwise it works well except for lightening in the middle of the night. I installed a switch to turn it off when thunder storms are predicted. We have a Meir Products Co. system, with a sensor in a PVC pipe under the poured concrete drive.
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