This burglar alarm system circuit is using a infrared proximity detector that triggers an alarm when the rays falling on its sensor are interrupted. It is different from others burglar alarm systems ...
This door alarm is based on the interruption of Laser beam. A low cost Laser pointer is used as the source of light beam. When somebody breaks the laser path, the alarm will be generated for few ...
ALEXANDRIA, Va., Dec. 1 -- Joseph Reghetti of Las Vegas, and Barry Kenneth Anspach of Centennial, Colo., have developed methods and apparatus for generating a data structure indicative of an alarm ...
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