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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