Magnetic Alarm System
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United States of America Patent
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May 12, 2016
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May 12, 2016
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Abstract
A security system comprises a Hall sensor, two comparators, and a logic unit. The system takes periodic measurement of the magnetic field in the vicinity of the Hall sensor and compares the measured voltage to two known references voltages. When the measured voltage is outside the range defined by the reference voltages, the system triggers an alarm.
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