Method and apparatus for self-powered vehicular sensor node using magnetic sensor and radio transceiver
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United States of America Patent
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Jun 17, 2008
Issued Date -
N/A
app pub date -
Feb 19, 2005
filing date -
Mar 1, 2004
priority date (Note) -
Expired
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Abstract
Vehicular sensor node, circuit apparatus and their operations are provided. Power from a power source is controlled for delivery to radio transceiver and magnetic sensor, based upon a task trigger and task identifier. The radio transceiver and the magnetic sensor are operated based upon the task identifier, when the task trigger is active. The power source, radio transceiver, magnetic sensor, and circuit apparatus are enclosed in vehicular sensor node, placed upon pavement and operating for at least five years without replacing the power source components. Magnetic sensor preferably uses the magnetic resistive effect to create magnetic sensor state. Radio transceiver preferably implements version of a wireless communications protocol. The circuit apparatus may further include light emitting structure to visibly communicate during installation and/or testing, and second light emitting structure used to visibly communicate with vehicle operators. Making filled shell and vehicular sensor node from circuit apparatus.
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