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Motion sensor with ultrasonic modulation

  • US 20120130511A1
  • Filed: 11/23/2010
  • Published: 05/24/2012
  • Est. Priority Date: 11/23/2010
  • Status: Active Grant
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5. A motion sensor comprising:

  • a) a motion sensor unit for controlling a load in response to detected motion, the motion sensor unit comprising;

    I) an ultrasonic sensor for detecting a first level of motion;

    ii) a PIR sensor for detecting a second level of motion, wherein the motion sensor unit is configured to close a load circuit when the first level of motion and the second level of motion are above a threshold value; and

    b) means for turning off the ultrasonic sensor when ultrasonic radiation emitted from a source other than the ultrasonic sensor is detected.

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