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Capacitive sensing for washroom fixture

  • US 8,381,329 B2
  • Filed: 10/23/2007
  • Issued: 02/26/2013
  • Est. Priority Date: 10/24/2006
  • Status: Active Grant
First Claim
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1. A hand washing lavatory system comprising:

  • a receptacle defining a hand washing area;

    a fixture configured to deliver water to the hand washing area;

    a first sense electrode coupled to the receptacle and configured to measure a first capacitive value;

    a second sense electrode coupled to the receptacle spaced apart from the first sense electrode and configured to measure a second capacitive value; and

    a circuit configured to control operation of the fixture in response to a change in the first capacitive value relative to the second capacitive value, wherein the circuit is configured to eliminate the effects of water flowing from the fixture in controlling the operation of the fixture;

    wherein the first sense electrode is U-shaped and the second sense electrode is located at least partially within the U-shape.

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