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Non-contact selection and control of lighting devices

  • US 8,243,278 B2
  • Filed: 05/15/2009
  • Issued: 08/14/2012
  • Est. Priority Date: 05/16/2008
  • Status: Expired due to Fees
First Claim
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1. A method for detecting a presence of an object, the method comprising:

  • emitting, from a light emitting device (LED) of an apparatus, an electromagnetic signal, the electromagnetic signal comprising high components and low components;

    determining, by a detector of the apparatus, that an average intensity of a received portion of the electromagnetic signal is below a predetermined threshold, the average intensity determined responsive to a ratio of the high components duration over a period of time to the low components duration over the period of time; and

    detecting, by the detector, a presence of an object, located in a first proximity of the detector and reflecting a portion of the electromagnetic signal, by determining that a sum of average intensities of the received portion of the electromagnetic signal and the reflected portion of the electromagnetic signal exceeds the predetermined threshold, the sum of average intensities determined responsive to the ratio.

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