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System and method for energy efficient measurement of sensor signal

  • US 9,946,410 B2
  • Filed: 03/11/2014
  • Issued: 04/17/2018
  • Est. Priority Date: 03/15/2013
  • Status: Expired due to Fees
First Claim
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1. A method for improving robustness of a capacitive sensor system, said method comprising the steps of:

  • a) operating the capacitive sensor system wherein received discrete sensor signals are filtered by a band-pass filter having a band-pass having a first center frequency;

    b) polling subsequent discrete sensor data at a first polling rate using the sensor system, wherein a sensor state is determined to be off when a received sensor signal is below a predetermined threshold and the sensor state is determined to be on when the received sensor signal is above the predetermined threshold;

    c) determining whether a polled discrete sensor value with respect to a previous discrete sensor value is transitioning from a first state to a second state or from a second state to a first state;

    d) upon determining a transition;

    d1) polling subsequent discrete sensor data at a second polling rate being higher than the first polling rate using the sensor system for a predetermined time period;

    d2) verifying during the predetermined time period that the subsequent discrete sensor data polled at the second polling rate are consistent;

    d3) upon verifying that the subsequent discrete sensor data polled at the second polling rate are inconsistent, repeating at least step d2) wherein said band-pass filter is controlled to have a second center frequency and when it is determined that the subsequent discrete sensor data polled at the second polling rate are consistent continuing with step b).

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