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Soil moisture sensor

  • US 9,804,113 B2
  • Filed: 05/18/2015
  • Issued: 10/31/2017
  • Est. Priority Date: 05/19/2014
  • Status: Active Grant
First Claim
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1. A soil moisture sensor, comprising:

  • a capacitive probe configured to be inserted into soil;

    a series RLC circuit electrically coupled to the capacitive probe; and

    a microcontroller configured toprovide a drive signal having a predetermined drive signal frequency to the series RLC circuit,receive an output signal including one of an output voltage or an output current from the capacitive probe,determine the capacitance value of the soil based at least in part on the received output signal, anddetermine the moisture content of the soil based on the determined capacitance value.

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