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Wireless sensor devices for post-harvest crop quality and pest management

  • US 10,296,863 B2
  • Filed: 05/01/2018
  • Issued: 05/21/2019
  • Est. Priority Date: 05/02/2017
  • Status: Active Grant
First Claim
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1. An edge device, comprising:

  • a plastic housing encasing an environment-exposed compartment and a sealed compartment, the environment exposed compartment defined by a cap and an upper housing and the sealed compartment defined by the upper housing and a lower housing, the cap having a first threaded portion mated with a second threaded portion of the upper housing and a plurality of vents configured to allow air passage from an environment external to the edge device into the environment-exposed compartment, the upper housing having a third threaded portion mated with a fourth threaded portion of the lower housing and an upper surface containing a sensor opening;

    an electrochemical gas sensor comprising a sensor cell and a sensor circuit board, the electrochemical gas sensor is partially disposed within the sealed compartment and in a fixed position abutting the upper surface of the upper housing such that a portion of the sensor cell protrudes into the sensor opening and is exposed to an atmosphere within the environment-exposed compartment;

    one or more upper rubber o-rings circumferentially disposed around the portion of the electrochemical gas sensor that protrudes into the environment-exposed compartment creating a seal that abuts the sensor opening of the upper housing;

    a main circuit board disposed within the sealed compartment and communicatively coupled to the electrochemical gas sensor, the main circuit board having a plurality of mounted components respectively coupled to a battery, a reed switch configured as an on/off switch for the edge device, an antenna, and radio frequency (RF) circuitry;

    a magnet disposed on a first plastic ring, and a second plastic ring, wherein the first plastic ring is configured to rotate around the fourth threaded portion of the lower housing, disposed between the upper housing and the second plastic ring, rotationally translating the magnet with respect to the reed switch, and the second plastic ring is configured to mate with the fourth threaded portion of the lower housing; and

    one or more lower rubber o-rings disposed at an interface between the upper housing and the lower housing.

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