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

An edge device, comprising:

• a plastic housing comprising:
• a cap having a first threaded portion and a plurality of vents configured to allow air passage from the environment of the edge device into an environment-exposed compartment;
• an upper housing having a second threaded portion, a third threaded portion, and an upper surface containing a sensor opening;
• and
• a lower housing having a fourth threaded portion, wherein the first threaded portion of the cap is configured to mate with the second threaded portion of the upper housing, and the third threaded portion of the upper housing is configured to mate with the fourth threaded portion of the lower housing, such that when assembled the cap and the upper housing define the environment-exposed compartment, and the upper housing and the lower housing define a sealed compartment;
• an electrochemical gas sensor comprising a sensor cell and a sensor circuit board, wherein the electrochemical gas sensor is partially disposed within the sealed compartment and is fixed in a position abutting the upper surface of the upper housing such that the sensor cell protrudes into the sensor opening to form a surface of the environment-exposed compartment;
• one or more upper rubber o-rings circumferentially disposed around a portion of the electrochemical gas sensor that protrudes into the environment-exposed compartment to create 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, 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, such that the magnet is arranged to interact with the reed switch by the rotation of the first plastic ring, 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 the interface between the upper housing and the lower housing.