Flat Soil Moisture Sensor with Anchoring Barbs
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Solution Overview
Problem
Conventional soil moisture sensors face issues with inaccurate readings due to soil disruption during installation, loss of contact as soil cycles, and cumbersome installation processes, leading to inefficient irrigation control.
Innovation Solution
A wireless soil moisture sensor with a flat body, two lower electrodes, and anchoring barbs for stable soil contact, paired with a receiver that compares moisture data to predetermined limits to interrupt irrigation schedules, providing visual and audio alerts for optimal turf conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional soil moisture sensors are installed by boring holes and placing sensors at depth, then the sensor can measure soil properties in the root zone, but the installation process disrupts soil strata and decreases measurement accuracy
Solution Approach 1:
The sensor is divided into multiple functional segments: a flat sensor body with measurement electrodes, separate anchoring barbs for securing, and a protective housing. This segmentation allows the sensor to be installed superficially while the anchoring barbs penetrate the soil to prevent displacement, avoiding the need to bore deep holes and disrupting soil strata less than conventional deep-bore installation methods
Solution Approach 2:
The sensor transitions from traditional point-contact electrodes to a flat planar body with surface electrodes. This dimensional change from point to plane allows the sensor to maintain stable contact with the soil surface and measure moisture in the root zone without requiring deep burial that would disrupt soil layers. The flat body distributes contact across a larger area, improving measurement accuracy while simplifying installation
2Measurement precision
If soil is restored to previous condition after sensor installation, then sensor readings correctly reflect soil state, but restoring soil properly is time-consuming and complex
Solution Approach 1:
The anchoring barbs are designed to self-penetrate into the soil and securely hold the sensor in place without requiring manual soil restoration. The barbs'尖锐 edges allow them to pierce the soil surface and anchor the sensor firmly, eliminating the need for time-consuming slurry filling and soil packing operations that are required in conventional installation methods
Solution Approach 2:
The anchoring barbs are pre-formed with penetrating edges and attachment mechanisms that enable immediate securing of the sensor upon insertion. This preliminary preparation of the anchoring structure allows the sensor to be firmly anchored in a single insertion action, eliminating the need for subsequent soil restoration steps that would otherwise be required to prevent sensor displacement
3Ease of operation
If manual suspension of irrigation cycles is used, then operator control is maintained, but the method is inconsistent and inefficient leading to resource waste
Solution Approach 1:
The sensor provides continuous feedback on soil moisture levels to the irrigation controller, enabling automatic adjustment of irrigation cycles based on actual soil conditions. This closed-loop feedback system replaces manual operator decisions with automated control that consistently responds to measured soil moisture, eliminating the inconsistency and inefficiency of manual suspension while preserving operator oversight capability
Solution Approach 2:
The manual mechanical operation of suspending irrigation cycles by operator action is replaced with an automated electronic control system. The sensor electronically communicates soil moisture data to the controller, which automatically adjusts irrigation timing and duration, substituting the mechanical/manual control process with an automated electromechanical system that provides consistent and reliable operation
4Extent of automation
If wires are routed from sensors to central controller, then control signals are transmitted, but the installation is burdensome and prone to unsuccessful installation
Solution Approach 1:
The complex wire routing and physical connection system is extracted and replaced with a wireless communication subsystem integrated into the sensor. The sensor contains a wireless transmitter that sends moisture data electronically to the controller without requiring physical wire connections through the soil, eliminating the burdensome wire installation process while maintaining automatic interruption capability
Solution Approach 2:
A wireless communication intermediary (transmitter/receiver system) is introduced between the sensor and controller to transmit control signals and moisture data. This wireless intermediary replaces the direct physical wire connection, eliminating the need for complex wire routing through soil and across surfaces, while enabling reliable automatic irrigation control through electronic communication
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures accurate and efficient irrigation control by maintaining stable sensor contact, reducing manual intervention, and simplifying installation, thereby preventing over-watering and under-watering while conserving resources.
Implementation Method 1
two lower anchoring barbs
Implementation Method 2
two lower electrodes
Data Source
AI summary
In one embodiment, the present invention is directed to a soil moisture sensor for interrupting an irrigation schedule of an irrigation controller. The moisture sensor comprises a relatively flat body with two lower electrodes and two lower anchoring barbs. A receiver receives moisture readings from the sensor and compares moisture data to a predetermined moisture interrupt value or limit, over which irrigation is interrupted.