Hygroscopic Rain Sensor Interface for Irrigation Threshold Control
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Solution Overview
Problem
Existing irrigation control systems lack the ability to dynamically adjust watering schedules based on real-time rainfall data and temperature, often resulting in inefficient water usage and difficulty in setting and adjusting rainfall thresholds, especially in environments where manual adjustments are challenging.
Innovation Solution
A system that includes a rain sensor with hygroscopic material to detect rainfall and a separate interface unit that communicates with an irrigation controller, allowing for dynamic adjustment of watering schedules based on sensed rainfall accumulation and temperature, with user-settable thresholds and pictorial displays for user input and feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rain sensor with hygroscopic material is used to detect rainfall accumulation, then measurement precision of rainfall is improved, but device complexity increases due to separate interface unit and communication requirements
Solution Approach 1:
The system is divided into separate functional modules: a rain sensor unit with hygroscopic material for rainfall detection, and a separate interface unit for processing signals and communicating with the irrigation controller. This segmentation allows each component to be optimized independently while maintaining overall system functionality.
Solution Approach 2:
The interface unit acts as an intermediary between the rain sensor and the irrigation controller. It receives signals from the hygroscopic material, processes the rainfall accumulation data, and communicates with the controller to interrupt or resume watering schedules, thereby simplifying the integration between sensor and controller.
2Adaptability or versatility
If manual adjustment of rainfall thresholds is implemented, then adaptability to different environments is improved, but ease of operation deteriorates due to difficulty in accessing and adjusting settings
Solution Approach 1:
The interface unit provides feedback mechanisms to display current rainfall threshold settings and detected rainfall accumulation to the user. This allows users to monitor system status and make informed adjustments to thresholds based on actual environmental conditions and plant water needs.
Solution Approach 2:
The system allows dynamic adjustment of rainfall thresholds through the interface unit, enabling users to modify settings based on changing environmental conditions, plant types, and seasonal variations without requiring system reconfiguration or professional service.
3Loss of substance
If irrigation is interrupted immediately upon detecting rainfall threshold, then water conservation is improved, but reliability decreases due to potential false interruptions from brief rain events
Solution Approach 1:
The system accumulates rainfall data over time using the hygroscopic material before triggering irrigation interruption. This preliminary accumulation phase allows the system to distinguish between significant rainfall events and brief precipitation, ensuring more reliable irrigation control decisions.
Solution Approach 2:
The interface unit dynamically evaluates rainfall accumulation data against configured thresholds and time parameters, allowing flexible adjustment of interruption criteria based on rainfall intensity, duration, and pattern recognition to prevent false interruptions while conserving water.
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
Enables efficient water management by interrupting and resuming irrigation based on real-time rainfall data and temperature, allowing for user-adjustable thresholds and improved water conservation, reducing unnecessary watering and ensuring plants receive adequate moisture.
Implementation Method 1
a rain sensor including hygroscopic material, when a sensed expansion of the hygroscopic material is above a set rainfall accumulation threshold parameter, the rain sensor being separate from the interface unit and the hygroscopic material being configured to expand in response to being contacted by the rainfall and to contract in response to an absence of the rainfall
Data Source
AI summary
Some embodiments provide a system and method for interfacing with an irrigation controller based on rainfall, the system comprising: an interface unit including a housing and a control unit within the housing and configured to: cause an interruption of one or more watering schedules executed by the irrigation controller, which is separate from the interface unit, based on signaling received from a rain sensor including hygroscopic material, when a sensed expansion of the hygroscopic material is above a set rainfall accumulation threshold parameter, the rain sensor being separate from the interface unit and the hygroscopic material being configured to expand in response to being contacted by the rainfall and to contract in response to an absence of the rainfall; and remove the interruption after a completion of a predetermined interval of time after a sensed contraction of the hygroscopic material indicative of a rainfall stop.