Hygroscopic Rain Sensor Control for Adaptive Irrigation Pauses
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Solution Overview
Problem
Existing irrigation control systems lack the ability to dynamically adjust watering schedules based on rainfall thresholds and temperature, often requiring manual adjustments that are difficult to access and prone to overwatering or underwatering due to fixed threshold settings.
Innovation Solution
A system comprising a rain sensor with hygroscopic material that expands with rainfall and contracts when dry, integrated with an interface unit that communicates with an irrigation controller to interrupt or resume watering schedules based on user-set thresholds and real-time rainfall data, allowing for adjustable thresholds and consideration of temperature and rainfall rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed threshold settings are used in rain sensors, then the system is simple to manufacture, but the system lacks adaptability to different rainfall conditions and requires manual adjustments that are difficult to access
Solution Approach 1:
The patent implements adjustable rainfall thresholds that can be dynamically modified through a user interface, allowing the system to adapt to different rainfall conditions. The controller stores multiple threshold values and allows users to select appropriate thresholds based on specific irrigation needs and rainfall patterns, transforming a static system into a dynamic one.
Solution Approach 2:
The system automatically monitors rainfall conditions and compares them against stored thresholds, autonomously determining when to interrupt or resume irrigation schedules without requiring manual intervention for each decision. The controller self-manages the irrigation control logic based on sensor inputs and predefined parameters.
2Ease of operation
If manual adjustments of rainfall thresholds are required, then the system structure remains simple, but the ease of operation deteriorates due to difficult access to adjustment settings
Solution Approach 1:
The controller serves multiple functions: it acts as both the irrigation control device and the interface for adjusting rainfall thresholds. The user interface is integrated into the controller, allowing users to access and modify threshold settings, view system status, and adjust irrigation schedules through a single device, eliminating the need for separate adjustment mechanisms.
Solution Approach 2:
The patent introduces a wireless communication interface as an intermediary between the user and the controller's internal settings. Users can remotely access and adjust rainfall thresholds through wireless communication, eliminating the need for physical access to the controller's adjustment mechanisms and significantly improving ease of operation.
3Loss of energy
If fixed irrigation schedules are used, then the system is simple to operate, but water waste increases due to inability to respond to actual rainfall conditions
Solution Approach 1:
The system continuously monitors rainfall conditions through sensors and provides feedback to the controller, which automatically adjusts irrigation schedules based on the monitored data. The controller compares actual rainfall against stored thresholds and automatically interrupts or resumes irrigation accordingly, creating a closed-loop feedback system that prevents water waste.
Solution Approach 2:
The irrigation system autonomously responds to rainfall conditions without requiring manual intervention. The controller automatically processes sensor inputs, compares them against thresholds, and executes appropriate irrigation control actions, enabling the system to self-manage water conservation based on real-time environmental conditions.
4Measurement precision
If the rain sensor is integrated with the controller, then the device complexity is reduced, but the measurement precision may deteriorate due to environmental exposure issues
Solution Approach 1:
The system separates the rainfall sensing function from the control function by using a dedicated rain sensor device that communicates with the irrigation controller. This segmentation allows the sensor to be optimally positioned for accurate rainfall measurement while the controller remains protected in a controlled environment, maintaining measurement precision without excessive complexity.
Solution Approach 2:
The patent employs wireless communication as an intermediary between the rain sensor and the controller, allowing the sensor to be positioned remotely in an environment optimal for rainfall detection while transmitting data to the protected controller. This intermediary communication method maintains measurement accuracy while managing system complexity.
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
This system effectively manages irrigation by dynamically adjusting watering schedules based on rainfall and temperature, reducing water waste and ensuring optimal plant hydration, with user-friendly adjustment capabilities and improved water conservation.
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
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.