Hygroscopic Rain Sensor Interface for Timed Irrigation Resumption
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Solution Overview
Problem
Existing irrigation systems lack an efficient method to automatically interrupt and resume watering schedules based on rainfall, leading to potential overwatering and water wastage.
Innovation Solution
A system comprising an interface unit that communicates with an irrigation controller and a rain sensor, using hygroscopic material to detect rainfall and adjust watering schedules accordingly, including automatic interruption during rainfall and resumption after a predetermined interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a rain sensor with hygroscopic material is used to detect rainfall and automatically interrupt irrigation, then water wastage is reduced and irrigation efficiency is improved, but device complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
A separate interface unit is introduced as an intermediary between the rain sensor and the irrigation controller. This interface unit receives rainfall data from the sensor, processes the information, and communicates with the controller to interrupt or resume irrigation schedules, thereby reducing water wastage while isolating the complexity of the sensing and control logic from the main irrigation system
Solution Approach 2:
The system automatically detects rainfall through the hygroscopic material sensor and self-manages the interruption and resumption of irrigation schedules without requiring manual intervention. The interface unit autonomously processes sensor data and executes control decisions, eliminating the need for user monitoring and adjustment
2Productivity
If automatic interruption of watering schedules is implemented during rainfall, then water use is optimized, but reliability may be affected by false detection or failure to resume scheduling
Solution Approach 1:
The interface unit continuously monitors the hygroscopic material sensor to detect when rainfall has stopped and the material has contracted. Based on this feedback, the system automatically resumes the interrupted irrigation schedule after a predetermined interval, ensuring reliable operation while optimizing water use during and after rainfall events
Solution Approach 2:
The system implements a predetermined interval delay before resuming irrigation after rainfall detection. This preliminary action ensures that the soil has adequate time to absorb rainfall and prevents immediate re-watering that could cause over-saturation, while also providing a buffer to confirm rainfall has truly ceased before restarting the schedule
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 system effectively manages watering schedules by automatically interrupting irrigation during rainfall and resuming after a set period, thereby optimizing water use and reducing wastage.
Implementation Method 1
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.