Multi-Directional Water Sensor with Segmented Conductive Pads
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Solution Overview
Problem
Conventional water sensors are limited in their ability to detect water from any direction, restricting their placement to specific orientations and locations, which can lead to missed detections in various environments.
Innovation Solution
A multi-directional water sensor design featuring a housing with multiple conductive pads and a biasing circuit that allows electrical current to flow between distinct groupings of pads when connected by a thin layer of surface water, triggering an alarm, and is powered only when water is detected, enabling reliable detection regardless of orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional water sensors are used with single conductive pads, then the device complexity is low, but the adaptability to different orientations and locations is limited
Solution Approach 1:
The sensor is segmented into multiple conductive pads (at least two) distributed across different surfaces of the housing. Each pad can independently detect water contact, allowing the sensor to function regardless of orientation. This segmentation enables placement flexibility while maintaining relatively simple device complexity.
Solution Approach 2:
The sensor housing is designed to detect water from multiple directions and orientations simultaneously. The conductive pads are positioned on different surfaces (top, bottom, sides) so the sensor can detect water leakage regardless of how it is oriented or placed, making it universally applicable to various installation scenarios.
2Adaptability or versatility
If multiple conductive pads are added to enable multi-directional detection, then the adaptability improves, but the device complexity increases
Solution Approach 1:
Multiple conductive pads are electrically connected through conductive traces on the housing to form functional groups. The housing itself serves as both the structural element and the conductive pathway, merging the structural and electrical functions into a single integrated design, thereby reducing overall device complexity.
Solution Approach 2:
The conductive pads are distributed across three-dimensional surfaces of the housing rather than being confined to a single plane. This spatial arrangement allows water detection from multiple directions (top, bottom, sides) and orientations, enhancing detection capability without significantly increasing complexity.
3Reliability
If the sensor is powered continuously to ensure immediate detection, then the reliability of detection is high, but the energy consumption increases
Solution Approach 1:
The sensor employs periodic polling of the conductive pads rather than continuous monitoring. The microcontroller checks for water presence at intervals, consuming power only during these polling cycles. This periodic action maintains detection reliability while significantly reducing average power consumption compared to continuous monitoring.
Solution Approach 2:
The sensor leverages the natural conductivity properties of water to trigger detection. When water contacts the conductive pads, it automatically creates an electrical pathway that the polling circuit can detect, eliminating the need for active heating or other energy-intensive detection methods.
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 multi-directional water sensor effectively detects water presence in diverse orientations and locations, reducing false negatives and enhancing placement flexibility while conserving power until water is detected.
Implementation Method 1
Water sensors or sensors are used to detect water leaks by sensing the presence of water in contact with two spaced conductive pads. If water comes into contact with both conductive pads, an audible alarm is sounded to warn the user that water is present in the location of the sensor.
Implementation Method 2
A multi-directional water sensor includes a biasing circuit that monitors a resistance between at least two distinct groupings of multiple conductive pads. A low resistance is sensed when a first grouping of the at least two distinct groupings of the multiple conductive pads and a second grouping of the at least two distinct groupings of the multiple conductive pads are electrically connected by a thin layer of surface water.
Data Source
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Figure 4A~4B
Figure 5
AI summary
A multi-directional water sensor comprises a housing having multiple conductive pads on the outer surface of the housing at locations spaced around the periphery of the housing, an electrical power source located inside the housing, a buzzer located inside the housing, and multiple electrical conductors located inside the housing and connecting multiple pairs of the contacts so that electrical current can flow between different pairs of the contacts when they are connected by water. The buzzer produces a sound when electrical current flows between any pair of the contacts.