Capacitive Rain Sensing in Robotic Garden Tool Interfaces
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Solution Overview
Problem
Robotic garden tools face challenges in accurately detecting liquid, such as rain, due to the difficulty in protecting sensors from the environment while ensuring they can accurately sense liquid presence without being obstructed by user interaction.
Innovation Solution
The integration of a capacitance sensor with a sensing surface on the interior of an indented portion of the user interface, which is designed to accumulate liquid and has a surface treated for increased affinity, allowing for accurate liquid detection while being concealed from the user's view and protected from environmental elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor is exposed on the user interface to enable liquid detection, then liquid detection accuracy is improved, but the sensor becomes vulnerable to environmental elements and false triggers from user interactions
Solution Approach 1:
The sensor is nested within a recessed portion of the user interface, creating a protected cavity that shields the sensor from environmental elements while still allowing liquid detection through the recessed surface
Solution Approach 2:
A treatment layer is applied to the recessed surface to increase liquid affinity, acting as an intermediary that enhances liquid accumulation while protecting the underlying sensor from direct environmental exposure
2Reliability
If the sensor is protected from environmental elements by covering it, then sensor reliability is improved, but liquid detection accuracy deteriorates due to obstruction
Solution Approach 1:
The sensor is nested within a recessed portion that provides protection while maintaining detection capability, creating a compromise structure that partially covers the sensor without fully obstructing liquid contact
Solution Approach 2:
The recessed surface receives a specialized treatment to increase liquid affinity locally, ensuring that liquid accumulates in the protected area where the sensor is located, maintaining detection accuracy despite the covered structure
3Ease of operation
If the user interface is designed with indented portions for user interaction, then ease of operation is improved, but the complexity of integrating liquid detection increases
Solution Approach 1:
The liquid detection sensor is merged with the user interface button structure, combining the user interaction element and sensing element into a single integrated component that performs both functions
Solution Approach 2:
The user interface element serves multiple functions: it provides user interaction capability through the indented shape and simultaneously acts as the sensing surface for liquid detection, eliminating the need for separate components
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 solution enables reliable liquid detection, allowing the robotic garden tool to control its operations, such as navigating to a docking station or transmitting notifications, based on the presence of liquid, while avoiding false triggers from user interactions.
Implementation Method 1
The sensor may be configured to sense a capacitance level associated with at least a portion of the user interface
Implementation Method 2
The at least a portion of the user interface of the robotic garden tool may include includes a surface treated to increase an affinity of the surface to liquid to facilitate liquid accumulation on the surface
Data Source
AI summary
Embodiments of the disclosure provide a method, device, and system for detecting liquid contacting a robotic garden tool. The robotic garden tool may include a housing, and a user interface forming part of an outer surface of the housing. The robotic garden tool may also include a sensor coupled to the user interface. The sensor may be configured to sense a capacitance level associated with at least a portion of the user interface. The robotic garden tool may also include an electronic processor coupled to the sensor and configured to control an operation of the robotic garden tool based on an output of the sensor.