Plant Capacitive Interface Module With Adjustable Touch Threshold
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Solution Overview
Problem
Existing systems for detecting user interactions with living plants face challenges in maintaining accurate calibration due to the plant's shape and size changes, as well as variations in the substrate, leading to unreliable detection over time.
Innovation Solution
A detection module that measures capacitance variations using electrodes and capacitive sensors, with a control unit that adjusts a threshold value via a potentiometer and applies moving average algorithms to stabilize readings, and includes a hub for interconnecting multiple modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If impedance measurement is used to detect user interactions with plants, then the system can detect user presence and actions, but the detection accuracy deteriorates over time due to plant shape changes and substrate variations
Solution Approach 1:
The system dynamically adjusts the threshold value for detection based on the plant's natural capacitance characteristics. A potentiometer allows real-time calibration of the threshold to match the specific plant's electrical properties, enabling the system to adapt to variations in plant shape, size, and substrate conditions while maintaining reliable detection of user interactions.
Solution Approach 2:
The invention changes the measurement parameter from impedance to capacitance, and further transforms capacitance values to voltage values for comparison. This parameter transformation enables more stable and reliable detection by comparing voltage values against a calibrated threshold, reducing the impact of plant physical variations on measurement precision.
2Device complexity
If a fixed threshold is used for detecting capacitance changes, then the system structure is simple, but false detections increase due to plant natural variations
Solution Approach 1:
The threshold value is made adjustable through a potentiometer, allowing it to be dynamically calibrated to match the specific plant's natural capacitance characteristics. This simple dynamic adjustment mechanism enables the system to adapt to different plants and their variations without requiring complex algorithms or multiple sensors.
Solution Approach 2:
The system allows users to manually calibrate the threshold value themselves by adjusting the potentiometer based on the plant's natural state. This self-service calibration approach eliminates the need for complex automated calibration systems while enabling accurate detection tailored to each specific plant.
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
Provides reliable and accurate detection of user interactions by calibrating to the plant's natural capacitance, reducing false positives through dwell and holding time measurements, and enabling stable communication with external devices.
Implementation Method 1
one or more capacitive sensors in electrical communication with the electrodes, configured to measure capacitance through the electrodes and convert it to voltage values
Data Source
AI summary
It is presented a detection module (10) for detecting capacitance variations in a plant (20), comprising one or more electrodes (11) configured and arranged to be put in electrical communication with the plant (20), one or more capacitive sensors (12) in electrical communication with the electrodes (11), configured to measure capacitance through the electrodes (11) and convert it to voltage values, a control unit (13) in communication with each capacitive sensor (12), having at least one electrical or wireless communication port (14′, 14″) to other detection modules (10) or to external devices (0), and being configured to read said voltage values, process them for obtaining processed voltage values, compare said processed voltage values with a threshold value, and send a control signal to one or more external devices (0) via said at least one communication port (14′, 14″) when said processed voltage values exceed the threshold value, and a user-accessible potentiometer (15) in electrical communication with the control unit (13), the potentiometer (15) being configured to adjust said threshold value. It is also presented an interface system and a method for detecting interactions of a user with a living plant and communicating control signals using at least one of said detection module (10).