Smart Mat Stepping Direction Detection via Piezoresistive Sensing
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Solution Overview
Problem
Existing automatic door systems cannot accurately determine the stepping direction of a person and require high energy consumption for infrared sensing, limiting their functionality and eco-friendliness.
Innovation Solution
A smart mat integrating piezoresistive pressure sensor technology and IoT control, using a stepping potential generation unit with a polymer upper and lower mat and high-resistance strips to generate transition and potential signals, analyzed by a computing processor to determine stepping direction and control device operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If infrared sensing elements are used to recognize stepping direction, then stepping direction can be determined, but energy consumption increases significantly
Solution Approach 1:
The patent replaces the optical infrared sensing system with a mechanical pressure sensing system using film touch type potentiometers. When a person steps on the mat, the pressure mechanically deforms the flexible substrate, changing the resistance of the potentiometer trace and generating voltage signals that indicate both position and direction of stepping, thereby achieving direction detection with minimal energy consumption.
Solution Approach 2:
The patent utilizes changes in electrical resistance parameters of the film touch type potentiometer in response to mechanical pressure. As the flexible substrate deforms under foot pressure, the resistance of the potentiometer trace changes proportionally, converting mechanical pressure into electrical signals that encode position and direction information without requiring continuous power consumption.
2Ease of operation
If pressure sensing device is used to detect stepping, then device operation can be triggered, but stepping direction cannot be determined
Solution Approach 1:
The patent divides the pressure sensing mat into multiple sensing zones with conductive traces arranged in different orientations (e.g., longitudinal and transverse traces). Each zone's trace configuration responds differently to pressure applied at various locations and directions, allowing the system to segment the detection of both position and stepping direction through spatial distribution of sensing elements.
Solution Approach 2:
The patent employs asymmetric trace patterns and conductive film arrangements that produce distinct electrical resistance changes depending on the direction of applied pressure. By designing the potentiometer traces with specific asymmetric geometries and orientations, the system can differentiate between forward and backward stepping directions based on the unique resistance change patterns generated by pressure applied in different directions.
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
Enables precise control of automatic doors and other devices, reduces energy consumption, and enhances living comfort while promoting smart system deployment without additional installation costs or safety concerns.
Implementation Method 1
uses a stepping potential generation unit with a polymer upper and lower mat and high-resistance strips to generate transition and potential signals
Data Source
AI summary
A smart mat includes a stepping potential generation unit, a computing processor and a transmission processor for sensing the stepping direction of a stepper to control the operation of a device. The stepping potential generation unit includes an upper mat, an isolating airgap layer, a lower mat and at least one high-resistance strips. When the stepper stands on the smart mat to press the stepping potential generation unit, a part of the stepping potential generation unit is pressed by an open-circuit state to form a closed circuit and generate a potential. The computing processor uses the distributed position of each potential and the time sequence of distributing each potential to compute and analyse a potential stepping process distribution area to obtain a stepping direction, so as to control the operation of the device through the transmission processor.