Vending Machine Interface with Piezoelectric Bending Detection
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Solution Overview
Problem
Vending machines with front panels lacking through holes or selection buttons require a method to detect user product selection without physical buttons or holes.
Innovation Solution
A vending machine interface featuring a planar front panel that bends in response to user input, combined with a product selection panel and pressure sensors, such as piezoelectric elements or strain gauges, to detect bending and determine product selection areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If through holes and selection buttons are used in the front panel, then user selection detection is straightforward, but the front panel structure becomes complex and less durable for outdoor installations
Solution Approach 1:
The invention extracts the selection button components from the front panel, eliminating through holes and protruding buttons. Instead, it uses a flat front panel with pressure sensors embedded in the product selection panel behind it, thereby simplifying the front panel structure while maintaining selection detection capability.
Solution Approach 2:
The invention replaces the traditional mechanical selection button system with a pressure sensor-based detection system. The pressure sensors detect bending of the product selection panel caused by user input, substituting direct mechanical button actuation with a bending detection mechanism.
2Measurement precision
If pressure sensors are used to detect bending, then selection detection accuracy improves, but the system becomes more sensitive to false inputs
Solution Approach 1:
The invention changes the detection parameter from simple pressure presence to pressure magnitude thresholding. The controller is configured to recognize selections only when the pressure exceeds a predetermined threshold, thereby distinguishing intentional selections from accidental touches or environmental factors.
Solution Approach 2:
The system provides visual feedback through illumination of the selected product indication before final selection is confirmed. This allows users to verify their selection intent before the system processes it, preventing erroneous selections from being executed.
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 user selection detection without the need for through holes or selection buttons, preventing erroneous selections and enhancing durability for outdoor installations by using piezoelectric sensors that generate electric charges only upon firm pressing.
Implementation Method 1
A plurality of pressure sensors, each pressure sensor being attached to and associated with a respective product selection area of the product selection panel, each sensor being configured to detect bending of its associated product selection area. The pressure sensors can be, for example, piezoelectric elements and/or strain gauges.
Implementation Method 2
The pressure sensors can be, for example, piezoelectric elements and/or strain gauges.
Data Source
AI summary
A vending machine interface includes a front panel, a product selection panel, and a piezoelectric element. The front panel bends in a normal direction when being pushed by a user. The product selection panel is disposed facing the front panel. A detection element is attached to the product selection panel and configured to detect bending of the front panel.