Shopping Cart RFID Scanning with Weight Trigger
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Solution Overview
Problem
The time spent during the checkout process in retail stores is significantly prolonged due to the manual removal, sorting, and scanning of items from shopping carts, especially in grocery stores with many items, and there is a need for a solution that minimizes power consumption while ensuring only items present in the cart are detected.
Innovation Solution
A method and apparatus for item scanning in a shopping cart that uses a weight sensor to detect changes in weight, activates an RFID reader to scan RFID tags on items, determines the inventory, and communicates this information to a central server or checkout station via a wireless network, displaying the inventory and enabling efficient checkout processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the RFID reader is continuously active to scan items, then scanning accuracy is improved, but power consumption increases
Solution Approach 1:
The RFID reader operates periodically rather than continuously, activating only when weight change detections indicate items have been added to the cart. This periodic operation maintains scanning accuracy when needed while dramatically reducing overall power consumption during periods when the cart is stationary or being moved without item addition.
Solution Approach 2:
The system uses the weight sensor to automatically trigger RFID scanning only when necessary, eliminating the need for continuous manual monitoring or constant RFID reader operation. The weight change itself serves as the trigger mechanism, making the system self-regulating and energy-efficient.
2Measurement precision
If manual item removal and sorting is performed during checkout, then item verification accuracy is improved, but checkout time increases
Solution Approach 1:
The system performs preliminary scanning of items as they are added to the shopping cart throughout the shopping trip, building an inventory list in advance. This preliminary action eliminates the need for manual item-by-item verification at checkout, significantly reducing checkout time while maintaining accuracy through the pre-established inventory record.
Solution Approach 2:
The patent replaces the manual mechanical process of item removal, sorting, and scanning at checkout with an automated electronic system that uses weight sensors and RFID technology to track items in real-time. This substitution eliminates manual labor at checkout while maintaining or improving verification accuracy through automated tracking.
3Measurement precision
If weight sensing is continuously monitored, then item detection accuracy is improved, but energy consumption increases
Solution Approach 1:
The weight sensor operates in a periodic or event-triggered manner rather than continuous monitoring. It detects weight changes and triggers RFID scanning only when item addition is detected, maintaining high detection accuracy while minimizing energy consumption during periods when no items are being added to the cart.
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 reduces the time spent on checkout by automating the scanning process, ensures accurate inventory tracking, and conserves battery life by maintaining the RFID reader in a low-power state between scans, thereby enhancing operational efficiency and reducing line wait times.
Implementation Method 1
detecting a change in a weight of one or more items within a shopping cart using a weight sensor disposed in the shopping cart
Implementation Method 2
Each of the one or more items may include a radio-frequency identification (RFID) tag. In one embodiment, the method includes switching an RFID reader to an active state and scanning RFID tags of the one or more items with the RFID reader
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A method for item scanning in a shopping cart includes detecting a change in a weight of one or more items within a shopping cart. The weight is sensed by a weight sensor disposed in the shopping cart. Each of the one or more items includes a radio-frequency identification (RFID) tag. The method includes switching an RFID reader to an active state and scanning RFID tags of the one or more items with the RFID reader in response to detecting the change in weight. The RFID reader is disposed on the shopping cart. The method includes switching the RFID reader to an inactive state subsequent to scanning the RFID tags with the RFID reader. The method includes determining an inventory of the one or more items based on information from the scanned RFID tags. The inventory includes an item quantity and an item identity.