Motion-Triggered Portable RFID Access Control for Longer Battery Life
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Solution Overview
Problem
Existing access and presence control systems are cumbersome, unreliable, and expensive, failing to distinguish between authorized and unauthorized individuals, with RFID systems suffering from high power consumption and battery life issues.
Innovation Solution
A portable RFID device with a radio frequency transmitter module and accelerometer detects movement to send an identification code only when a threshold is exceeded, combined with a central processing unit to inhibit alarms for authorized subjects, using encrypted communication and low-power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motion sensors and cameras are used to detect unauthorized persons, then the system can detect presence in controlled areas, but the system cannot discriminate between authorized and unauthorized persons, requiring the system to be disabled during authorized person presence
Solution Approach 1:
The system segments the detection function by combining motion detection with RFID identification. The motion sensor triggers RFID reading, which then identifies whether the moving object is authorized or unauthorized. This segmentation allows the system to remain active continuously while accurately discriminating between authorized and unauthorized persons.
Solution Approach 2:
The RFID reader acts as an intermediary between the motion sensor and the control system. When motion is detected, the RFID reader reads the RFID tag and provides identification information, enabling the system to distinguish authorized from unauthorized persons without disabling the detection system.
2Speed
If RFID readers use high power radiation to communicate with transponders, then communication range is improved, but power consumption of transponders increases greatly, reducing battery life
Solution Approach 1:
The RFID reader operates periodically rather than continuously, activating only when motion is detected. This periodic operation significantly reduces the average power consumption of both the reader and the transponder, extending battery life while maintaining effective communication when needed.
Solution Approach 2:
The motion sensor performs preliminary detection before the RFID reader activates. This preliminary action ensures that the high-power RFID communication is only initiated when necessary, preventing unnecessary power consumption and extending battery life.
3Reliability
If RFID transponders are carried by authorized persons for identification, then access control is enabled, but the system becomes complex and expensive
Solution Approach 1:
The RFID transponder serves multiple functions: it provides identification for access control, enables presence tracking, and works with both motion-activated and continuous monitoring modes. This multi-functionality reduces the need for separate systems, simplifying the overall system architecture while maintaining reliable access control.
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
The system reliably and efficiently differentiates between authorized and unauthorized subjects, maintaining constant operation with minimal power consumption, ensuring long battery life and flexible installation across various environments.
Implementation Method 1
the portable RFID device comprises a radio frequency transmitter module connected to an accelerometer that is configured to detect movements of the portable RFID device
Implementation Method 2
the radio frequency transmitter module is configured to recognise when said value of detected acceleration is higher than a minimum threshold and, in this case, to activate for a transmission period a transmission of a radio frequency signal including an identification code
Data Source
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AI summary
Portable RFID device (300), usable in an access and/or presence control system, comprising a radio frequency transmitter module (305) connected to an accelerometer (315) that is configured to detect movements of the portable RFID device (300), wherein the portable RFID device (300) is configured to be powered by a battery (325), wherein the accelerometer (315) is configured to send to the radio frequency transmitter module (305) a value of detected acceleration of the portable RFID device (300), and the radio frequency transmitter module (305) is configured to recognize when said value of detected acceleration is higher than a minimum threshold and, in this case, to activate for a transmission period a transmission of a radio frequency signal including an identification code.