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RFID Fall Detection
Floor Mat System
Andrew Heidt
Brian Tippins
Zach Brannan
Abdirizak Mire
Coleman McDaniel
System Overview
Detects patient falls using RFID wrist
and foot tags and an antenna
embedded in a floor mat
Provides monitoring capabilities in
hospitals and elderly care facilities,
where falls are common
Costs $3065 per unit
Design Objectives – All Met
Reliably detect patient falls and egress
Tags reliably detected within 10” to 14” range
Notify staff at a remote monitoring
station using a network connection
Network alerts work successfully
Record incidents in logfile
Log file correctly documents all incidents
Technical Specifications
Proposed
Actual
Max. Read Range
12 to 24 in.
14.6 in.
Frequency Required
13.56 MHz +/- 7
kHz
13.56 MHz +/- 7
kHz
Reader Power
Requirement
> 0.75 W
1W
Mat Size
15 – 30 square ft. 12 square ft.
Weight
< 30 lbs
<15 lbs
Detection Reliability
> 95% Detection
Rate
> 95% Detection
Rate
Specification
System Diagram
Antenna Design
Single Loop Copper
foil antenna
42 in. by 24 in.
Matched to 50 Ω
reader
Matching and Tuning Networks
Matching Network
Input from Interface
Box
Capacitors
Common Mode
Choke
Tuning Network
Output to Antenna
Resistor R1
Variable Capacitor C4
Jumpers
Common Mode Choke
Matching and Tuning Networks
Matching Network
Input from Interface
Box
Capacitors
Common Mode
Choke
Tuning Network
Output to Antenna
Resistor R1
Variable Capacitor C4
Jumpers
Common Mode Choke
VB – Computer Implementation
• Two Software Modules
1.
2.
Local Monitoring Unit - Communicate
locally with reader in/near patient room
Remote Monitoring Station - Provide
capability to monitor multiple patients at
central location
• TCP/IP Information sent includes:
Time stamp
RFID tag ID #
Room #
Computer Interface: Process Flow
Interfacing with Hospital Network
Local Monitoring Unit (LMU) – VB6
• Interfaces with RFID reader (Serial)
• Logs incidents to local text file
• Displays tag detection alerts
• Transmits alerts and resolutions to
remote monitoring station (TCP/IP)
Local Monitoring Unit GUI
Monitoring Window
Tag Detection
Window
Connection Window
Interfacing With Hospital Network
Remote Monitoring Station (RMS) – VB8
• Provides patient table to aid monitoring
multiple patients
• Receives Alerts
Determines alert type (Fall/Egress/Unknown)
Establishes relevant patient and room number
Displays alert window
Resolves remotely from LMU (TCP/IP)
Remote Monitoring Station GUI
Fall Alert
Patient Monitoring Table
Alert
Resolution
Antenna Packaging
Antenna with anti-fatigue floor mat
Low profile floor mat ½” thickness
Antenna size 30” x 48”
Floor mat size 36” x 48” x ½”
Final Product Prototype
Matching network circuit
Adjustable tuning
Floor mat antenna
Costs
Development Costs:
Expected Costs
Parts
Production Costs:
Actual Costs
$1000.00
Development Parts List
RFID Reader
$532.00
Floor Mat
$199.02
Copper Foil
Cables
$30.00
$118.33
Capacitors
$2.10
Resistors
$0.40
Multiplexer
$0.00
Computers
$200
RFID Tags
$15.00
Packaging
$37.00
Total
$1133.85
Parts
$1133.85
Expect Costs
Actual Costs
RFID Reader
$700.00
$532.00
Floor Mat
$100.00
$99.51
Copper Foil
$10.00
$10.00
Cables
$15.00
$40.15
Capacitors
$10.00
$0.70
$2.00
$0.20
$50.00
$0.00
$887.00
$682.56
Resistors
Multiplexer
Total
Selling Price (Based on 25% profit)
Expected Price
Selling Price
$3500.00
Actual Price
$3065.00
Results
Proposed Read Range = 12” – 24”
Actual Read Range
• Average = 11.8”
• Peak = 14.6”
Range is dependent on tag orientation and
location
Experimental Read Range: 0° Orientation
*Units in inches
Experimental Read Range: 45° Orientation
*Units in inches
Experimental Read Range: -45° Orientation
*Units in inches
Experimental Read Range: 90° Orientation
*Units in inches
Wrist Tag Orientation
Due to orientation dependency, two tags
are placed on the wrist to increase read
reliability
Future Work
Automatic tuning will allow one to
achieve maximum read range with a
changing environment
An RFID reader with a higher power
output or a larger antenna would
allow a decrease in wrist tag size
System waterproofing
Antenna embedding
Project Demonstration
VIDEO
Patient falls cost the health care
industry $19.4 billion each year