Transcript Smart Mattress - Georgia Institute of Technology

Smart Mattress
Bryan Kuo, Priyen Patel, Dev Shah, Xitij
Shah, Tim Stamm
Georgia Institute of Technology
October 23, 2008
Project Overview
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Goals:
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Clients:
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Prevent bedsores acquired on hospital/nursing home beds
 Wetness Detection
 Inactivity Detection
Prevent incorrect medication administration
 Patient Identification System
 Patient Barcode Display
Hospitals
Nursing Homes
Cost: $1,600
Design Objectives
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Identify patients using RFID
Display patient information and barcode
on a PC monitor
Detect moisture and patient inactivity that
could cause bed sores
Alert staff if patient is in danger of
developing bed sores
Overall System - Current
HP Slimline PC
Phidget 8/8/8
Interface Kit
Wetness
Detection
Circuit
Pressure
Sensors
RFID
RFID System
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RFID antenna located at foot of bed
Dynasys RFID tags on patients’ ankles
Patient tag compared to patient ID database
Patient name and barcode displayed on PC
RFID Tag and Antenna
Reader
HP Slimline PC
RFID System
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OBID i-scan HF RFID Reader
OBID i-scan HF Pad Antenna
RFID Operating Frequency: 13.56 MHz
RFID Antenna Range: 7 in.
RFID Transmitting Power: 1W ± 2 dB
* Note: This range may not meet specification
requirements
Inactivity Monitoring System
Inactivity Monitoring System
Wetness Detection
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Conductive thread
connected to wetness
detection circuit
1st comparator
monitors moisture
2nd comparator detects
breaks in conductive
tape
Wetness Detection System
From Prototype to Final
Design
HP Slimline PC
Phidget 8/8/8
Interface Kit
Wetness
Detection
Circuit
PIC
RFID
Pressure
Sensors
PIC Microcontroller
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Low power operation using 3V
coin cell battery and PIC18F2321
Programmed in C via 6-pin
header through PICkit2 using
MPLAB IDE
RS232 communication to PC using
onboard UART
Pushbutton and LED for debugging
PIC for Final System
Implementation
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Inactivity monitoring
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Wetness detection
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Sample force sensing resistors using
onboard ADC
Sample output of comparators using digital
input
Phidgets cost ~$110 versus ~$30 for PIC
system
Current Status
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Wetness detection circuit
 Implemented on breadboard
 2 comparators and 3V battery power supply
 Output tested with multimeter
Inactivity monitoring system
 4 Trossen Robotics force sensing resistor strips with Phidget
voltage dividers
 Sampled with Phidget 8/8/8 Interface Kit and center of mass
calculated using Visual C#
RFID System
 Tested preliminary reader and tag functionality
 Have demonstrated software control in Visual C#, but still
needs further refinement
Demonstration Plan
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Inactivity Detection
 Group member lays for extended period of time.
 LCD monitor displays inactivity alarm
Patient Identification
 RFID tag located within antenna range
 LCD monitor displays patient name
 LCD monitor displays patient medication barcode
Wetness Detection
 Salt water poured on bed
 LCD monitor displays wetness alarm
Project Schedule
Acquire Parts
9/19/08
Start Testing Wetness Detection
10/19/08
Start Testing Inactivity Monitor
10/19/08
Develop RFID System
11/10/08
Develop Graphical Display
11/15/08
Develop PCB
11/20/08
Implement the Full System
11/30/08
QUESTIONS?