1. Smart Mattress Bryan Kuo, Priyen Patel, Dev Shah, Xitij Shah, Tim Stamm Georgia Institute of Technology December 5, 2008

2. Project Overview Goals:  Prevent bedsores acquired on hospital/nursing home beds Wetness Detection Inactivity Detection  Prevent incorrect medication administration Patient Identification System Patient Barcode Display Clients:  Hospitals  Nursing Homes Cost: $1,055

3. Design Objectives 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

4. Overall System - Current

6. Previous RFID System Passive RFID System 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 did not meet our specifications

7. Current RFID System Active RFID System Wavetrend RX201 Active RFID Reader Wavetrend AN100 Active Whip Antenna RFID Operating Frequency: 433 Mhz RFID Antenna Range: 35 ft RFID Wavelength: 2.3 ft Tag Battery Life: 5 years

8. RFID System RFID antenna located at foot of bed Wavetrend Active RFID tags Patient tag compared to patient ID database Patient name and barcode displayed on PC RFID Tag Reader and Antenna HP Slimline PC

9. RFID Detection Range

10. Inactivity Monitoring System

12. Wetness Detection 2 conductive loops of tape connected to wetness detection circuit 1 st comparator input monitors moisture 2 nd comparator detects breaks in the conductive loop

13. Wetness Detection System

14. Phidget 8/8/8 Interface Kit Interface between inactivity monitoring and wetness detection systems with HP Slimline PC 4 analog inputs for FSR strips 1 analog input for sampling wetness detection circuit output

15. Current Status Wetness detection system  2 conductive loops, comparator, and 2 9V batteries  Successfully implemented and tested on breadboard Inactivity monitoring system  4 Trossen Robotics force sensing resistor strips  Controlled through Phidget 8/8/8 interface kit  Successfully implemented and tested RFID System  Wavetrend Active RFID Reader/Antenna  Successfully implemented and tested

16. Design Specifications Same1.5 to 150 psiPressure Sensor Range Same0 to 1000 lbsForce Sensitivity Range Trossen Robotics 24” FSR Same16 msSwitching Loop-time < 5mACurrent Consumption 2 9V batteries3.3 VPower Supply Phidget 8/8/8 Interface KitPIC18 LF2321Microprocessor Multiplexer Max. 0.5 ARFID Current Draw 35 ft.1 ft (12 in.)‏Max RFID Reading Distance N/A1W ± 2 dBRFID Transmitting Power 433 MHz13.56 MHzRFID Operating Frequency RFID Reader Actual ProposedTechnical Specifications

17. Competing Products Total Care SpO2RT Hospital Bed Secure II Med/Surg Hospital Bed $28,500 $10,000

18. Cost $250 1HP Slimline PC $1,055Total Equipment Cost $50 1PC Monitor $30 1Bed Sheet $150 1Mattress Foam $50 75ftConductive Tape $307 1RFID Tag and Reader $15$7.5029V Battery $15 1Wires/Cables $80 1Phidget 8/8/8 $108$274FSR Robotics Sensor Kit Total CostUnit CostQuantityPart

19. Selling Points Lower cost  Costs $1,055  Competitor products cost at least $10,000 Portable More versatile  Combines wetness and inactivity detection  Utilizes RFID to prevent improper medication administration Appealing Graphical User Display

20. Future Considerations Use a smaller, cheaper microcontroller such as a PIC Implement systems on a PCB Find smaller wrist/ankle band active RFID tags

21. PIC Microcontroller Used for integrating wetness detection, inactivity monitoring, and patient identification systems into a low-cost power-efficient package Low power operation using 3V coin cell battery Programmed in C via 6-pin header through PICkit2 RS232 communication to PC using onboard UART Pushbutton and LED for debugging

22. PIC for Inexpensive System Integration RFID  Implement either using RS232 with current reader or SPI enabled reader Inactivity monitoring  Sample force sensing resistors using onboard ADC Wetness detection  Sample output of comparators using digital input LCD for display of system status

23. Demonstration Plan 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