1. Smart Mattress Bryan Kuo, Priyen Patel, Dev Shah, Xitij Shah, Tim Stamm Georgia Institute of Technology October 23, 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: $1,600

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 HP Slimline PC Phidget 8/8/8 Interface Kit Wetness Detection Circuit Pressure Sensors RFID

5. RFID System 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

6. 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 may not meet specification requirements

7. Inactivity Monitoring System

9. Wetness Detection Conductive thread connected to wetness detection circuit 1st comparator monitors moisture 2nd comparator detects breaks in conductive tape

10. Wetness Detection System

11. HP Slimline PC PIC Wetness Detection Circuit Pressure Sensors RFID Phidget 8/8/8 Interface Kit From Prototype to Final Design

12. PIC Microcontroller 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

13. PIC for Final System Implementation Inactivity monitoring  Sample force sensing resistors using onboard ADC Wetness detection  Sample output of comparators using digital input Phidgets cost ~$110 versus ~$30 for PIC system

14. Current Status 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

15. 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

16. Project Schedule Acquire Parts9/19/08 Start Testing Wetness Detection10/19/08 Start Testing Inactivity Monitor10/19/08 Develop RFID System11/10/08 Develop Graphical Display11/15/08 Develop PCB11/20/08 Implement the Full System11/30/08

17. QUESTIONS?