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Smart Mattress

Smart Mattress. Bryan Kuo, Priyen Patel, Dev Shah, Xitij Shah, Tim Stamm Georgia Institute of Technology October 23, 2008. Project Overview. Goals: Prevent bedsores acquired on hospital/nursing home beds Wetness Detection Inactivity Detection Prevent incorrect medication administration

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Smart Mattress

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  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

  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

  8. 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. 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

  17. QUESTIONS?

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