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Telemetr-acking

Telemetr-acking. Dan Cwiertak Mike Ehlert Matt Nitz Khun Sok. Project Overview. Goal: Reduce number of errors in medical institutions Where to start? Advances in technology (Bio)Telemetry + Tracking = “Telemetr-acking” How can this be demonstrated? Collect heart rate signal

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Telemetr-acking

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  1. Telemetr-acking Dan Cwiertak Mike Ehlert Matt Nitz KhunSok

  2. ProjectOverview • Goal: Reduce number of errors in medical institutions • Where to start? • Advances in technology • (Bio)Telemetry + Tracking = “Telemetr-acking” • How can this be demonstrated? • Collect heart rate signal • Determine approximate location • Transmit data to central computer • Display data in a graphical user interface (GUI)

  3. Design Approach • Four subsystems: • Vital Sign Data Acquisition • RFID Tracking • Wireless Data Communication • Database/Intuitive GUI • What vital sign and how to collect it? • How to track a person within a building? • How to transmit/receive that data wirelessly? • How to store and display that data?

  4. Top-level Block Diagram RFID Station Tag PC Facility Database PC EKG PC RFID Station

  5. Subsystem 1: Vital Sign Collection • Design choices for Vital Sign Collection: • Body Temperature • Heart Signal • Blood Pressure • Individual tasks of subsystem 1: • Analog Signal Processing • Filtering • Amplification

  6. EKG Block Diagram Signal Pre-amplifier Minimize Interference Amplifier Notch Filter Band Pass Filter DC Offset ADC Transmitter

  7. Subsystem 1: Vital Sign Collection • Analog Signal Processing: • Pre-amplifier (Instrumentation Amplifier AD620) • Eliminate unwanted signal • Right leg common mode negative feedback op amp • Minimize the interference • Band pass filter • 0.05Hz – 150Hz • Notch filter • 60 Hz • DC offset and amplification

  8. Subsystem 2: RFID Tracking • Design alternatives for tracking location: • GPS • Wireless Transmitters • RFID (Passive, Semi-Active, Active) • Low-frequency, high-frequency, ultra-high frequency • Individual tasks of subsystem 2: • Interface with I/O devices • Configure registers of transceiver • Transmission of commands • Reception of responses

  9. RFID Tracking Block Diagram Tag Antenna Microcontroller RFID Transceiver Port Expander LCD Transmitter

  10. Subsystem 2: RFID Tracking • Configuration of MLX90121 registers: • Power, clock, timing, and communication settings • Transmission of Commands (ISO 15693) • Convert command into binary/hex • Convert to ASK 1 out of 4 “symbols” • Transmit the symbols • Reception of Responses (ISO 15693) • Majority Voting • Received as binary data • Interpret/parse the binary string

  11. Subsystem 3: Wireless Communication • Design choices for wireless communication: • IEEE 802.15.4 (LR-WPAN) • ZigBee vs. MiWi vs. Linx • Transmission modules • Frequency choices • Microprocessor • Individual tasks of subsystem 3: • A/D conversion of EKG data • Transmit data between nodes • Processor communication with other subsystems • Receive wireless data

  12. Wireless Comm. Block Diagram Tag’s UID Microcontroller Transmitter Receiver Microcontroller PC Heart Signal Microcontroller Transmitter

  13. Subsystem 3: Wireless Communication • Transmitting/Receiving Data: • Implement MiWi software stack for network creation • Package data for transmission • Interpret and process data • Processor Communication: • USART communication • Between microprocessors • Between computer and microprocessor • SPI communication with wireless module

  14. Subsystem 4: Database/GUI • Design choices of Database/GUI: • LabView • Visual C++ • MATLAB • Individual tasks of subsystem 4: • Receive wireless data as an input • Display the data on GUI • Associate data with patient information

  15. Database/GUI Example

  16. Subsystem 4: Database/GUI • Receive data as input: • 3.3V USB to TTL • Custom communication protocol between LabView and PIC using Serial UART • How data is displayed • Data is processed in LabView • Manipulated to correlate patient info and received data • Put into proper locations to be displayed

  17. Specifications & Results • Specifications: • EKG: 2V peak-to-peak output • RFID: 8 inch read range • Wireless: 30 feet transmission range • Results: • EKG: 1.5-2V peak-to-peak output • RFID: ~5 inch read range • Wireless: >30 feet

  18. Results

  19. Results

  20. Results

  21. Conclusions: • Feasible design in need of improvements • Possible Future Work: • Refine amplifiers and filters • Access control for RFID • Antenna/power design for RFID • Electromagnetic compatibility testing

  22. Acknowledgements • Dr. Weidong Xiang • Dr. “Nattu” (Natarajan) • Dr. John Miller • Jim Kopitzke of Precision Dynamics Corporation • Chris Baird of Digikey • TycoElectronics and Microchip • ECE department

  23. Thank you! Questions? “Questions in life are guaranteed; Answers are not.” -anonymous

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