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Wearable Wireless Physiological Sensors

Wearable Wireless Physiological Sensors. Daniel Bishop Rosy Logioia Josh Handley Gouri Shintri Phillip Hay Clay Smith Christina Hernandez Adam Stevenson.

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Wearable Wireless Physiological Sensors

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  1. Wearable Wireless Physiological Sensors Daniel Bishop Rosy Logioia Josh Handley Gouri Shintri Phillip Hay Clay Smith Christina Hernandez Adam Stevenson

  2. Goals and Objectives • Measure blood volume pulse • Measure skin resistance • Measure temperature • Record measurements on wearable device unit • Transmit measurements wirelessly to a computer • Display measurements on Graphical User Interface in real time

  3. Recent Issues • BVP Sensor – Correctly amplifying and filtering signals • GSR – Reverse engineering safely • Convert bulky circuit into small and wearable device • Understanding Eagle • Size and availability of parts • Compatible design to Dr.Liu’s requirements • Getting Chipcon to process information • Debugging hardware

  4. Sensors Team - Goals • Objectives – To Do • Properly filter BVP signal with 2nd order low pass filter • Reverse engineer GSR sensor • Condense circuits into wearable item • Integrate sensors and board • Test / Debug integration • Integrate sensors / board with software • Test / Debug complete configuration • Present final product • Objectives – Done • Reverse engineer BVP sensor • Reverse engineer temperature sensor • Calibrate and test temperature sensor

  5. Temperature – Circuit

  6. Temperature – Calibration

  7. Thermometer Positions Temperature ◦F Measured Voltage V Calculate Voltage V % Error Gouri’s palm 91.6 .314 .314 0 Zach’s palm 97.2 .442 .431 2.55 Di’s palm 96.4 .403 .414 2.66 Di’s fingers 94.9 95.9 .340 .360 .383 .404 11.22 10.89 Temperature – Testing

  8. Pulse Oximetry – Circuits  LED Circuit Photovoltaic Circuit 

  9. Skin Resistance • Waiting on extra samples to arrive • Reverse engineer sample to learn how GSR sensors work • Build a working prototype on breadboard using knowledge and information from sample • Calibrate sensor • Proposed skin resistance circuit

  10. Board Design Team - Goals • Objectives – Done • Comprehension of Chipcon 2400 and Microcontroller • Board Schematic (Eagle) • Research Parts – Size and $$ • Objectives – To Do • Test schematic • Send off schematic for board creation • Integrate sensors and board • Test / Debug integration • Integrate sensors / board with software • Test / Debug complete configuration • Present final product

  11. Board Design • Microcontroller • 32 I/O Pins • 8 analog inputs pins (100 ksps) • Max amplification = 16, variable • UART (Built-In) • Chipcon CC2400 • 4 pin SPI bus • 6 optional digital interfaces • 3 pin antenna connection • 2.4 GHz transceiver Microcontroller and Chipcon 2400

  12. Custom Circuit Board

  13. PCB Layout

  14. Software Team - Goals • Objectives – To Do • Transmission software • Receiving Software • USB software • GUI • Integrate software with sensors / board configuration • Test / Debug complete configuration • Present final product • Objectives – Done • Comprehension of Chipcon 2400 and Microcontroller • Analog input software

  15. Analog Input • Code • Initialize timer • Poll sensors continuously • Convert to digital signals • Testing • Signal generator

  16. Communication • Code • Initialize Chipcon registers/clock • Construct/Transmit packets • Testing • Writing/Reading chipcon registers • Set up multiple Chipcon EBs

  17. Questions?

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