1 / 39

V i t a l i s

V i t a l i s. Design Review. Wireless Biometric Sensor. ECE 477 - Spring 2013 TEAM 13. Team Members: Aakash Lamba Di Mo Shantanu Joshi Yi Shen. ECE 477 Design Review Team 13 – Fall 2013. Paste a photo of team members here, annotated with names of team members .

abril
Download Presentation

V i t a l i s

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. V i t a l i s Design Review Wireless Biometric Sensor • ECE 477 - Spring 2013 • TEAM 13 Team Members: AakashLamba Di Mo Shantanu Joshi Yi Shen

  2. ECE 477 Design ReviewTeam 13 – Fall 2013 Paste a photo of team members here, annotated with names of team members. Shantanu Joshi /AakashLamba / Di Mo / Yi Shen

  3. Outline • Project overview • Project specific success criteria • Block diagram • Component Selection Rationale • Packaging Design • Schematic and theory of operation • PCB layout • Software design/development status • Project completion timeline • Questions

  4. Project Overview Prototype of a portable wireless biometric sensor Battery-powered device with fuel gauge Mounted on the wrist Monitor pulse rate, SpO2 and skin temperature Transmit the information via Wi-Fi for remote web access NFC chip allows immediate access to patient data Accelerometer on the shoulder for fall detection Manual and automatic alarm system.

  5. Project-Specific Success Criteria • An ability to determine pulse and SpO2 readings from blood light absorption • An ability to display the users vital statistics (pulse, SpO2 , skin temperature) on the LCD screen mounted on the device which is located on the patients wrist • An ability to remotely monitor the users medical status from a web-site via secure login or authentication through an on-device NFC tag • An ability to activate an alarm both manually (through an emergency button) and automatically  in response to anomalous readings of vitals • An ability to detect if the user has suffered a fall and automatically raise an alarm

  6. Block Diagram

  7. Component Selection Rationale Microprocessor (1) Critical Design Constraints At least 2 UART outputs for WiFi and LCD One or more I2C and SPI (for debugging) connections Operable using internal oscillator (8 MHz or more) Low power consumption (< 20 mA active) Has a well established design tool chain Preferable Design Characteristics Low pin count Large amounts of internal flash/SRAM

  8. Component Selection Rationale Microprocessor (2)

  9. Component Selection Rationale Sensors/Modules (1) General Requirements • Small size • Low cost • Easy to use • 3.3 or 5.0 V • Well documented • Communication via UART or I2C Components • Accelerometer • Temperature • OLED screen • Wi-Fi module • Light to frequency converter

  10. Component Selection Rationale Sensors/Modules (2) • Accelerometer • Analog output • 3.3 V • Easily clipped on shoulder • 3 axis sensing • Low power (350 μA) • OLED Screen • UART communication • 5.0V • Extremely easy to program • Appropriate size for embedded application • Light to Frequency converter • Programmable sensitivity • Extremely small size • Operates in wide range of temperature(-25°C to 75°C) • WiFly Module • Low power - 4 μA sleep and 38 mA active • UART communication • Built in HTML commands to make POST request

  11. Packaging Design (1) Packaging Constraints • Portable- The device must be portable such that a patient may move around while carrying it. It should operate wirelessly so as to enable patient mobility. • Light weight – The device must be light weight. Since the average weight of a smart phone is 120 g, we are targeting something on the order of 100-150g. • Small – The device needs to be small since it needs to be mounted on to the users wrist. We are aiming to make the breadth less than 5 cm. The average wrist is approximately 4.7cm in diameter.

  12. Packaging Design (2) • Philips IntelliVue MX40 • Hung around the neckin a transparent carrying pouch • Touch screen UI • Sensor wires extend across patient’s chest • Entire package (including pouch) is relatively large and cumbersome. • ViSi Mobile health monitor • Worn around the wrist; supported by a band • Touch screen UI • Small and discrete. • Only respiration rate sensor is placed on user’s chest • Aesthetically pleasing

  13. Packaging Design (3)

  14. Packaging Design (4)

  15. Packaging Design (5)

  16. Packaging Design (6) Summary: Size and Weight (main device): Height: 96 mm Width: 50 mm Depth: 10.1 mm Weight (estimated): ~150 grams Components external to device: Pulse oximeter: Clipped on finger Accelerometer: Clipped on to clothing near shoulder Temperature sensor: Underneath the main device mounted on the band   Power module: Attached to the bottom on the neoprene band Packaging requirements: Band material: Neoprene band with Velcro for securing onto wrist Device packaging: Plastic casing

  17. Schematic: Complete Design

  18. Schematic: Section Breakdown Sensors External Interfaces Microcontroller Power and Battery Management

  19. Power Supply Description • Supply Voltage • Lithium Polymer Outputs 3.7 Volts (Nominal) • 3.3 Volts • Microcontroller • Sensors (SpO2, temperature, accelerometer) • Wi-Fi Module • 5 Volts • OLED

  20. Schematic: Power Supply Charger/Booster 5V Step Up Fuel Gauge Headers

  21. Sensor Description Push Button – (Emergency) • Digital Inputs Accelerometer (Analog) • 3 Analog Inputs (3-axis) Temperature (digital) • I2C interface Pulse Oximeter • External Interrupt (Frequency output from photo-sensor) • 2 Digital Outputs • Regular Red LED • Infrared LED

  22. Schematic: Sensors Emergency Push Button Pulse Oximeter Temperature Accelerometer

  23. Wi-Fi and OLED Description • Communicates with microprocessor via UART • Wi-Fi also requires hardware flow control through CTS/RTS • OLED operates at 5V compared to 3.3V for everything else • Wi-Fi and OLED both contain a on-board processor • Wi-Fi module implements handshaking, parsing, and TCP stack creation • OLED handles high-level graphics and programmable updates

  24. Schematic: Wi-Fi & OLED OLED Wi-Fi Wi-Fi Module • UART • TXD0: PD1 • RXD0: PD0 • CTS: PC6 • RTS: PC7 OLED • UART • TXD1: PD3 • RXD1: PD2

  25. Microcontroller Description • Does all on-device data acquisition and processing • Peak detection for pulse • Look-up table for SPO2 • Acceleration processing for fall detection • Temperature conversion • Communicates to website through Wi-Fi via UART interface • Debugging and Programming using standard 10-pin JTAG interface

  26. Schematic: Microcontroller Headers To Power Board I2C Bus SPI ATmega1284 Decoupling Capacitors JTAG

  27. PCB Layout: Overall PCB (3.8 x 3.25) Power Board Main Board

  28. PCB Layout: Top Copper

  29. PCB Layout: Bottom Copper

  30. PCB Layout: Silk Layer

  31. PCB Layout: Power PCB (2.9 x 1.15)(GND Highlighted) Trace Size for 3.3 V, 5 V and GND is 0.032

  32. PCB Layout: Power PCB (2.9 x 1.15) Decoupling Capacitors (C1,C2) for Power Traces Charger/Booster Power Connect Fuel Gauge 5 V Step Up

  33. PCB Layout: Main PCB (3.25 x 2.8)(GND Highlighted) Trace Size: 3.3 V, 5 V and GND - 0.032 Others – 0.012 Hole Size (Diameter): Power - 0.04330709 Others – 0.02362205

  34. PCB Layout: Main PCB (3.25 x 2.8) 5 6 8 10 7 9 3 4 Decoupling Capacitors for Micro: C3,C7,C9 (Size:0805) Decoupling Capacitors for VCC(3.3V)/GND: C10 Decoupling Capacitors for Accelerometer : C4 Decoupling Capacitors for OLED : C5,C8 Decoupling Capacitors for Wi-Fi : C6 (Size:1210) *All passive components are surface-mounted

  35. PCB Layout: Main PCB (3.25 x 2.8)(Debugging Connectors Highlighted) JTAG SPI RESET Power

  36. PCB Layout: Main PCB (3.25 x 2.8)(Sensor Connectors and Others Highlighted) LED SPO2 POWER Wi-Fi OLED BUTTON Temperature Sensor Accelerometer

  37. Software Design • Web Application • Node.js, Express,Jade,Stylus,MongoDB • Login, patient details and DB communication  Done • Improve UI, plotting library and Wi-Fi communication  To Do • Embedded Software • UART up and running • Pulse oximeter processing finished. • ADC,I2C, OLED display, Wi-Fi configuration to be accomplished. • Android application • Programming in eclipse SDK • Login screen, detecting and reading NFC tags  Done • Once web site is hosted, will enable auto-login from the app using NFC authentication

  38. Project Completion Timeline • Week of 2/25: • Focus on embedded software • Get the Accelerometer interfaced with the micro. • Iron out flaws in PCB • Week of 3/4: • Proof of parts • Continue with software development • Week of 3/11: • Host the website • Spring Break!!! • Week of 3/18: • Begin populating the PCB • Finish building OLED display • Finish interfacing all sensors • Week of 3/25: • Continue populating PCB • Get the Wi-Fi updating useful information to the web-server • Enhance the UI for the web-app • Week of 4/1: • Start testing • Arrive at stable version of SW • Week of 4/8: • Debugging • Ethical and Environmental impact • Week of 4/15: • Final tweaks • Prepare demo

  39. Questions?

More Related