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Wearable Sensors. Final Presentation 05-10-04. Problem Background. MIT Research Affective Wearable Computers. Inferred Transmission (short range) Bulky Design, hard to wear 20 Samples per second. Goals and Objectives. To create a wearable device that reads

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Wearable sensors l.jpg

Wearable Sensors

Final Presentation

05-10-04


Problem background l.jpg
Problem Background

MIT Research

Affective Wearable Computers

  • Inferred Transmission (short range)

  • Bulky Design, hard to wear

  • 20 Samples per second


Goals and objectives l.jpg
Goals and Objectives

To create a wearable device that reads

temperature, skin conductance, and blood

volume pulse and transmits data

wirelessly to a computer, where it will be

displayed in real time.


Expected product layout l.jpg
Expected Product Layout

Blood Volume Pulse (BVP)

Lapaic Wireless Transmitter

Temperature

Galvanic Skin Conductor

Transmission Board Team

Sensors Team

Lapaic Wireless Receiver

GUI

Microcontroller

Software Team


Team overview l.jpg
Team Overview

  • Sensors Team

    • Phillip Hay

    • Rosy Logioia

    • Gouri Shintri

  • Transmission / Microcontroller Board Team

    • Christina Hernandez

    • Clayton Smith

    • Adam Stevenson

  • Software Team

    • Daniel Bishop

    • Josh Handley


Sensors l.jpg
Sensors

BVP Detection and Filtering

BVP Subtraction and Offsetting

Temperature

Galvanic Skin Conductance


Sensors design specs l.jpg
Sensors (Design Specs)

  • Strengths

    • Compact

    • Wearable

    • Low power

  • Weaknesses

    • Poor quality board and parts

    • Sensitive signals

    • Inconsistent signals (BVP)


Transmission board layout l.jpg
Transmission Board Layout

PCB Layout

Schematic


Transmission board design specs l.jpg
Transmission Board (Design Specs)

  • Strengths

    • Size (1.8” square)

    • Potential wireless transceiver and microcontroller on same board

  • Weaknesses

    • Wasted space where Chipcon was originally soldered onto board

    • Separate transceiver / microcontroller boards


Software overview l.jpg
Software Overview

Divided into 2 programs that run concurrently:

  • Cygnal microcontroller

  • PC: The Wearable Sensor Display Utility (WeaSeL)

  • Connected through a USB Connection


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Microcontroller Software

Microcontroller Code:

  • Interrupt Driven

  • Polls data from A/D converter every X seconds.

  • Transmits it to PC via USB using a custom packet protocol.


Mcu to computer usb connection l.jpg
MCU to Computer USB Connection

  • Used to connect the microcontroller to the computer

  • The device uses a simple FIFO interface

  • The high data speed rate coupled with a ~64k byte buffer on the computer, allows for our sensor technology to quickly send large amounts of data points to the computer for processing

  • The device is powered by the computer through the USB connection and therefore no additional power constraints are added to the project

From:

http://www.dlpdesign.com/usb/


Microcontroller usb connection design specs l.jpg
Microcontroller / USB Connection(Design Specs)

  • Strengths

    • C-based IDE

    • Interrupt Driven

      • No wasted clock cycles

      • Easier to maintain code

    • USB

      • High Data Rate

      • Built in Buffering System

      • Easy to integrate w/ .NET C#

      • 1.1 Compliant

  • Weaknesses

    • Microcontroller clock somewhat erratic

    • ADC has some spill over


Weasel l.jpg
WeaSeL

  • Reads data from the USB port

  • “Real time” display of sensor readings, similar to oscilloscope

  • Can save readings to a file for future comparison


Weasel design specs l.jpg
WeaSeL(Design Specs)

  • Strengths

    • Easy to visualize changes in data

    • User-friendly

  • Weaknesses

    • USB buffering may cause WeaSeL to lag or stall


Final product layout l.jpg
Final Product Layout

Blood Volume Pulse (BVP)

GUI

Temperature

Microcontroller

Galvanic Skin Conductor

Lapaic Wireless Transmitter

Software Team

Sensors Team

Transmission / Microcontroller Board Team

Lapaic Wireless Receiver


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Project Status

  • Due to lack of time and equipment, our team was not able to complete wireless transmission of data.

  • The transmission code is currently being reviewed by Laipac Corporation.


Project integration l.jpg
Project Integration

Sensor board hooked up to user and microcontroller

Microcontroller on evaluation board hooked up to USB


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Team Management

Issues

  • Schedule Conflicts

  • Areas of Expertise

  • Time Management (other classes, work, graduation, etc)

    Resolving the Issues

  • Communication

  • Division of Work

  • Weekly Team Meetings



Engineering standards and safety l.jpg
Engineering Standards and Safety

  • Easy to produce because of availability of parts

  • Product is for medical purposes

  • Product is powered by batteries at low voltage

  • Batteries must be disposed of properly to prevent environmental harm


Project sponsors l.jpg
Project Sponsors

This project was completed with the help of the Computer Science Department at Texas A&M University, especially Dr. Ricardo Gutierrez, Dr. Steve Liu, and Dr. Cote from the Biomedical Engineering Department. The project was financially sponsored by Applied Materials and the National Science Foundation.



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