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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

Wearable Sensors

Final Presentation


problem background
Problem Background

MIT Research

Affective Wearable Computers

  • Inferred Transmission (short range)
  • Bulky Design, hard to wear
  • 20 Samples per second
goals and objectives
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
Expected Product Layout

Blood Volume Pulse (BVP)

Lapaic Wireless Transmitter


Galvanic Skin Conductor

Transmission Board Team

Sensors Team

Lapaic Wireless Receiver



Software Team

team overview
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

BVP Detection and Filtering

BVP Subtraction and Offsetting


Galvanic Skin Conductance

sensors design specs
Sensors (Design Specs)
  • Strengths
    • Compact
    • Wearable
    • Low power
  • Weaknesses
    • Poor quality board and parts
    • Sensitive signals
    • Inconsistent signals (BVP)
transmission board layout
Transmission Board Layout

PCB Layout


transmission board design specs
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
Software Overview

Divided into 2 programs that run concurrently:

  • Cygnal microcontroller
  • PC: The Wearable Sensor Display Utility (WeaSeL)
  • Connected through a USB Connection
microcontroller software
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
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



microcontroller usb connection design specs
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
  • 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
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
Final Product Layout

Blood Volume Pulse (BVP)




Galvanic Skin Conductor

Lapaic Wireless Transmitter

Software Team

Sensors Team

Transmission / Microcontroller Board Team

Lapaic Wireless Receiver

project status
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
Project Integration

Sensor board hooked up to user and microcontroller

Microcontroller on evaluation board hooked up to USB

team management
Team Management


  • 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
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
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.