wearable-final.ppt

8/14/2019 wearable-final.ppt

1/23

Wearable Sensors

Final Presentation

05-10-04


2/23

Problem Background

Inferred Transmission(short range)

Bulky Design, hard towear

20 Samples persecond

MIT ResearchAffective WearableComputers


3/23

Goals and Objectives

To create a wearable device that reads

temperature, skin conductance, and blood

volume pulse and transmits datawirelessly to a computer, where it will be

displayed in real time.


4/23

Expected Product Layout

Lapaic WirelessTransmitter

Blood Volume Pulse(BVP)

Galvanic Skin Conductor

Temperature

Sensors Team

Transmission Board Team

Software Team

Lapaic WirelessReceiver

Microcontroller

GUI
http://webspaces.artic.edu/~cschau/illustrations/computer.gif


5/23

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


6/23

SensorsBVP Detection and Filtering

Temperature

BVP Subtraction and Offsetting

Galvanic Skin Conductance


7/23

Sensors (Design Specs)

Strengths

Compact

Wearable

Low power

Weaknesses

Poor quality board and parts

Sensitive signals

Inconsistent signals (BVP)


8/23

Transmission Board Layout

Schematic PCB Layout


9/23

Transmission Board(Design Specs)

Strengths

Size (1.8 square)

Potential wireless transceiver andmicrocontroller on same board

Weaknesses

Wasted space where Chipcon was originally

soldered onto board Separate transceiver / microcontroller boards


10/23

Software Overview

Divided into 2 programs that runconcurrently:

Cygnal microcontroller

PC: The Wearable Sensor Display Utility

(WeaSeL)Connected through a USB Connection


11/23

Microcontroller Software

Microcontroller Code:

Interrupt Driven

Polls data from A/D converter every Xseconds.

Transmits it to PC via USB using a custom

packet protocol.


12/23


13/23

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


14/23

WeaSeL

Reads data from theUSB port

Real time display ofsensor readings,similar to oscilloscope

Can save readings toa file for futurecomparison


15/23

WeaSeL(Design Specs)

Strengths

Easy to visualize changes in data

User-friendly

Weaknesses

USB buffering may cause WeaSeL to lag orstall


16/23

Final Product Layout

Blood VolumePulse (BVP)

Galvanic Skin Conductor

Temperature

Sensors Team

Software Team

Microcontroller

GUI

LapaicWirelessTransmitter

Transmission /Microcontroller BoardTeam

Lapaic WirelessReceiver
http://webspaces.artic.edu/~cschau/illustrations/computer.gif


17/23

Project Status

Due to lack of time and equipment, ourteam was not able to complete wirelesstransmission of data.

The transmission code is currently beingreviewed by Laipac Corporation.


18/23

Project Integration

Sensor board hooked up touser and microcontroller

Microcontroller on evaluationboard hooked up to USB


19/23

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


20/23

Budget

USB Software $ 22.50

Lapaic Transmission $ 65.00

Transmission / MicrocontrollerBoard Parts

$ 250.00

Board Fabrication Free

Sensor Board Parts $ 105.45

Fabrication of Sensor Boards $ 80.00

Total ~ $512.95


21/23

Engineering Standards andSafety

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 preventenvironmental harm


22/23

Project Sponsors

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


23/23

DemonstrationDouble-click toPlay

wearable-final.ppt

Documents

Transcript of wearable-final.ppt