myDAQ Biomedical Instrumentation Board

Group May1212

Jeremy Bruecken, Kossi Sessou, Alex Weiss

Mani Mina - Advisor

Andrew Watchorn - Client

National Instruments myDAQ Low cost portable data acquisition unit Interfaces with NI LabView software Allows students to generate, measure,

and analyze signals in real time

ProjectPlan

myDAQ DetailsProjectPlan

Problem Statement

National Instruments would like an add-on board to the myDAQ that will directly compete with the BioPac at a 40x price margin

The board should provide the necessary connections and LabView interface to allow for measurements done in an introductory Biomedical Engineering course at Iowa State University

ProjectPlan

Market Survey

BioPac currently sole competitor in market

Iowa State recently purchased BioPac kits for introductory class

Our product would be a simple unique solution

ProjectPlan

Functional Requirements

Gain and filter signal from contact patches for EKG and EMG to the myDAQ analog input

Provide user interface for sending, receiving, and analyzing signals in LabView via myDAQ

Protect end user per IEC regulations

Design

Non-Functional Requirements

Simple plug and play hardware interface Provide user friendly software interface

in LabView 40x lower price than BioPac Allow for cheap and reliable manufacture

Design

Concept SketchDesign

Filtering MethodsDesign

Initial design included numerous hardware components

Removed amplifier and passive elements and replaced with software filtering

Lowers cost of product

EKG & EMG Safety

IEC compliant Simple and

effective System is

protected from large voltage spikes

Design

EKG & EMG Measurement

Burr-Brown INA121Application Note

Design

Hardware

Built circuit with passive components to verify System Design

Used external Oscilloscope to verify output

Hardware

Acquired Signal Peaks are present in the acquired signal Very little filtering is included in this

signal

LabView Interface

Capturing the Signals Writes to file for processing

Implementation

Signal Processing and FilteringImplementation

Front End – Acquire and Extract

Finished Board

High Gain amplifier

Easy Connection

HPS shunt diodes

No filtering

Task Breakdown

Jeremy Complete circuit design Perform Spice circuit analysis Hardware

Kossi Create LabView interface Performed interface and hardware testing

Alex Performed hardware testing Design webpage

Things learned

Working with client Obtaining proper documentation Ethics and Proper procedures Meeting deadlines Handling design issues

Conclusion

Digital filtering Vs. Analog Noise issues How can we build upon this project:

Adding more devices Adding functionality to program Increase accuracy

Questions?

myDAQ NI instrumentation learning tool EKG & EMG Filter and Gain Safety

System Diagram