myDAQ Biomedical Instrumentation Board
description
Transcript of myDAQ Biomedical Instrumentation Board
myDAQ Biomedical Instrumentation Board
Group May1212Jeremy 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