myDAQ Biomedical Instrumentation Board Group May1212 Jeremy Bruecken, Kossi Sessou, Alex Weiss Mani Mina - Advisor Andrew Watchorn - Client

National Instruments myDAQ Project Plan 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

Project Plan myDAQ Details

Project Plan 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

Market Survey BioPac currently sole competitor in market Project Plan 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

Functional Requirements Design 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

Non-Functional Requirements 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 Sketch

Filtering Methods 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 Design EKG & EMG Safety IEC compliant Simple and effective System is protected from large voltage spikes

Burr-Brown INA121Application Note Design EKG & EMG Measurement Burr-Brown INA121Application Note

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 Capturing the Signals Writes to file for processing

Signal Processing and Filtering Implementation

Front End – Acquire and Extract

Finished Board High Gain amplifier Easy Connection HPS shunt diodes No filtering

Task Breakdown Jeremy Kossi Alex 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 System Diagram NI instrumentation learning tool EKG & EMG Filter and Gain Safety System Diagram