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

2. 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

3. myDAQ Details

4. 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

5. 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

6. Functional Requirements
Gain and filter signal from contact patches for EKG and EMG to the myDAQ analog input
Power to two LEDs and collect light transmittance information for pulse oximeter
Provide user interface for sending, receiving, and analyzing signals in LabView via myDAQ
Protect end user per IEC regulations

7. 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

8. Concept Sketch

9. Burr-Brown INA121Application Note
EKG & EMG Measurement
Burr-Brown INA121Application Note

10. EKG & EMG Filter and Gain
ANSI/AAMI EC-11 requires low-pass of 40Hz and high pass filter of .67 Hz
Helps reduce 60Hz power noise
Will limit capability of EMG measurement
Gain of ~2000

11. EKG & EMG Safety Still researching IEC specification
Options include optoelectric isolation, diode shunts, etc.

12. Pulse Oximeter Measurement
Use variation in light transmittance to determine blood oxygen level and pulse
Images Courtesy of freescale.com

13. Pulse Oximeter Measurement
Pulse LEDs to get infrared and red absorption
Gain photodector signal and filter for analysis

14. Images Courtesy of freescale.com
Pulse Oximeter Gain
Use a transimpedance amplifier to generate a voltage signal
Gain will require adjustment depending on finger thickness
Images Courtesy of freescale.com

15. Images Courtesy of freescale.com
Pulse Oximeter Filter
60Hz notch filter
Low pass 6Hz filter
High Pass .8Hz filter
Images Courtesy of freescale.com

16. Pulse Oximeter Analysis
Signal will have AC and DC components
Use only AC to calculate oxygen level
Provides pulse reading
Images Courtesy of freescale.com

17. System Flow Diagram

18. LabView Interface
Easy to use environment for capturing and analyzing biometrics

19. Labview Interface

20. Deliverables Prototype add-on board with sensors
LabView software to collect and interpret data
Design document
Specification test document

21. Project Plan Create design document for December 4th
Review design through Spice testing and analysis
Parts ordered November 15th
Begin hardware testing over break

22. Resource Requirements
Access to BioPac for comparison testing
IEC Safety Documentation
Spice simulation tools
Ability to order devices
Circuit testing equipment (Oscilloscope, DMM, Power supply)

23. Risks Injury when performing tests of human body
Proper safety circuitry will prevent injury
Unable to meet 40x price margin goal
Client is aware this is likely
Inability to compete with BioPac
Focus on price should attract wide customer base

24. Task Breakdown Jeremy Kossi Alex Complete circuit design
Perform Spice circuit analysis
Kossi
Create LabView interface
Perform interface and hardware testing
Alex
Perform hardware testing
Design webpage

25. Questions? myDAQ EKG & EMG Pulse Oximeter System Diagram Project Plan
NI instrumentation learning tool
Add-on board to compete with BioPac
EKG & EMG
Filter and Gain
Safety
Pulse Oximeter
660nm and 940nm light absorption comparison
System Diagram
Project Plan
Resource Requirements
Risks
Tasks