BSO Technologies1 of 31 Brain Signal Operated Technologies Brain Signal Controlled Device January...
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Brain Signal Operated Technologies
Brain Signal Controlled Device
January 2007
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Presentation Outline
Project Background Our Product
System Overview High Level Design
Business Case Group Dynamics Conclusion Q&A
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Roles In Project
Heng Wei Lester Lan (COO, CTO) Victor Yu (CEO, CFO) Missing Member 1 Missing Member 2 Missing Member 3 Missing Member 4
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Project Motivation
Neurological diseases Degeneration of nerve cells in brain and spinal cord
Cognitive abilities remain intact 3000 Canadians diagnosed with ALS today 2 to 3 die each day
Offer an alternative way of living for the disabled
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Projection Motivation
http://en.wikipedia.org/wiki/Image:Stephen_Hawking_050506.jpg
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Project Motivation
Conventional Brain-Computer Interface with passive electrodes Sticky gel makes hair messy Long set-up time
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Electroencephalography
Place electrodes on scalp Electrodes detect brain signals
Signals are processed by hardware and software
Alter signals by moving muscles, blinking eyes, sleeping, etc
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System Overview
Modular EEG Easy to set-up 2 channels
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Head Gear
Face shield as head gear Gold pin array as electrode Ear clip as reference electrode
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Pin Electrodes
2X5 gold pin arrays Contact scalp directly Pressure but no/little pain
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Pre-Amplification
Extract brain signals via electrodes
Instrumentation amplifier increases signal strength
Op-amp prevents other body currents from entering instrumentation amplifier
Send to amp stage through a cable and D-sub connectors
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Amplification and Filtering
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Amplification and Filtering
2 second-order low pass filters Amplifier with fixed gain of 100 Amplifier with variable gain of 1-150
AC coupled high pass filter Powered by batteries
Standard DC power supply works too
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PCI Interface
PCI 6024E DAQ 2 outputs from amp stage connect to 2 analog channels in DAQ
Ground signal from amp stage connect to analog input ground in DAQ
Hardware DAQ Software
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Software Implementation
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Software Implementation
Brain signals displayed and analyzed in LabVIEW
DAQ assistant in LabVIEW helped reading signals
Sampled at 1000Hz Further filtered with a 45Hz LPF and a 60Hz notch filter
Filtered signals way cleaner than raw inputs
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Problems Encountered
Electrode placements No prior biomedical knowledge
Low voltage signal Interfered by noise
Hard to control brainwaves Cannot turn on op-amps
AD625 -> INA128 LabVIEW sampling rate
Long delay time if requesting too many samples
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Results
Raw Brainwaves Filtered Brainwaves
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Results
Desired EEG Our EEG
http://en.wikipedia.org/wiki/Image:Eeg_raw.svg
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Results – Sleepy but Awake
Alpha Low Beta
High Beta Gamma
Delta Theta
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Marketing Plan
Targeting markets Researchers Hospitals People with disabilities
Provide on-site training Start in North America and expand worldwide
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Budget
Component CostHead Gear $20.00
Electrodes $14.82
Power Supply $9.01
Interface Box $9.14
Electronics $62.90
Connections $15.14
Tools $13.45
LabVIEW and DAQ (~$1,500) BorrowedMiscellaneous $23.25
Total $167.71
Total Project Expense: $360.28
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Selling Price
Possible unit manufacturing cost of <$50
Unit selling price of ~$100 Much lower than that of commercial complex EEG systems
Raise price as more features are being added
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Potential Competitors
Many commercial EEG systems exist Futherhealth.org
EEG system with 500 displays Costs $3,450
WaveRider Pro Biofeedback system with 4 channels reading from brain, heart, and muscles
Costs $1,700
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Group Dynamics
Formed in summer 2006 Started with 6, ended up with 2
Group communications Caucus -> Email -> Phones
Group meetings 3 times a week Late or no show
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Group Dynamics
Group Members Leaving Simply disappear No pre-requisite Afraid of too much work Family problems/Co-op
Individual Tasks Not done Lied to others by saying tasks were done
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What We Learned
Technical Skills Biological structure of the brain Hardware assembly
Soft Skills Team work
Expect the unexpected Contingency Plans
Working in groups of 2, 3, 4, 5, and 6
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Future Work
PONG game! More signal analysis in LabVIEW Store different brainwaves for different thoughts
Two players competing against each other Brain-controlled toys
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Conclusion
Acquired various technical and communication skills
(Kind of) overcame the collapse of the group
Product may one day help the disabled
Fun, educational, and frustrating…
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Acknowledgements
Brad Oldham Troy Tyler Andrew and Steve’s extension Ex-group members Anyone who saw our group’s disaster and offered help
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Questions?