Download - Brain Wave Group 1
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Brain Wave Group 1
Final PresentationJames LinSon Phan
Michael Oduselu
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Purpose Research Thought Controlled
Applications Observe how mind control can be
used Open new means of communication Enhance quality of life and mental
well-being
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Potential Applications EEG Biofeedback
Control brain rhythms Computer Control & Communication
Thought controlled systems Entertainment & Virtual Reality
Brain influcenced music and graphics Adaptive Virtual Worlds
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Applications Cont. Education and Research
Brainwave experiments and labs Military and Commercial Applications
Monitor health and concisousness (NASA)
Controlling planes (Air Force) Monitor consumer reactions to Ads and
Products
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Research Background John Chapin
Trained 6 rats to push a lever Computer established pattern for
pushing lever Mice pushed lever with thought
Gloria Calhoun Used brainwaves to pilot a flight
simulator
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EEG Stands for Electroencephalogram Records bioelectric activity of brain Monitors Frequencies from 0.5 to
20 Hz Dependent on brain activity
Age, arousal level, sleeping state, cerebral dysfunctions
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EEG Machines Available Brainmaster
2-channel general purpose brainwave monitor
Performs data storage, retrieval, real-time signal processing, display, and feedback
WaveRider Jr Has Audiovisual feedback More integrated and configured for easy
use but less sophisticated
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EEG Machines Cont. POD
EEG feedback machine Used to improve self in areas ranging
from studying to golf ProComp
8 channel machine capable of EEG, EMG, EKG, skin conductance, temperature, heart rate, etc.
Expensive
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Goals Tackle first task of reading
brainwaves Research and design EEG circuit Assemble EEG circuit Read brainwave on oscilloscope
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Design Objective Build EEG Circuit
Get parts Use BrainMaster schematicsd
Test/Optimize EEG Test for heartbeat Test for brainwave Solder final circuit
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Previous Design
Amplifier didn’t work
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Revised Design
First step: EEG Monitor
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Amplifier Schematic
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Analysis Objectives Understanding Circuit
• Brain-Master Schematic• Part Functions
Implement Circuit in P-spice• Ideal Op-Amps• AD620• OP90
Simulate and Examine Result• Input and Output• Total Gain
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Implement Circuit in P-spice
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Simulate and Examine Result
0
1
2
3
4
5
1 10 100 1000
The Output Voltage
Voltage
Vol
tage
Frequency
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Continued…
0
5000
1 104
1.5 104
2 104
2.5 104
1 10 100 1000
Total Amplifier Gain
Gain
Gai
n
Frequency
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Specifications Type: differential Gain: 20,000 Bandwidth: 1.7 –
34 Hz Input Range
200uV Output Range 4 V CMRR >100dB
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Other components Midpoint Voltage circuit
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Other components Clean power source
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Navigation: Waves vs Emotion
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Heartbeat Test Results Breadboard
circuit measurement of heart beat Second figure
shows a close up. Compare with
EKG
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Assemble working circuit Solder circuit
together for better performance
Cleaner signal with better electrodes and pads
Flat signal = good sign
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Signal from head Tested signal to
amp by biting down.
First capture shows one bite.
Second capture shows 3 bites.
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Measure Brainwaves Results from head
show fluctuating signal between 3 and 30 Hz.
Wave compared to Brainmaster screenshot.
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Brain results cont. Waves look similar Need to use filtering
to isolate frequency energy of wave in a specific time.
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FFT Response FFT shows that range
of frequncies is 0 – 30 Hz
Closer insepection shows a consistant frequency spike around 10 Hz.
Frequency corresponds to Alpha waves at front of head.
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Muscle induced response First capture
shows response of raising eyebrows once.
Second capture shows two eyebrow raises.
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Results continued Capture shows
signal created by a hard blink
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Conclusions EEG amplifier worked well in
collecting signals from the head. Muscles signals were far easier to
see and create. No training involved. Application such as a vehicle
requires instantaneous responses which muscle signals may be better suited for.