2-Axis Electroencephalogram Controller

Report
2-Axis
Electroencephalogram
Controller
Dr. Boris Hyle Park
Group F
Joseph Steven Fletcher
Ryan Alan LaCroix
Gary Matthew Stroup
Kenneth Gerard Sugerman
Presentation Overview

Purpose
– Compatible with pre-existing devices

Proposed Solution
– NeuroSky
– Electrode Placement
– Conditioning Circuit

Results
– Prototype
– Device Use
Purpose
 Produce
a two dimensional
Electroencephalogram (EEG) controller for
widespread application
– Mechanical arm
– Hands free light for Dentist
– Wheel Chair
Adapted from www.toysrus.com
Adapted from www.fotosearch.com/bthumb
http://blogs.static.mentalfloss.com
Purpose
 Electroencephalogram
(EEG)
– Measure net brain activity through voltage
measurements by surface electrode
– No physical movement necessary
Purpose
 Interface
Device
– EEG Measurements
 Brain
Activity
– Device of choice
?
www2.latech.edu
http://www.ipmc.cnrs.fr
Project Overview
Measure
Brain
Activity
(EEG)
http://www.ipmc.cnrs.fr
Translate into
signal usable
by a device
(wheelchair,
robotic arm,
etc)
www2.latech.edu
Proposed Solution
 Reverse
engineer two existing
inexpensive products
– Force Trainer
– MindFlex
http://mindflexgames.com
www.unclemilton.com
Proposed Solution

2 Independent Axes
– 3 Levels of control
•Off
•Med
•High
Adapted From
http://blogs.static.mentalfloss.com/blogs/archives/22329.html?cnn=yes
•Off
•Med
•High
Project Overview
Measure
Brain
Activity
(EEG)
http://www.ipmc.cnrs.fr
Translate into
signal usable
by a device
(wheelchair,
robotic arm,
etc)
www2.latech.edu
Electrode Placement Plan
 Frontal
~5 in
~1in ~4 in
~2.5 in
Lobe
– Devices already
located
 Premotor
Cortex
– Motor Control
(Ohno et al)
 Occipital
Lobe
– Visual stimuli?
(Quick, D)
MindFlex
Time of Maintaining a Level
(seconds)
30
25
20
15
Frontal Lobe
Premotor Cortex
Occipital Lobe
10
5
0
High
Low
Fan Speed
Off
Force Trainer
Time of Maintaining a Level
(seconds)
25
20
15
Frontal Lobe
Premotor Cortex
10
Occipital Lobe
5
0
High
Low
Fan Speed
Off
Electrode Placement
 Force
Trainer
– Occipital Lobe
 Mindflex
– Frontal Lobe
~5 in
~1in ~4 in
Project Overview
Measure
Brain
Activity
(EEG)
Translate into
signal usable
by a device
(wheelchair,
robotic arm,
etc)
What inputs
can a device
read
http://www.ipmc.cnrs.fr
www2.latech.edu
Device Interaction
Levels of Control Per Axis
Output vs. Tim e
3
2
Output (mV)
 Three
1
0
0
10
20
-1
Tim e (sec)
30
40
50
Microcontroller
 What
is a Microcontroller
– Small computer
 Memory
 Processing
Core
 Programmable inputs
– true, false
Purpose
One Channel
 Three Levels
Two Channels
 Two Level


High Cutoff
Output vs. Tim e
Output
1
3
0
0
10
20
30
40
50
40
50
Tim e (sec)
1
Low Cutoff
0
1
0
10
20
30
40
50
Output
Output (mV)
2
-1
Tim e (sec)
0
0
10
20
30
Tim e (sec)
Project Overview
Measure
Brain
Activity
(EEG)
Translate into
signal usable
by a device
(wheelchair,
robotic arm,
etc)
What do the
Brain Activity
Measurements
give us
http://www.ipmc.cnrs.fr
www2.latech.edu
Proposed Solution
 Existing
Products
– Force Trainer
– MindFlex
 Commonalities
– NeuroSky Chip
www.neurosky.com
NeuroSky
 NeuroSky
chip output
– DC Motor Control
 Pulse
Fan Off
width Modulation
Fan Medium
Fan High
Neurosky
 Increase
Brain Activity
 Increase
Pulse Width
http://www.ipmc.cnrs.fr
Fan High
Project Overview
Measure
Brain
Activity
(EEG)
http://www.ipmc.cnrs.fr
Translate into
signal usable
by a device
(wheelchair,
robotic arm,
etc)
www2.latech.edu
Conditioning Circuit
 Two
Characteristics
– Pulse width to Analog Voltage
Magnitude
– Analog to Digital (2 bit)
 Prototype:
Brain Operated Remote
Interface System (BORIS)
– BORIS-1
– BORIS-2
Conditioning Circuit
 Pulse
Width to Analog Voltage
Magnitude (BORIS-1&2)
+9V
+9V
+9V
Vin +
-
-
-
Vin -
+
+
+
-9V
-9V
Vout
-9V
Conditioning Circuit
 Analog
to Digital
High Cutoff 3.25V
Low Cutoff 2.2V
Conditioning Circuit
 Analog
to Digital
– BORIS-1
 LabView
Script with ELVIS-1
Conditioning Circuit

Analog to Digital
– BORIS-2
Vss
 Voltage
Comparator
 Supplied
Source/Drain
Vin
-
Vout
1
+
Vdd
+9V
Vss
-
Vout
2
+
Vdd
+9V

BORIS-1
Prototype
– Tethered
– External Power Source
– Requires a Desktop PC
http://mindflexgames.com
www.unclemilton.com
Prototype
 BORIS-2
– Wireless
– Battery Powered
Results (BORIS-2)
Force Trainer
High Cutoff 2V
Low Cutoff 1.5V
MindFlex
High Cutoff 3.25V
Low Cutoff 2.2V
 Output
– Pin1/2
 Axis
1
– Pin3/4
 Axis
2
Microcontroller
How to use the Device
How to use the Device
Output
– Pin5
Microcontroller

 GND
– Pin6
 +9
Volts
– Pin7
 -9
Volts
– Pin8
 Digital
off
– Pin9
 Digital
on
Supply
Voltage
Drain
Voltage
Future Work
 BORIS-3
– Floating cutoff values
– Use the NeuroSky chip only
 As
opposed to integrated into a
MindFlex/Force Trainer circuit board
– Have circuit printed on a circuit board
 Improved
efficiency (size, power)
Conclusion
 Successful
in the Proof of Concept
– Developed a 2-axis EEG Controller
 Live
Demonstration
Acknowlegements
 Dr.
Boris Hyle Park
– Assistant Professor, Bioengineering
 Hong
Xu
– Development Engineer
 Ron
Poutre
– FunFly Hobby
 Dr.
Jerome Schultz
– Department Chair, Bioengineering
References
Abolfathi, Peter Puya. Toyota makes a wheelchair steered by brainwaves. 2 July 2009.
http://www.gizmag.com/toyota-wheelchair-powered-brain-waves/12121/. 8 April 2010.
Blain, Loz. Honda’s Brain-Machine Interface: controlling robots by thought alone. 2 April 2009
http://www.gizmag.com/honda-asimo-brain-machine-interface-mind-control/11379/.
8 April 2010.
Galan, F. et al. “Continuous Brain-Actuated Control of an Intelligent Wheelchair by
Human EEG”. ftp://ftp.idiap.ch/pub/papers/2008/galan-grazBCI2008-2008.pdf.
Murph, Darren. Thought-control research brings mental channel changing ever closer. 24 Feb.
2010. http://www.engadget.com/2010/02/24/thought-control-research-brings-mental
-channel-changing-ever-clo/?icid=engadget-iphone-url. 8 April 2010.
Ohno, K. et al. Analysis of EEG signals in Memory Guided Saccade Tasks. Nagoya Institute
of technology. http://www.springerlink.com/content/q647qh703mpl4352/fulltext.pdf.
8 April 2010.
Provost, Sheldon, J. Lucas McKay. “A real-time EEG Based Remote Control of a Radio
-Shack Car”. http://www.lems.brown.edu/~scp/eegremotecontrolcar.pdf.
Quick, Darren. What’s on your mind-microelectrodes offer poke free brain control. 3 July 2009.
http://www.gizmag.com/brain-microelectrodes/12141/. 8 April 2010.
Quick, Darren. Brain to Brain communication over the internet. 6 October 2009.
http://www.gizmag.com/brain-to-brain-communication/13055/. 8 April 2010.
The Local. “Scientists develop helmet to control toy cars via brain waves”. Science &
Technology. 19 Jun 2008. http://www.thelocal.de/sci-tech/20080619-12577.html.
Dr. Boris Hyle Park Assistant Professor, Bioengineering
A211 Bourns Hall, Riverside, CA 92521
Hong Xu, Development Engineer in Bioengineering at UCR
A217 Bourns Hall, Riverside, CA 92521
Phone: 951-827-7235
Ron Poutre
Funfly Hobby
6950 Indiana Avenue Suite #1, Riverside, CA 92506
Questions?
http://www.istockphoto.com
Floating Cutoff Values
Brain Activity vs. Time
Brain Activity (Voltage)
8
7
6
5
4
Brain Activity
3
Cutoff
2
1
0
0
10
20
30
Time (sec)
Voltage
Digital Output
1.5
1
0.5
0
Output
24, 0
0
10
20
Time (sec)
30
Floating Cutoff Values
Brain Activity vs. Time
Brain Activity (Voltage)
8
7
6
5
4
Brain Activity
3
Cutoff
2
1
0
0
10
20
30
Time (sec)
Voltage
Digital Output
1.5
1
24, 1
0.5
Output
0
0
10
20
Time (sec)
30

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