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 Adapted from

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 ?

Project Overview Measure Brain Activity (EEG) Translate into signal usable by a device (wheelchair, robotic arm, etc)

Proposed Solution  Reverse engineer two existing inexpensive products –Force Trainer –MindFlex

Proposed Solution  2 Independent Axes –3 Levels of control Off Med High Off Med High Adapted From

Project Overview Measure Brain Activity (EEG) Translate into signal usable by a device (wheelchair, robotic arm, etc)

Electrode Placement Plan ~1in ~4 in ~5 in ~2.5 in  Frontal Lobe –Devices already located  Premotor Cortex –Motor Control (Ohno et al)  Occipital Lobe –Visual stimuli? (Quick, D)

MindFlex

Force Trainer

Electrode Placement  Force Trainer –Occipital Lobe  Mindflex –Frontal Lobe ~1in ~4 in ~5 in

Project Overview Measure Brain Activity (EEG) Translate into signal usable by a device (wheelchair, robotic arm, etc) What inputs can a device read

Device Interaction  Three Levels of Control Per Axis

Microcontroller  What is a Microcontroller –Small computer  Memory  Processing Core  Programmable inputs –true, false

Purpose  One Channel  Three Levels  Two Channels  Two Level

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

Proposed Solution  Existing Products –Force Trainer –MindFlex  Commonalities –NeuroSky Chip

NeuroSky  NeuroSky chip output –DC Motor Control  Pulse width Modulation Fan HighFan MediumFan Off

Neurosky  Increase Brain Activity  Increase Pulse Width Fan High

Project Overview www2.latech.edu Measure Brain Activity (EEG) Translate into signal usable by a device (wheelchair, robotic arm, etc)

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)

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  Voltage Comparator  Supplied Source/Drain

Prototype  BORIS-1 –Tethered –External Power Source –Requires a Desktop PC

Prototype  BORIS-2 –Wireless –Battery Powered

High Cutoff 2V Low Cutoff 1.5V High Cutoff 3.25V Low Cutoff 2.2V Results (BORIS-2) Force TrainerMindFlex

How to use the Device  Output –Pin1/2  Axis 1 –Pin3/4  Axis 2 Microcontroller

How to use the Device  Output –Pin5  GND –Pin6  +9 Volts –Pin7  -9 Volts –Pin8  Digital off –Pin9  Digital on Microcontroller 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

Abolfathi, Peter Puya. Toyota makes a wheelchair steered by brainwaves. 2 July April Blain, Loz. Honda’s Brain-Machine Interface: controlling robots by thought alone. 2 April April Galan, F. et al. “Continuous Brain-Actuated Control of an Intelligent Wheelchair by Human EEG”. ftp://ftp.idiap.ch/pub/papers/2008/galan-grazBCI pdf. Human EEG”. ftp://ftp.idiap.ch/pub/papers/2008/galan-grazBCI pdf. Murph, Darren. Thought-control research brings mental channel changing ever closer. 24 Feb channel-changing-ever-clo/?icid=engadget-iphone-url. 8 April Ohno, K. et al. Analysis of EEG signals in Memory Guided Saccade Tasks. Nagoya Institute of technology. 8 April Provost, Sheldon, J. Lucas McKay. “A real-time EEG Based Remote Control of a Radio -Shack Car”. -Shack Car”. Quick, Darren. What’s on your mind-microelectrodes offer poke free brain control. 3 July April Quick, Darren. Brain to Brain communication over the internet. 6 October April The Local. “Scientists develop helmet to control toy cars via brain waves”. Science & Technology. 19 Jun Technology. 19 Jun Dr. Boris Hyle Park Assistant Professor, Bioengineering A211 Bourns Hall, Riverside, CA Hong Xu, Development Engineer in Bioengineering at UCR A217 Bourns Hall, Riverside, CA Phone: Ron Poutre Ron Poutre Funfly Hobby 6950 Indiana Avenue Suite #1, Riverside, CA References

Questions?

Floating Cutoff Values