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2-Axis Electroencephalogram Controller

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

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2-Axis Electroencephalogram Controller

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  1. 2-Axis Electroencephalogram Controller Dr. Boris Hyle Park Group F Joseph Steven Fletcher Ryan Alan LaCroix Gary Matthew Stroup Kenneth Gerard Sugerman

  2. Presentation Overview • Purpose • Compatible with pre-existing devices • Proposed Solution • NeuroSky • Electrode Placement • Conditioning Circuit • Results • Prototype • Device Use

  3. 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

  4. Purpose • Electroencephalogram (EEG) • Measure net brain activity through voltage measurements by surface electrode • No physical movement necessary

  5. Purpose • Interface Device • EEG Measurements • Brain Activity • Device of choice ? www2.latech.edu http://www.ipmc.cnrs.fr

  6. Project Overview Measure Brain Activity (EEG) Translate into signal usable by a device (wheelchair, robotic arm, etc) http://www.ipmc.cnrs.fr www2.latech.edu

  7. Proposed Solution • Reverse engineer two existing inexpensive products • Force Trainer • MindFlex www.unclemilton.com http://mindflexgames.com

  8. Proposed Solution • 2 Independent Axes • 3 Levels of control • Off • Med • High • Off • Med • High Adapted From http://blogs.static.mentalfloss.com/blogs/archives/22329.html?cnn=yes

  9. Project Overview Measure Brain Activity (EEG) Translate into signal usable by a device (wheelchair, robotic arm, etc) http://www.ipmc.cnrs.fr www2.latech.edu

  10. ~5 in ~1in ~4 in ~2.5 in Electrode Placement Plan • Frontal Lobe • Devices already located • Premotor Cortex • Motor Control (Ohno et al) • Occipital Lobe • Visual stimuli? (Quick, D)

  11. MindFlex

  12. Force Trainer

  13. Electrode Placement ~5 in ~1in ~4 in • Force Trainer • Occipital Lobe • Mindflex • Frontal Lobe

  14. 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

  15. Device Interaction Three Levels of Control Per Axis

  16. Microcontroller What is a Microcontroller Small computer Memory Processing Core Programmable inputs true, false

  17. Purpose One Channel Three Levels Two Channels Two Level

  18. 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

  19. Proposed Solution Existing Products Force Trainer MindFlex Commonalities NeuroSky Chip www.neurosky.com

  20. NeuroSky • NeuroSky chip output • DC Motor Control • Pulse width Modulation Fan Off Fan Medium Fan High

  21. Neurosky Increase Brain Activity Increase Pulse Width http://www.ipmc.cnrs.fr Fan High

  22. Project Overview Measure Brain Activity (EEG) Translate into signal usable by a device (wheelchair, robotic arm, etc) http://www.ipmc.cnrs.fr www2.latech.edu

  23. 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

  24. Conditioning Circuit • Pulse Width to Analog Voltage Magnitude (BORIS-1&2)

  25. Conditioning Circuit Analog to Digital High Cutoff 3.25V Low Cutoff 2.2V

  26. Conditioning Circuit • Analog to Digital • BORIS-1 • LabView Script with ELVIS-1

  27. Conditioning Circuit • Analog to Digital • BORIS-2 • Voltage Comparator • Supplied Source/Drain

  28. Prototype • BORIS-1 • Tethered • External Power Source • Requires a Desktop PC www.unclemilton.com http://mindflexgames.com

  29. Prototype • BORIS-2 • Wireless • Battery Powered

  30. Results (BORIS-2) • Force Trainer • MindFlex High Cutoff 2V High Cutoff 3.25V Low Cutoff 2.2V Low Cutoff 1.5V

  31. How to use the Device • Output • Pin1/2 • Axis 1 • Pin3/4 • Axis 2 Microcontroller

  32. Output Pin5 GND Pin6 +9 Volts Pin7 -9 Volts Pin8 Digital off Pin9 Digital on How to use the Device Microcontroller Supply Voltage Drain Voltage

  33. 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)

  34. Conclusion • Successful in the Proof of Concept • Developed a 2-axis EEG Controller • Live Demonstration

  35. Acknowlegements • Dr. Boris Hyle Park • Assistant Professor, Bioengineering • Hong Xu • Development Engineer • Ron Poutre • FunFly Hobby • Dr. Jerome Schultz • Department Chair, Bioengineering

  36. 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

  37. Questions? http://www.istockphoto.com

  38. Floating Cutoff Values

  39. Floating Cutoff Values

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