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Electroencephalography control of a Remote Control Car


									Electroencephalogram control of a Remote Control Vehicle

                    Joseph Fletcher
                     Ryan Lacroix
                      Gary Stroup
                   Kenneth Sugerman

           Bioengineering 175- Senior Design
           University of California, Riverside
                   January 13, 2010
Executive Summary
        This project consists of using an electroencephalography (EEG) to measure brain
waves to control a remote control vehicle. The waves will be interpreted for forward and
side to side directional control. The forward direction will be dependent on how fast the
vehicle will move forward. The side to side directional control will steer the vehicle right
and left.

1 Introduction
1.1 Background
        A human’s neurological system transmits information through electrochemical
pathways. Consequently, these electrochemical events can be monitored from the surface
of the skin using electrodes connected to an electroencephalogram (EEG). Because the
occurrence of various types of signals read by the EEG can often be controlled
consciously by a subject, this phenomenon has been invoked in a wide variety of
application; including wheelchair control by paraplegics, video games, and computer
mouse control.

1.2 Purpose
        The proposed design involves reverse engineering already existing single
dimension EEG controllers to produce a two or three dimensional controller for control
of a radio wave controlled vehicle. Previous attempts at projects such as this have
involved extensive training by the subjects or have been quite expensive. The goal here is
to use already existing controllers to significantly reduce cost and, by determining ideal
placements for electrodes, reduce training times. Ultimately, this project will allow for
design of a product for wide scale consumer application.

1.3   Previous work Done by Others

1.3.1 Products Force Trainer
        Dry neural sensors read and interpret brainwaves, mostly beta waves. The
brainwaves are interpreted and transmitted wirelessly to tower and the fan blows air and
causes the ball to rise. Mind Flex
        Like the Force Trainer, the Mind Flex reads brainwaves and transmits it as a
signal to the main console which then activates a fan to elevate the ball. The greater you
concentrate the more power is delivered to the fan and thus the ball rises higher. What has been done by researchers:

Title: Scientists develop helmet to control toy vehicles via brain waves
Applied to:
    - use for people in wheelchairs and prostheses
    - diagnostic work
    - video game controller
To steer the vehicle:
    - the person wearing the helmet views a screen with two chessboard patterns that
blink at different frequencies.
    - Concentrating on the left or right chessboard will move the vehicle in that
      direction. If the person doesn’t focus on either pattern it will travel straight ahead.

Title: A real-time EEG Based Remote Control of a Radio -Shack Car
-used Labview digital IO
-used mosfets instead of switch contacts
        Mosfets is a device used for amplifying or switching electronic signals. The basic
principle of the device was first proposed by Julius Edgar Lilienfeld in 1925. In
MOSFETs, a voltage on the oxide-insulated gate electrode can induce a conducting
channel between the two other contacts called source and drain. The channel can be of n-
type or p-type (see article on semiconductor devices), and is accordingly called an
NMOSFET or a PMOSFET (also commonly nMOS, pMOS). It is by far the most
common transistor in both digital and analog circuits, though the bipolar junction
transistor was at one time much more common.
    - strobe stimulus: light intensity altered
    - analyze mu rythms and measurement from visual cortex
    - quiet and relaxing environment
    - Sinusoidal modulated video files

Title: Continuous Brain-Actuated Control of an Intelligent
Wheelchair by Human EEG
    - 3 subjects were asked to mentally drive wheelchair to 3 locations using 3 mental
    - Turn left, turn right, and move forward
    - 10 trials per target
Results show that mental control of wheelchair can be achieved
1.3.2 Patents
United States Patent                                                              5,638,826
Wolpaw , et al.                                                                June 17, 1997

What does it claim:
       The invention contemplates that brain waves, preferably mu rhythm waves of an
individual, can control a cursor on a video monitor or other device in the environment

United States Patent                                                              4,928,704
Hardt                                                                          May 29, 1990

What does it claim:
       A biofeedback method and system for use to train a person to develop useful
degrees of voluntary control of personal electroencephalogram (EEG) activity.

United States Patent                                                          4,013,068
Settle , et al.                                                         March 22, 1977
What does it claim:
        An EEG activated conrol system responsive to voluntarily or consciously
produced EEG signals encoded to correspond to a plurality of commands.

2 Project Description
2.1 Objective
       The objective of this project is to develop a remote EEG controller system with
multiple axis control.

2.2 Methods
        The first part of the development of the prototype will entail the disassembly of
two previous EEG controlled devices: Mattel’s “Mind Flex Game” and Milton Industry’s
“Star Wars Force Trainer.” These utilize EEG controls in one dimension to determine the
strength of fans intended to lift a ball along the vertical axis to a particular height. These
devices will be reverse engineered to understand the mechanics relevant to their function
including determining which brainwaves are read by these devices. This will then be
manipulated to suit our needs. This portion of the project will be performed with the aid
of an oscilloscope and breadboard with National Instruments ELVIS software.

        The second part entails the determination of which portions of the brain could be
appropriate for control of multiple axes. These portions of the brain should enable easy
control in regards to brainwave activity intensity and should also be able to be controlled
independently. We must also determine if there is continuous control or if signals are
time dependent. We will utilize an EEG as well as consult with faculty in the psychology
department at UCR.
    The final portion of the project would be the actual implementation of our ideal
electrode placement with our EEG controller. We would demonstrate our multiple axis
controller by modifying an RC Vehicle’s controls as well as cursor controls on a

3 Budget
   The estimated required materials for the project
   2 Star Wars Force Trainer        $99 ea            Provided by Dr. Park
   2 Mind Flex Game                 $99 ea            Provided by Dr. Park
   1 Oscilloscope                   $--               Provided by Dr. Park
   1 Multimeter                     $--               Provided by Dr. Park
   1 Pre-amp                        $--               Provided by Dr. Park
   1 Soldering and supplies         $--               Provided by Dr. Park
   1 Remote Control Vehicle         $50
   25 Electrodes                    $50 package
   1 EEG                            $2000             Provided by Dr. Seitz
   1 Elvis II platform by NI        $11000            Provided by Bioengineering Dept
   1 Elvis Breadboard and parts $50
   1 Lab View software              $--               Provided by Bioengineering Dept
   - Wires, clamps, etc             $25
   Total                            $175

   The total estimated cost is $175 which excludes the items provided by Dr. Park’s lab
   and Dr. Seitz. The prices of the products on the market that are roughly similar are
   about $100. Where from our estimation that the prototype will be 35% of our cost is
   $61.25. This is about 40% less than the products that are in the market. The products
   that are on the market can not be fully compared to our product because they are
   much simpler in design.
4 Proposed Time Line
                       Milestones Proposed date of completion

            Create a Brain wave                     Obtain 2 different
            monitoring circuit (or                  consumer EEG
            find an already built                   controllers (2 of each
            EEG). 2/5/10                            type). 1/13/10

            Determine placements                    Open up one of each
            for electrodes that                     type and identify all
            allow for conscious                     necessary signal
            manipulation of brain                   processing
            waves. 4/30/10                          components. 3/12/10

                                                    Modify output of EEG
                                                    controllers to
                                                    manipulate an RC
                                                    controller. 4/30/10

                                     Combine electrode
                                     placement knowledge
                                     with RC controller.

5 References and Sources
   Dr. 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

   Aaron Seitz, Assistant Professor, Psychology
   3101 Psych, Riverside, CA 92521
   Phone: 951-827- 6422

6 Conclusion
       Brain Waves will be measured from an individual to control a remote control

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