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Electroencephalogram control of a Remote Control Vehicle By 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 188.8.131.52 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. 184.108.40.206 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. 220.127.116.11 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 commands - 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 computer. 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. 5/12/10 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 vehicle.
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