human computer interfacing

7/24/2019 human computer interfacing

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1) Introduction

2) Problem definition

3) Literature Review

3) Comparison of different HCI

4) Sstem overview

!) "#$ Si%nal detection and amplification

&) 'etail of (*"$( 1& board

+) (rc,itecture of (*"$( 1& CP-

.) Re/uirement analsis

0) Conclusion

1) References

Contents


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( braincomputer interface CI)5 often called a mind6mac,ine

interface **I)5 or sometimes called a direct neural interface or a brain

mac,ine interface *I)5 is a direct communication pat,wa between t,e

brain and an e7ternal device8 ,e idea of rain6Computer Interfaces CIs) w,ic, allow t,e control of

devices usin% brain si%nals evolved from t,e realm of science fiction tosimple devices t,at currentl e7ist8

CIs naturall present t,emselves to man e7tremel useful applications

includin% prost,etic devices5 restorin% or aidin% in communication

Most research investigating BCI in humans has used scalp-

recorded electroencephalography or intracranialelectrocorticography. The use of brain signals obtaineddirectly from stereotactic depth electrodes to control a BCIhas not previously been explored.

Introduction


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Proposed sstems will detect t,e variations in electric si%nal stren%t,

t,rou%, volta%e level near t,e ee area and %enerates a wireless radio

fre/uenc si%nals in order to control t,e robotic prototpe model8

implementin% t,is sstem we can furt,er e7tend it to bio enabled

,uman bod parts to control t,rou%, brain waves8 Computer cursor and application control: Li9ewise user can control

t,e computer cursor and t,e applications usin% electric si%nals8

Wireless robotic vehicle design:Proposed sstem includes t,e

wireless robotic ve,icle w,ic, can be controlled in 4 different

directions8 -ser can ,ave access to t,is ve,icle usin% radio fre/uencenabled circuitr t,rou%, brain si%nals %enerated usin% ee motion

Problem definition


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Sr.

No

Title of Paper Authors Work

1 Stud on ""$6ased*ouse Sstem b -sin%rain6Computer Interface5I"""213 )

'on% *in%5:u,uan ;,u5Hon%an

,is paper aimed to desi%n an ""$6basedmouse sstem b control c,annel forpatientswit severe motor disabilities8 Suc,patients mi%,t become able to select tar%eton a computer monitor b movin% a cursor

t,rou%, mental activit8usin% CI) tomove cursor on a computer displa8 ,issstem to provide an alternativecommunication8

2 "#$6based si%naldetection and verification

for HCII"""213)

Lawrence :8'en%15 C,un6

lian% Hsu25


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EEG, EOG, EMG


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What is EOG

1. lectrooculography "#$%.#.$.& is a techni'ue

for measuring the corneo-retinal standingpotential that exists bet(een the front and thebac) of the human eye.

2. The resulting signal is called the

electrooculogram. *rimary applications are inophthalmological diagnosis and in recordingeye movements.

+. To measure eye movement, pairs of electrodes

are typically placed either above and belo(the eye or to the left and right of the eye.

. If the eye moves from center position to(ardone of the t(o electrodes, this electrode seesthe positive side of the retina and the oppositeelectrode sees the negative side of the


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Human-computer

nterface

!escription comparison

/oice recognition 0ecognie and mapthe voice intocommand

Techni'ues fullydeveloped

$

"lectroencephalogram&

direct Brain-

ComputerInterface.

3o( input speed

M$"lectromyogram&

lectro myographicpotential signalsfrom the remainingvoluntary muscles

4i5cult to maintainlevel. $ood foron%o6 binary input.7atigue problem.

#$-based"lectrooculogram& eye trac)ing

Trac)ing eyemovement byrecording electric8eld generated bythe cornea-retina

potential di6erence.

7ast input speed.asy to maintainspeci8c levelIndependent fromhead orientation

Comparison of different HCI


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Structure of EOG

E"G Electro#es PlacementPosition


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System overview


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4esign 9 Building a myoelectric signal or electrodes

generated signal detector circuit.

4esign 9 4eveloping a signal ampli8er circuit (hich (illthen amplify the electrode signals to get processed bymicrocontroller.

4esign 9 4eveloping a microcontroller Circuit to Control#verall system

4eveloping an embedded program to convert theseelectrical signals into particular actual action or codes.

"on$ertin% Si%nal into Application


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E"G Electro#es

n C$ electrode is a device attached to the s)in oncertain parts of a patient:s body. It detects electrical

impulses produced in the body. The number andplacement of electrodes on the body can vary, but thefunction remains the same.

C$ electrode placed on the body is attached by a(ire to an C$ machine. The electricity that an

electrode detects is transmitted via this (ire to the


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nstrumentation Ampli&er

1. The 4;2< is an integrated, micropo(er instrumentation ampli8er thatdelivers rail-to-rail output s(ing onsingle and dual "=2.2v to >1?v&supplies.

2. The 4;2< o6ers superior @exibilityby allo(ing the user to set the gain ofthe device (ith a single externalresistor (hile conforming to the ?-lead industry-standard *inoutcon8guration.

+. (ide supply voltage range "=2.2v to>1?v& and micro po(er currentconsumption ma)e the 4;2< aperfect 8t for a (ide range ofapplications.


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Analo% to !i%ital "on$ersion


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1. /0 TM$ 1;%+2 Microcontroller

2. 1; x 2 lpha Aumeric Intelligent 3C4

+. #nboard In ystem *rogrammer *ort "I*& for easyprogramming

. Inbuilt 1; M Crystal.

D. Buer for various noti8cations;. ? channels 1E Bit 4C


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,e main ob@ective in sstem is to 'etection of electric

si%nal near ee area and usin% electrodes

Si%nal is analo% t,us ('C is used to convert t,is electric

analo% into di%ital

Wireless robotic vehicle design:Proposed sstem includes

t,e wireless robotic ve,icle w,ic, can be controlled in 4

different directions8 -ser can ,ave access to t,is ve,icle

usin% radio fre/uenc enabled circuitr t,rou%, brain

si%nals %enerated usin% ee motion

pro%rammin% for robotic ve,icle in "mbedded C sstem

usin% microcontroller

%&y use ATMega board


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'()* P" A+

*4 3#L M#40T 7T

MM#0 M33 30$ 30$

0CITC0 CIC 0IC 0IC

4C A#T *0AT IABI3T IABI3T

TIM0 IABI3T IABI3T IABI3T

*LM CAA3 A#T *0AT IABI3T IABI3T

"omparison of #ierentmicrocontroller


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Actual "ircuit !ia%ram

lectrodesInput

Instrumentationmpli8er

igh *ass7ilter

#pe-mp 3o( *ass7ilter

4C


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Actual signal detection circuit

wit& electrode


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Prototpe +ehicleWith / ecei$er


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Si%nal !etection Sstem n ts#eal State


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Signal 'etection System S&owing Rig&t

(ye Movement


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Si%nal !etection SstemSho0in% 1eft Ee Mo$ement


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signal 'etection System S&owing )pward (ye Movement


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Si%nal !etection Sho0s 0hen!o0n0ar# Mo$ement of Ee


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Operatin% sstem3

Microsoft (indo(s J* or greater #.. /ersion

!e$elopment tools3

Microsoft dot net 2E1E "7or (indo(s application& mbedded NC: "7or tmega1; *rogramming&

Har#0are3

4isposable lectrodes

lectrodes snap lead cables

ignal ampli8er circuit

/0 4evelopment Board

I* *rogrammer

B to erial interface circuit

e4uirement analsis


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,is pro@ect presents an "#$6based mouse sstem andve,icle direction ,andlin% sstem desi%n b usin%

CI8 ,e e7perimental results s,ow t,e validit of t,e

applied approac,8 In t,is sstem5 t,e user can move t,e

cursor from a random position to t,e tar%et also locate

in a random position similarl user can move prototpe

ve,icle in particular direction8

"onclusion


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S,an%6Lin >u 5Lun6'e Liao and S,ao6>ei Lu AControlling a HumanComputer InterfaceSystem With a Novel Classification Method that Uses Electrooculography SignalsB I"""

R(S(CI#S # I#*"'IC(L "$I""RI$5 D#L8 &5 #8 .5 (-$-S 213

>atc,arinan%su9sant5 C,ittap,on(e9mun9,on%paisal5 Patt,iaCambua5 ADirectional Eye

Movement Detection System forirtual !ey"oard ControllerB ,e 212 iomedical

"n%ineerin% International Conference I"""

intendo Instruments5 EEye Mario# Controlling ideo $ames %ith Eye MovementB5 (u%2128

Pereireless

etwor9in% 212)8

eferences


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Thank - ou

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human computer interfacing