Presented By:Charbel A. Habib
Harpreet Kaur JassalHassan A.M. Muhsen
OutlineThe Project
Input unit Processing unitControl UnitOutput unit
Future WorkConclusion
The ProjectSystem Architecture
System Architecture
Input Unit
Main Unit(Microcontroller/PC)
Robot (Output Unit)
EOG Sensors(Electrodes)
Amplifier
Process Unit
Control Unit
Filtering
Segmentation
Translation
Comunicator
EOGEOG Signal
EOG: Electrooculogram the recording of the changes in voltage that occur
with the eye position.
o Electro: electricalo Oculo: eyeo Gram: recording
EOGEOG Signal
EOG: Electrooculogram spherical battery
positive terminal: the cornea negative terminal: the retina.
0.4 and 1 mV
EOGEOG Signal
EOGEOG Signal
The signals are measured using EEG disposable electrodes
Input UnitSensors
Amplifier
EOGElectrode signal:
0.4 and 1 mV
This low voltage is not strong neither usable
SOLUTION: ???
EOGAmplifier
Designing an amplifier Requirements:
Total gain of 5000 Cutoff frequency of 25Hz LPF Offset compensation
Amplifier Design
Buffer Amplifier
U1A
LM747AH
4
3
5
2
1
R1
3.3k
R23.3k
1
VCC
12V
nVCC
-12V
VCC
nVCC
V1500mV
0
3
U2A
LM747AH
4
3
5
2
1
R3
3.3k
VCC
12V
VCC
-12V
V2200mV
6
0
VCC
VCC
4
XMM1
2
5
Difference Amplifier
Amplifier Gain = -R2/R1
U3A
LM747AH4
3
5
2
1
VCC
12V
nVCC
-12V
VCC
R4
3.3k
R5
3.3kR83.3k
10
0
R6
33k
R7
33k7
nVCC8
XFG2
XSC3
A B
G
T
XSC1
A B
G
T
0
9
12
11
High Frequency Filter
4th order Butterworth FilterCut off Frequency of Filter
(f0)= 1/(2π*R*C)
R1
10k
R2
10k
R3
10kU3A
LM747AH
4
3
5
2
1
VCC
12V
nVCC
-12V
VCC
nVCC
R4
5.6k
1
R5
10k
R6
10k
R7
10kU1A
LM747AH
4
3
5
2
1
VCC
12V
VCC
-12V R8
5.6k
7VCC
VCC
XFG1
0
XSC1
A B
G
T
0
XSC2
A B
G
T
9
0
C50.47uF-POL
3
4
C10.47uF-POL
2
0
C20.47uF-POL
6
8
C30.47uF-POL
5
0
Low Pass Filter
Summer Amplifier
U1A
LM747AH4
3
5
2
1
VCC
12V
nVCC
-12V
R1
10k
R2
10k
R3
10k
R410k
R5
20K_LINKey = A
50%1
0 2
4
XFG1
XSC1
A B
G
T
5
XSC2
A B
G
T
3
0
VCC
12V
VCC
VCC
12V
VCC
0
Inverting and Non inverting Amplifier + Rectifier
Inverting Amplifier = -R2/R1 & Non Inverting Amplifier = 1+ R2/R1
XFG1
XSC1
A B
G
T
U1A
LM747AH4
3
5
2
1
VCC
12V
nVCC
-12V
R1
3.3k
R2
33k
2
0
XSC2
A B
G
T
R3
10k
0
D2
1N4001GP
6 4
U2A
LM747AH4
3
5
2
1
VCC
12V
nVCC
-12VR4
3.3k
R5
33k
0 3
D1
1N4001GP
5
0
1
XSC3
A B
G
T
R6
10k
7
0
Half Wave Rectifier
Amplifier Implementation
Amplifier Gain
Problems Unavailability of small power supply
Electrodes
Amplifier Vcc supplier
Main UnitProcess Unit
Control Unit
Processing UnitRight side movement of eyes
Left side movement of eyes
Movement of eyes during reading
Upside movement of eyes
Downward movement of eyes
Blinking movement of eyes
Signal ProcessingFiltering (Median Filter)Segmentation (Clustering)
Original Data
Filtered Data
Segmented Data
ProblemsMicrocontroller Delay
Median Filter Window Size
Control Unit
Control Unit
Translation
Comunicator
Control UnitTranslation (PWM)
Center = 128Right & Up = 185Left & Down = 70
CommunicationDirect from Microcontroller
Main Unit
Overall PictureStart
Running Mode
Read Input
Yes
Process input
Send Output
Calibrate
No(Learning Mode)
End
ProblemsCalibration
ADC Delay
Output Unit
Demo
Future WorkOn/Off Mechanism
Real Neck Implementation
Applying to Aesop3000
Conclusion
THANKSAny Questions???
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