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1. A Seminar on
ELECTRONIC EYE
Submitted By:
Soumya ranjan parida
Branch:-E.T.C
Regdno:-0501222098

2. CONTENTS
 INTRODUCTION
 WORKING PRINCIPLE
 BLOCK DIAGRAM
 CIRCUIT DIAGRAM
 COMPONENTS
 OBSERVATION&ANALYSIS
 FUTURE SCOPE
 APPLICATION
 CON CLUSION

3. Introduction
Electronic eye has much use in this electronic age.
Also known as magic eye. It can be used as an
automatic guest indicator at the door, if fixed at the
bottom of the door entrance. Once it is installed at
the door there is no need to install a call bell. It can
also be used at homes or in banks as a burglar
alarm.

4. WORKING PRINCIPLE
 principle of working mainly depends on the
LDR
 LDR is a device which has a resistance which
varies according to the amount of light falling
on its surface

5. BLOCK DIAGRAM

6. Electronic eye structure

7. CIRCUIT DIAGRAM

8. COMPONENTS
 Resistors : R1 - 270K
R2 - 12K
R3 - LDR
 Capacitor : C1 - 0.02MFD
 Semiconductors : Q1 - BC547
Q2 - BEL188
 Miscellaneous : 3V Battery
Speaker

9.  LDR-Light dependent resistor
 Transistor BC 547 - NPN type
valence bands
conduction band band
band
gap
Cadmium
Sulphide
track
 Transistor BEL 188 - PNP type

10.  If The intensity of light is more the resistance
of the LDR is less
 If The intensity of light is less the resistance of
the LDR is more
 The two transistors BC547 and BEL188
both working together as a complimentary pair
direct coupled amplifier. For oscillation of a
circuit feedback amplifier Transistor BEL188 is
collector giving of 0.2MFD of 12K resistor
starts to pre transistor BC547.

11. OBSERVATION&ANALYSIS
 Electronic eye circuit works as light intensity
indicator.
 Speaker will be activated.
 Transistor BEL-188 is used to amplify the
output signal

12.  Characteristics of BEL-188
Vceo(min) - 15v
Vcbo - 25v
Vebo - 5v
Vce - 1v
Vcesat - 0.5v

13. FUTURE SCOPE
 We can increase the range of this equipment
by using better sensor.
 We can use this as Remote Controller.

14. MERITS
 Low cost
 Easy to construct
 Portable
 Low power consumption
 Real time applications

15. DEMERITS
 It is difficult to work with this equipment if
there is no sufficient lighting conditions.
 Unnecessary disturbances may occur while
using in the Apartments

16. APPLICATIONS
 It can be used as an automatic guest indicator at the
door.
 It can also be used in banks as a burglar alarm.
 Electronic Eye is a vital component in any
electric circuit which is to be turned on and off
- for example, solar powered garden lights,
and night security lighting.

17.  An Electronic Eye can even be used in a simple
remote control circuit using the backlight of a
mobile phone to turn on a device
 Once it is installed at the door there is no need to
install a call bell.
 Only 3V DC power supply is required for operating
the circuit.

18. conclusion
Therefore we have reached the epilogue of this
project and we have worked on this project
because this provides many real time applications
So, it can be used in many security applications
Thus this Electronic Eye can detect the light
intensity by using LDR(Light Dependent Resistor