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Circuit of an Electronic eye based on
infra-red Transmitter and Receiver
presented here is not affected by either
sunlight or other artificial light sources.The Circuit makes use of modulated
infra-red light beam which is invisible to
the naked eye.As long as the path of infra-red modu-
lated beam between transmitter and
receiver is not interrupted by an in-
truder or object, the local area alarm
and telephone dialer section do not
operate. Once the path of the infra-red
beam gets interrupted due to any object
or intruder the alarm starts sounding
and the telephone dialer circuit gives
the alarming message through the
telephone line to the concern person
whose number has already been
stored.For proper operation, the transmitter
and receiver portions could be placed
on opposite sides of a door with IR LED
‘s of the transmitter and IR photo diode
of receiver properly aligned for maxi-
mum sensitivity.
Working Description of
Electronic Eye with Dial-UpElectronic EyeThis project is based on high sensitive IR
Transmitter & Receiver having range of
more than 15 feet. When you are away
for your house any if anyone tries to
enter the house by any means the device
shouts CHOR-CHOR-CHOR-PAKDO-
PAKDO-PAKDO Continuously more
than 40 seconds, that is enough to
chase the thief, he will run away so your
house is protected. The device not only
Electronic Eye
ELECTRONIC EYE WITH DIAL-UP
shouts but also dials out previously
stored telephone number ( which you
have stored) and gives you the message
CHOR- CHOR- CHOR. So that you
understand that something is wrong at
your house, you can immediately call up
your neighbor to look after your house.1. Keep the transmitter(TX) &
receiver(RX) aligned in a straight
position facing each other about a
distance more than 2 meter but not less
than that.2. Connect the two 1.5v cells inside
the bobbin of transmitter module
properly.3. Connect the telephone line to
telephone line input of the circuit.4. Connect the mains cord to 230v
AC of your supply & switch on the supply.5. When you switch on the supply if
the circuit initially plays any alarming
message only press the reset switch to
make the message off.6. The message will reset only after
completing the total message when you
have pressed the reset switch SW1.7. If the message is continuously
playing after the reset switch has been
pressed means that the transmitter (TX) &
receiver (RX) is not properly aligned or it
is being obstructed.8. Switch on the power supply if no
message is played first step is to store the
telephone number of the concerned
person.9. To store the telephone number
press the off hook switch SW2. Dial the
telephone number by the keypad. 10. By doing that the green LED on the
PCB will be glowing showing that the
telephone number has been dialed.11. Wait for 5 to 6 seconds after dialing
out the telephone number then take off
the hand from the off hook switch means
that your number has been stored.12. After that obstruct the beam
created between infrared receiver (RX) &
transmitter (TX) immediately after that
you hear the alarming message (chor
chor ….) through the speaker.13. At the same time it will dial out the
telephone number which has been
stored.14. You can hear the same alarming
message through telephone line for 30
seconds. The message will be stopped for 30
seconds & again after 30 seconds you
can hear the same message through
telephone line till no one is resetting the
circuit.
Electronic Eye with Dial-UpCircuit DescriptionThis electronic eye based on barrier created by Infrared Transmitter (TX MODULE) & Receiver (RX MODULE). The Infrared Receiver (RX) acts like an electronic eye. The transmitter (TX) transmits the infrared signal of 36KHZ which is received by the Receiver (RX) continuously. When this beam of 36KHZ is being obstructed the output of Infrared Receiver (RX) pulses from low to high. This output of Infrared Receiver (RX) is connected to clock input of the latch through a pull down resistor. The D input of latch (D-Flip Flop) is kept in permanently high. If the clock input pulses from low to high the output goes
Circuit Description
Infrared Transmitter (TX MODULE) & Receiver (RX
transmitter (TX)
Receiver (RX)
Infrared Receiver (RX)
S.K. Kirar
EMN. SHARMA
TESTED
100 10K150
10K
150
Circuit Diagram of Electronic Eye
high. The output of this latch (D-Flip Flop) is given to two different sections, first one is given to the clear input of IC5 556 which is having two 555 timer inside it & the second one is connected to message input of voice IC3 API8208. This voice IC3 contains the alarming message of (chor chor chor…) which keeps the local region & concern person alarmed to take the immediate action. The output of this IC3 API8208 goes to two different sections. First output is coupled to an amplifier in which we are using IC4 LM386 whose output is connected to a speaker. The second output of IC3 API8208 is coupled to voice input of telephone dialer circuit. The speaker gives the alarming message to the local area. The voice input of telephone dialer circuit gives the alarming message through, the telephone line to the concern person whose number have been stored.Now the two timers 556a & 556b are
being used to make two different timing
circuits. The first timer 556a is for 30
seconds, which is used to off hook the
telephone line (to lift the telephone hand
set). The second timer 556b is for 2
seconds which is used to dial out pre-
stored telephone number. The 30
second timer is connected to output of
IC2 latch (D-Flip Flop). The output of 30
second timer is connected to two
different circuits. The first one is an off
hook relay through a transistor (Q1),
which is connected in telephone dialer
circuit. The second output goes to 2
second timer. The output of 2 second
timer goes to dial input of telephone
dialer through transistor (Q2). The purpose of 30 second timer is to off
hook the telephone line for 30 seconds
& to give the message for 30 seconds
continuously. But if the telephone line is
off hook & no dial tone is present then it
will remain off hook for 30 seconds
without dial tone. Then again it will
remain on hook for 30 seconds after
that it remains off hook again for 30
seconds, till no one is taking immediate
action(reset). The RESET Switch (SW1) is
connected to the clear input of latch (D-
Flip Flop).
Telephone DialerCircuit Description
IC5 556 555 timer
IC3 API8208.
IC3 API8208
IC4 LM386
IC3 API8208
timers 556a & 556b
556a is for 30
seconds,
556b is for 2
seconds
IC2 latch (D-Flip Flop)
transistor (Q1),
(Q2)
RESET Switch (SW1)
Circuit Description
Resistance:
No. Value Reference Qty
1. 100W R3, R4 2
2. 150W R6, R8 2
3. 820W R10 1
4. 1KW R11 1
5. 3.9KW R14, R18 2
6. 10KW R1, R2, R5,
R7, R15, R16 6
7. 330KW R12 1
8. 470KW R13 1
9. 570KW R17 1
10. 820KW R9 1
11. 1MW (Preset)VR1, VR2 2
Total = 20
Capacitors:
No. Value Reference Qty
1. 10µF/25V C3 1
2. 100µF/25V C2, C11, C12 3
3. 220µF/25V C8 1
4. 10nF C6, C10, C13 3
5. 1000µF/25V C1 1
6. 100nF C4, C5, C7, C9 4
Total = 13
Transistors:
No. Value Reference Qty
1. 548 Q1, Q2 2
Total = 2
Diodes:
No. Value Reference Qty
1. IN4007 D1, D2, D3, D4 4
2. 1N4148 D5, D6 2
Total = 6
IC's:
No. Value Reference Qty
1. 7805 IC1 1
2. 4013 (14 Pin)IC2a 1
3. API8208 (16 Pin)IC3 1
4. 386 (8 Pin) IC4 1
5. LM556 (14 Pin) IC5a,IC5b 1
Total = 5
Components List of Electronic Eye
Circuit Diagram of Telephone Dialer
Resistance:
No. Value Reference Qty
1. 10W TR22 1
2. 22W TR9 1
3. 47W TR24 1
4. 100W TR3 1
5. 220W TR27 1
6. 330W TR30 1
7. 390W TR8 1
8. 560W TR28, TR29 2
9. 680W TR4, TR21 2
10. 820W TR10 1
11. 3.3KW TR6 1
12. 3.9KW TR2 1
13. 6.8KW TR23 1
14. 15KW TR15 1
15. 33KW TR12 1
16. 91KW TR26 1
17. 100KW TR7, TR19, TR25 3
18. 120KW TR1 1
19. 150KW TR5, TR14 2
20. 560KW TR13, TR16, TR17 3
21. 1MW TR18 1
22. 1.5MW TR11 1
Total = 29
Capacitors:
No. Value Reference Qty
1. 100µF/25V TC3, TC4, TC5 3
2. 4.7µF/100V TC6 1
3. 4.7µF/50V TC25 1
4. 47pF TC12, TC13 2
5. 100pF TC8, TC9 2
6. 1kpF TC7, TC10, TC11, TC14 4
7. 2.2kpF TC15, TC16, TC22, TC24 4
8. 3.3kpF TC20 1
9. 10nF/63V TC19 1
10. 100nF/DISC TC17, TC23 2
11. 470nF/63V TC18 1
12. 100nF/63V TC21 1
Total = 23
Transistors:
No. Value Reference Qty
1. A44 TQ2, TQ5 2
2. A92 TQ4 1
3. BD135 TQ1 1
4. BC546 TQ3 1
Total = 5
Diodes:
No. Value Reference Qty
1. IN4007 TD1, TD2, TD3, TD4 4
Components List of DialerThe telephone dialer circuit contains
three sections, Voltage dropping,
Dialing Generator, and Sound
Amplifier. Before the voltage dropping
circuit there is a polarity corrector circuit,
this section consists of four diodes TD1,
TD2, TD3, TD4 which forms the bridge
rectifier. This bridge rectifier makes the
polarity correct in any way you connect
the telephone line. Through the
telephone exchange we get a 48v DC
supply which is directly connected to this
telephone dialer. As we off hook (lift up
the telephone receiver) the circuit 48v
DC is dropped to operating voltage of
both the ICs (TIC1, TIC2). It means that
the telephone dialer works only when we
off hook. This voltage dropper circuit
mainly consists of three transistors (TQ2,
TQ4, TQ5). In this transistor TQ4 (A92)
is the PNP transistor & the other two are
the NPN transistors. After the off hook
switch through resistance TR21 to TR22
the supply voltage is connected to the
emitter of TQ4. This emitter voltage is
dropped through 100K? resistance
(TR19) to the base of TQ4. The other
transistor TQ5 (A44) is also getting the
same voltage to the collector. These two
transistors on getting the base voltage
through telephone line get switched on,
& drop the voltage across the telephone
line. This voltage dropper circuit is also
responsible for voltage regulation.
Transistor TQ3 (BC546) is called the
current limiting transistor. Due to this
voltage dropper circuit on off hook
condition the 48v DC drops to 10v DC.The dialer generating section mainly
consists of a key matrix section, dialing
generator section. The key matrix
section consists of 12 push buttons
which is on the telephone keypad. This
key matrix is connected directly to TIC1
(HT93214). As we press the key on the
telephone keypad particular rows &
columns get shorted which is sense by
the dialing generator TIC1 (HT93214).
The dialing generator is an 18 pin IC.
The sixth pin is +VCC & fifth pin is a
GND. This IC generates the DTMF tones
on pressing the particular keys on the
key matrix. Pin no. 8 of this IC is the
output pin in which an LED TLED1
(Green) is connected. Also this output is
connected to the sound amplifier
Voltage dropping,
Dialing Generator, and Sound
TD1,
TD2, TD3, TD4
48v DC
ICs (TIC1, TIC2).
(TQ2,
TQ4, TQ5) TQ4 (A92)
TR21 to TR22
TQ4.
(TR19) TQ4.
TQ5 (A44)
Transistor TQ3 (BC546)
a key matrix section, dialing
generator section.
TIC1
(HT93214).
TIC1 (HT93214).
sixth pin is +VCC & fifth pin
an LED TLED1
(Green)
Component layout for the PCB.
Actual - size, solder-side PCB layout.
thsection. 18 pin of this IC is a redial input
which is connected to the 2 second timer
of the main circuit through a transistor
(Q2). This IC can store a 30 digit
number, in a single memory. This IC
works on a clock frequency of
th18 pin redial
transistor
(Q2).
3.58MHZ.Sound amplifier section consists of an IC
TIC2 (TEA1062) which is 16 pin IC. Pin
no. 1 of this IC is +VCC and pin no. 9 is
a GND pin. Pin no. 6 & 7 is the voice
input which is connected to 560W
3.58MHZ.IC
TIC2 (TEA1062)
VCC pin no. 9
GND Pin no. 6 & 7 is the voice
input
resistance. The purpose of this IC is to
amplify the DTMF tones generated by
the dialer circuit & voice input. This IC
amplifies the signal & couples it to the
telephone line. The output of 30 second
timer of the main circuit is connected to
Components List of Dialer
2. IN4148 TD6, TD8, TD10, TD11, TD12 5
3. 3.3V TD7 1
4. 12V TD5 1
5. 27V TD9 1
6. Green TLED1 1
Total = 13
IC's:
No. Value Reference Qty
1. HT93214 (18 Pin)TIC1 1
2. TEA1062 (16 Pin) TIC2 1
Total = 2
MISC:
No. Value Reference Qty
1. - SPDT Relay R1 1
2. - Off Hook SW2 1
3. - Reset SW1 1
4. 3.58 MHZ X1 1
5. 3 X 4 Keypad 1
6. 8 W/1Watt Speaker 1
7. 95V TVR1 1
8. 12VAC/1AMP Transformer 1
9. RX-01 RX MODULE 1
10 TX-01 TXMODULE 1
Total = 10
the off hook relay of the dialer section.The whole circuit of ELECTRONIC EYE
WITH DIAL UP works on 5V DC. The
power supply circuit consists of
12V/1AMP transformer.output is
connected to IC1 7805 a 5V regulator.
The transmitter module requires 3V DC
supply. The total current consumption
of the circuit is about 600mA.
ELECTRONIC EYE
WITH DIAL UP
IC1 7805