EM DIAL-UP N. SHARMA - Electronics Maker

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