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PROJECT ON WIRELESS DATA AND VOICE COMMUNICATION THROUGH INFRARED-LED

PROJECT KIT  1500/-      /  ASSEMBLED PROJECT COST  3500/- Free Home Delivery In Delhi NCR

SYNOPSIS of the month

TITLE OF THE SYNOPSIS:-

“Conceptual designs development & demonstrations of a
WIRELESS DATA AND VOICE COMMUNICATION THROUGH INFRARED-LED”

OBJECTIVES:-

To Design a circuit of an electronic infrared communication system.
Develop new ideas to implement this circuit purposely.
To study the circuitry and different types of components & DTMF generator, DTMF decoder, op-amp and infrared-LED in the circuit.

CLICK HERE TO SEE FREE PRESENTATION OF THIS PROJECT

INTRODUCTION

For years, infrared LED has been merely a system for piping light around corners and into the inaccessible places to allow the hidden to be lighted. But now, infrared LED has evolved into a system of significantly greater importance and use. Throughout the world, it is now being used to transmit voice, television and data signals as light waves. Its advantages as compared with conventional coaxial cable or twisted wire pairs are manifold. As a result, millions of dollars are being spent to put these light wave communication systems into operation.
One of the most interesting developments in recent years in the field of telecommunication is the use of laser light to carry information over large distances. It has been proved in the past decade that light wave transmission through laser light is superior than that achieved through wires and microwave links. Typically, infrared LED has a much lower transmission loss per unit length (0.15-5db/km) and is not susceptible to electromagnetic interference. Economically also, it serves our purpose. The ever increasing cost and the lack of space available in the congested metropolitan cities asks for advent of a less costly system.
The conventional telephonic systems use copper wires, which easily get oxidized and as such require high maintenance cost. The laser light being made of glass are non-reactive and hence economical. Also, the noise pick up by the copper wire or in electrical signals is quite substantial whereas in laser light, the noise pick up is negligible.

Basic elements of a infrared LED system

Applications
(i) Applications for video transmission include high quality video Trunked from studio Transfeter, Broadcast CATV video, Video Trunking within city or between cities, Baasedand Video for closed.

BLOCKDIAGRAM

CONSTRUCTION AND WORKING

MIKE: Its converts sound signals into electrical signals.

AMPLIFIER (A): Signals from mike are amplified so that it can drive to infrared-LED.

INFRARED-LED: It carries signals.

PHOTO TRANSISTOR: The electrical signals are regained from the optical signals.

AMPLIFIER (B): Energy of signals is amplified to drive the speaker.

SPEAKER: Electrical signals which are amplified are reconverted into sound signals at the speaker.

DTMF CODER: It is generates the DTMF signal corresponding to the number entered from the keyboard.

DTMF DECODER : It is fed to DTMF decoder which gives the binary output corresponding to the signal received from the transmitter.

DECODER DRIVER : To drive the 7 segment display.

The circuit

The main part of Circuit is an amplifier.  This sound signals (even at a distance of 2 meters from the mic) are picked up by the condenser microphone and converted into electrical variation, which are amplified by the op-amp. (Operational amplifier)  IC- 741 is use in the inverting mode with a single supply using divider network of resistor the gain of IC can be set be varying the feed back through R5/6  resistance (can place a 1M variable) here the output of IC is further amplified buy the push-pull amplifier using transistor BC.548/558 pair, in this circuit are R2 is feed back resistance with R1/8 and C1/3 to connected IC-741.  The IC’s pin 2 is connect VR1 (variable resistance) through connect to O/P of T1 (transistor) also use 6volt DC. The microphone should be placed near the circuit with the shield wire to suppress tune. The output of the amplifier is taken from emitter of two transistors, with a filter C5 from speaker.  Same process continues in the second amplifier.

CIRCUIT DESCRIPTION OF SWITCH SECTION

This project was based on photo diodes and photo transistor. Photo diodes had been used as a transmitter and photo transistor as a receiver. This project had been divided in two part, First part transmitter section and second part receiver section. Slide switch selected to voice communication and data.

TRANSMISSIONSECTION :When switch key is pressed, circuit is energised. The output of The transmit IR beams modulated at same frequency 1KHz. The receiver uses infrared module. The IR- signal form the transmitter is sensed by the receiver sensor.

RECEIVER SECTION:- This section is worked as a Flip-flop (Bistable). IC-3 is decade counter, its Pin No.14 is input and Pin No. 2 output. The output of frequency detector stage is used, via a flip-flop, to switch ‘ON’ or switch ‘OFF’ a LED alternately. The receiver uses infrared modules IR-signal from the transmitter is sensed by the sensor through and its output PIN 1 goes low and switched LED. IC-3 is worked on clock pulse which receives to infrared modules at Pin No. 14. Its output at Pin No 2 throughes high.
The output of IC-2 is also used for lighting LED-1 indicating presence of signal. When no signal is available output of sensor module goes high and transistor LED is switched ‘OFF’. When another signal arrives, LED is switched ‘ON’ and through clock pulse at Pin No. 14 of IC-3. This makes the LED to switch ‘ON’ the appliance at first pulse and ‘OFF’ the appliance at its Second pulse arrived at its sensor. Transmitter circuits works satisfactorily with 6-9V DC. Battery but receiver circuits needs 6V regulated supply. The CAMD CM8870/70C provides full DTMF receiver capability by integrating both the band-split filter and digital decoder functions into a single 18-pin DIP, SOIC,or 20-pin PLCC package. The CM8870/70C is manufactured using state-of-the-art CMOS process technology for low power consumption (35mW, MAX) and precise data handling. The filter section uses a switched capacitor technique for both high and low group filters and dial tone rejection. The CM8870/70C decoder uses digital counting techniques for the detection and decoding of all 16 DTMF tone pairs into a 4-bit code. This DTMF receiver minimizes external component count by providing an on-chip differential input amplifier, clock generator, and a latched three-state interface bus. The on-chip clock generator requires only a low cost TV crystal or ceramic resonator as an external component.
Notes:
1. dBm = decibels above or below a reference power
of 1mW into a 600. load.
2. Digit sequence consists of all 16 DTMF tones.
3. Tone duration = 40ms. Tone pause = 40ms.
4. Nominal DTMF frequencies are used.
5. Both tones in the composite signal have
an equal amplitude.
6. Bandwidth limited (0 to 3KHz) Gaussian Noise.
7. The precise dial tone frequencies are
(350Hz and 440Hz) ±2%.
8. For an error rate of better than 1 in 10,000
9. Referenced to lowest level frequency component
in DTMF signal.
10. Minimum signal acceptance level is measured with
specified maximum frequency deviation.
11. Input pins defined as IN+, IN–, and TOE.
12. External voltage source used to bias VREF.
13. This parameter also applies to a third tone injected onto
the power supply.
14. Referenced to Figure 1. Input DTMF tone level
at –28dBm.
COMPONENTS USED

RESISTANCE:
R1,            150W
R2,R11,R12    100kW
R3, R7        10KW
R4, R8        4.7kW
R5,R6,R9,R10  15KW
R13                    220K W
R14                    1KW
R15-R22           150W
VR-1,VR-2    1MW Variable Resistance

CAPACITOR:
C1,C2,C4,C5    0.1 mfd (104 pf)
C3            220 mfd
MIKE            Condensor Microphone

SEMICONDUCTOR:
IC1-               UM91215B (DTMF CODER)
IC2, IC-3        741 (OP AMP)
IC-4                    CM8870 (DTMF DECODER)
IC-5            74LS47 (DECODER)
T1,T3            NPN BC548
T2,T4            PNP BC558
LED            Light Emitting Diode
Pt.            Photo Transistor

MISCELLANEOUS:
IC Base            8 Pin (2pcs.)
Speaker            8 ohms
Optical Fibre        General purpose
PCB            General purpose
Slide Switch               DPDT
Battery            6 volt DC

CIRCUIT DAIGRAM

RECEIVER

AUTOMATION SECTION

BLOCKDIAGRAM

CONSTRUCTION AND WORKING

IR-LED: It carries signals and converted into optical signals.

PHOTO TRANSISTOR: The electrical signals are regained from the optical signals.

DTMF CODER: It is generates the DTMF signal corresponding to the number entered from the keyboard.

DTMF RECEIVER/DECODER : It is fed to DTMF decoder which gives the binary output corresponding to the signal received from the transmitter.

DEMULTIPLEXER/ 4-16 LINE DECODER:  It takes the 4 line BCD input and selects respective output one among the 16 output lines. It is active low output and drives to relay.

RELAY DRIVER : Its section controls the relay. It has a Not Gate and four NPN transistors. NPN transistor is drive to relay which works as a switching. Relay controls the AC devices.

WORKING OF AUTOMATION CONTROL SECTION:
Signal Decoding Unit:
This is the main unit of this system. This unit consists of a DTMF to BCD decoder IC MT 8870, 4 to 16 line decoder IC 74154 and hex inverter gate IC 4049. The working of all the above IC’s are mentioned here before.
The DTMF to BCD decoder IC MT8870 takes a valid tone signal from the IR transmitter section. Then the tone signal is converted in to 4 bit BCD number output obtained at pins from 11 to 14. This output is fed to the 4-16 line decoder IC74154. This IC takes the BCD number and decodes. According to that BCD number it selects the active low output line from 1 to 16 which is decimal equivalent of the BCD number present at its input pins. Since the low output of this IC the output is inverted to get logic high output. This inversion is carried out by hex inverter IC 4049- built on TTL logic. This IC inverts the data on its input terminal and gives inverted output.
3. Device switching unit:
This unit consists of a tri state buffer and a D flip flop. After making confirmation of current status of the device to alter the status of that device, you have to change the mode of the tri state buffer by making the control input high. This is done by pressing the ‘#’ key. When this key is pressed the output of the 4-16 line decoder goes low          The output of tri state buffer is latched by using a D flip-flop. Here this D flip flop is used in the toggle mode. For each positive going edge of the clock pulse will trigger the flip-flop.
After a period of 5 seconds the output of the IC 6 goes low and puts the tri state buffer in the high impedance state. Therefore to change the status of any other device is to be done after the output of IC 6 goes low, again ‘#’ key is pressed to make the tri state buffer act as input –output state and the respective code of the device is pressed.
4. Power supply unit:
For the proper working of this local control section except the local telephone set it needs a permanent back up which gives a 5V back up continuously. This is achieved by using a 5V regulated power supply from a voltage regulated IC 7805. This 5V source is connected to all ICs and relays. This IC gets a backup from a 9V battery.
5. Relay driver circuit:
To carry out the switching of any devices  we commonly use the relays. Since the output of the D flip flop is normally +5V or it is the voltage of logic high state. So we cannot use this output to run the device or appliances. Therefore here we use relays, which can handle a high voltage of 230V or more, and a high current in the rate of 10Amps to energize the electromagnetic coil of the relays +5V is sufficient. Here we use the transistors to energize the relay coil. The output of the D flip-flop is applied to the base of the transistor T2 – T5 via a resister. When the base voltage of the transistor is above 0.7V the emitter-base (EB) junction of the transistor forward biased as a result transistor goes to saturation region it is nothing but the switching ON the transistor. This intern switches on the relay. By this the devices is switches ON. When the output of D flip-flop goes low the base voltage drops below 0.7V as a result the robotic devices also switches OFF.
CIRCUIT DESCRIPTION:
This system is divided into two sections, 1: Remote Section 2: automation Control Section.
REMOTE SECTION:
This unit consists of IR transmitter section, which is present in the remote place. The figure (E) shows the circuit diagram of the DTMF encoder, which resembles the DTMF transmitter section. It uses DTMF encoder integrated circuit, Chip UM 91214B. This IC produces DTMF signals. It contains four row frequencies & three column frequencies. The pins of IC 91214 B from 12 to 14 produces high frequency column group and pins from 15 to 18 produces the low frequency row group. By pressing any key in the keyboard corresponding DTMF signal is available in its output pin at pin no.7. For producing the appropriate signals it is necessary that a crystal oscillator of 3.58MHz is connected across its pins 3 & 4 so that it makes a part of its internal oscillator.

Figure (E). Circuit diagram of the DTMF encoder

This encoder IC requires a voltage of 3V. For that IC is wired around 4.5V battery. And 3V backup Vcc for this IC is supplied by using 3.2v zener diode.
The row and column frequency of this IC is as on the fig. “B”. By pressing the number 5 in the key pad the output tone is produced which is the resultant of addition of two frequencies, at pin no. 13 & pin no.16 of the IC and respective tone which represents number ‘5’ in key pad is produced at pin no.7 of the IC. This signal is sent to the DTMF transmitter section through IR-LED.
ROBOTIC ARM CONTROL SECTION:
This is a control unit through which you can control your devices. This contains one DTMF transmitter section  and a devices Control Section. The devices to be controlled must be connected to phototransistor through control unit. Control unit is kept with a sufficient backup.
devices control Section consists of a DTMF decoder, 4-16 line decoder/demultiplexer, D-flip-flops, and relay driver circuits. Before going into detail of the circuit, we will take a brief description about integrated circuits used in local control section.
MT 8870 DTMF decoder:
IC MT8870/KT3170 serves as DTMF. This IC takes DTMF signal coming via telephone line and converts that signal into respective BCD number. It uses same oscillator frequency used in the remote section so same crystal oscillator with frequency of 3.85M Hz is used in this IC.
Working of IC MT8870:
The MT-8870 is a full DTMF Receiver that integrates both band split filter and decoder functions into a single 18-pin DIP. Its filter section uses switched capacitor technology for both the high and low group filters and for dial tone rejection. Its decoder uses digital counting techniques to detect and decode all 16 DTMF tone pairs into a 4-bit code. External component count is minimized by provision of an on-chip differential input amplifier, clock generator, and latched tri-state interface bus. Minimal external components required include a low-cost 3.579545 MHz crystal, a timing resistor, and a timing capacitor. The MT-8870-02 can also inhibit the decoding of fourth column digits.
MT-8870 operating functions include a band split filter that  separates the high and low tones of the received pair, and a digital decoder that verifies both the frequency and duration of the received tones before passing the resulting 4-bit code to the output bus.
The low and high group tones are separated by applying the dual-tone signal to the inputs of two 6th order switched capacitor band pass filters with bandwidths that correspond to the bands enclosing the low and high group tones.

Figure (F).Block diagram of IC MT8870

The filter also incorporates notches at 350 and 440 Hz, providing excellent dial tone rejection. Each filter output is followed by a single-order switched capacitor section that smoothes the signals prior to limiting. Signal limiting is performed by high gain comparators provided with by stresses to prevent detection of unwanted low-level signals and noise. The MT-8870 decoder uses a digital counting technique to determine the frequencies of the limited tones and to verify that they correspond to standard DTMF frequencies. When the detector recognizes the simultaneous presence of two valid tones (known as signal condition), it raises the Early Steering flag (ESt). Any subsequent loss of signal condition will cause ESt to fall. Before a decoded tone pair is registered, the receiver checks for valid signal duration (referred to as character- recognition-condition). This check is performed by an external RC time constant driven by ESt. A short delay to allow the output latch to settle, the delayed steering output flag (StD) goes high, signaling that a received tone pair has been registered. The contents of the output latch are made available on the 4-bit output bus by raising the three state control input (OE) to logic high. Inhibit mode is enabled by a logic high input to pin 5 (INH). It inhibits the detection of 1633 Hz.
The output code will remain the same as the previous detected code. On the M- 8870 models, this pin is tied to ground (logic low).
The input arrangement of the MT-8870 provides a differential input operational amplifier as well as a bias source (VREF) to bias the inputs at mid-rail. Provision is made for connection of a feedback resistor to the op-amp output (GS) for gain adjustment.
The internal clock circuit is completed with the addition of a standard 3.579545 MHz crystal.
The input arrangement of the MT-8870 provides a differential input operational amplifier as well as a bias source (VREF) to bias the inputs at mid-rail. Provision is made for connection of a feedback resistor to the op-amp output (GS) for gain adjustment.
The internal clock circuit is completed with the addition of a standard 3.579545 MHz crystal.

74154  4-16 line decoder/demultiplexer:
IC 74154 is a 4-16 line decoder, it takes the 4 line BCD input and selects respective output one among the 16 output lines. It is active low output IC so when any output line is selected it is indicated by active low signal, rest of the output lines will remain active high. This 4-line-to-16-line decoder utilizes TTL circuitry to decode four binary-coded inputs into one of sixteen mutually exclusive outputs when both the strobe inputs, G1 and G2, are low. The demultiplexing function is performed by using the 4 input lines to address the output line, passing data from one of the strobe inputs with the other strobe input low. When either strobe input is high, all outputs are high. These demultiplexer are ideally suited for implementing high-performance memory decoders.

Figure G. IC 74154 4-16 line decoder
All inputs are buffered and input clamping diodes are provided to minimize transmission-line effects and thereby simplify system design.
TRUTH TABLE:

IC 4013 D-flip-flop:
IC 4013 is a conventional D-flip-flop IC. This IC consists of two D flip-flops. These flip-flops are used to latch the data that present at its input terminal. Each flip-flop has one data, one clock, one clear, one preset input terminals.

(Above figure shows a single D-flip-flop)

Relay driver circuit:
To carry out the switching of devices we commonly use the relays. Since the output of the D flip flop is normally +5V or it is the voltage of logic high state. So we cannot use this output to run the device or appliances. Therefore here we use relays, which can handle a high voltage of 230V or more, and a high current in the rate of 10Amps to energize the electromagnetic coil of the relays +5V is sufficient. Here we use the transistors to energize the relay coil. The output of the D flip-flop is applied to the base of the transistor T2 – T5 via a resister. When the base voltage of the transistor is above 0.7V the emitter-base (EB) junction of the transistor forward biased as a result transistor goes to saturation region it is nothing but the switching ON the transistor. This intern switches on the relay. By this the device is switches ON. When the output of D flip-flop goes low the base voltage drops below 0.7V as a result the device also switches OFF.
Power supply unit:
NEED OF POWER SUPPLY:-
Perhaps all of you are aware that a power supply is a primary requirement for the test bench of a home experimenter’s mini lab. A battery eliminator can eliminate or replace the batteries of solid-state electronic equipment and 220V A.C. mains instead of the batteries or dry cells thus can operate the equipment. Nowadays, the sued of commercial battery eliminator or power supply unit have become increasingly popular as power source for household appliances like transceiver, record player, clock etc.
Summary of power supply circuit features:-
Brief description of operation: gives out well regulated +8V output, output current capability of 500mA.
Circuit protection: Built –in overheating protection shuts down output when regulator IC gets too hot.
Circuit complexity: simple and easy to build.
Circuit performance: Stable +8V output voltage, reliable Operation.
Availability of components: Easy to get, uses only common basic components.
Design testing: Based on datasheet example circuit, I have used this circuit successfully as part of other electronics projects.
Applications: part of electronics devices, small laboratory power supply.
Power supply voltage: unregulated 8-18V-power supply.
Power supply     current: needed output current 500 mA.

Components cost: Few rupees for the electronic components plus the cost of input transformer.

Pin Diagram of 7808 Regulator IC
Pin 1: Unregulated voltage input
Pin 2: Ground
Pin3: Regulated voltage output

Component list

7808 regulator IC
2. 0-12 transformer
3. 1000uf and 100uf. Capacitor, at least 25V voltage rating.
DESCRITION OF POWER SUPPLY

This circuit is a small + 8 volts power supply. Which is useful when experimenting with digital electronics.  Small inexpensive battery with variable output voltage are available, but usually their voltage regulation is very poor, which makes them not very usable for digital circuit experimenter unless a better regulation can be achieved in some way. The following circuit is the answer to the problem.
This circuit can give +8V output at about 500mA current. The circuit has overload and terminal protection.

CIRCUIT DIAGRAM OF POWER SUPPLY
The above circuit utilizes the voltage regulator IC 7808 and 7805 for the constant power supply. The capacitors must have enough high voltage rating to safely handle the input voltage feed to circuit. The circuit is very easy to build for example into a piece of Zero board.
For the proper working of this local control section except the mobile phone  or local telephone set it needs a permanent back up which gives a 8V back up continuously. This is achieved by using a 8V regulated power supply from a voltage regulated IC 7808. This 5V source is connected to all ICs and relays. This IC gets a backup from a 9V battery.

Fig J. Circuit Diagram of Local Control Section.
USED COMPONENTS

SEMICONDUCTORS
(1) IC-1 ………  7808
(2) IC-2…………. CM8870P
(3) IC-3…………. 74154
(4) IC-5-6………CD 4013
(5) IC-4……….. 4049
(6) IC7 ………… UM 91214B
(7) D1-D2 ………….IN 4007
(8) D3…………… 3V Zener
(9) LED ……………. Light Eammiting Diode
(10) T1-T6…………..(NPN) 368
(11) Crystal ………… 3.57 Mhz.
(12) Photodiode
(13) Phototransistor

RESISTOR
(1) R1……….330K OHm.
(2) R2……….. 100K OHm.
(3) R3,R4,R7 ………. 10K OHm.
(4) R5,R6, ………. 1K OHm.
(5) R8-R12…. 100 OHm.

CAPACITOR
(1) C1…………. 1000MFD.
(2) C2,C3…………. 0.1 MFD.

MISCELLANEOUS
(1) RELAY ………………. 6V \100 0Hm.
(2) TRANSFORMER…… 0-9 (Step down)

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September 15, 2008 - Posted by | buyproject, project ideas, Uncategorized | ,

132 Comments »

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  3. please get the block diagram displayed… and thanks for putting up such a nice show…
    best of luck

    Comment by ghaznavi | September 27, 2008

  4. […] PROJECT ON WIRELESS DATA AND VOICE COMMUNICATION THROUGH INFRARED-LED The output of IC-2 is also used for lighting LED-1 indicating presence of signal. When no signal is available output of sensor module goes high and transistor LED is switched ‘OFF’. When another signal arrives, LED is switched ‘ON’ and …Indian freshers world %26quot;INDIANENGINEER%26quot; – https://indianengineer.wordpress.com/ […]

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  5. […] PROJECT ON WIRELESS DATA AND VOICE COMMUNICATION THROUGH INFRARED-LED The output of IC-2 is also used for lighting LED-1 indicating presence of signal. When no signal is available output of sensor module goes high and transistor LED is switched ‘OFF’. When another signal arrives, LED is switched ‘ON’ and … […]

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  6. sir please sendme circuit&block diagrms

    Comment by sunil | October 16, 2008

  7. sir we want the range upto which communication can be take place

    Comment by Kunal Damodarrao Rangari | November 6, 2008

  8. please intimate us the cost of this project

    Comment by avinash | January 6, 2009

  9. sir please send me circuit and blockdiagrams and appllications

    Comment by swapna | January 9, 2009

  10. sir please send me circuit and blockdiagrams and applications

    Comment by swapna | January 9, 2009

  11. hiu…icant get the circuit diagram of this project……and also from the cjb.net

    Comment by suresh | January 16, 2009

  12. please give me the wireless motor controll circuit

    Comment by gurupat | January 21, 2009

  13. i need all the important document like circuit,block diagram for my project

    Comment by DeepakSubba | January 24, 2009

  14. can u plz display da block diagram?as i want to use it as ma projects

    Comment by sudipa | February 6, 2009

  15. i gone through the project on wireless and voice communication….but it difficult to implement practically please give me tips on it…….

    Comment by tarique anwar | February 6, 2009

  16. sir send me circuit block diagram and an other option used in place of infrared

    Comment by varun dhiman | February 6, 2009

  17. sir i want block diagram and circuits

    Comment by kaarthik raja | February 7, 2009

  18. the project is nice .send me the block & circuit diagram

    Comment by saravanan | February 8, 2009

  19. sir please send me circuit and blockdiagrams and applications

    Comment by anshu | February 9, 2009

  20. sir,very nice project.

    but i need the circuit diagrean and block diagram to help me in my
    project.

    i wil be thankful to you.

    Comment by ayesha | February 11, 2009

  21. I thank u! show design procedures and circuit diagram?

    Comment by G/hawariat | February 16, 2009

  22. respected sir ,
    your project is super ,plese can you dis play the circuit diadram.

    Comment by jeevan | February 25, 2009

  23. sir,
    this is a very nice comm. related project.
    plz send me the ckt & block diagrams..

    Comment by monalisa | February 28, 2009

  24. sir, i need block diagrams and circuits

    Comment by susmitha | March 7, 2009

  25. hi, sr. can you please send to me the shematics and block diagrams. Thanks

    Comment by victor | March 10, 2009

  26. Sir,
    please send me abstract on this project.

    Comment by salauddin | March 23, 2009

  27. i want job searchh project

    Comment by raj | March 28, 2009

  28. project on cell phone based land rover

    Comment by pulkit | March 29, 2009

  29. please send me the circuit diagram

    Comment by Abdullah | April 2, 2009

  30. Very interesting.Please send me the circuit diagram

    Comment by syam prateesh | April 2, 2009

  31. I am an engineering student. I need to make a project so i want to made the laser communication link project.
    please send block diagram and circuit diagram also.

    Comment by imram beg | April 2, 2009

  32. 42. AN INTELLIGENT AMBULANCE CAR WHICH CONTROL TO TRAFFIC LIGHT
    sir/madam can u send project report on this topic plzzzzzz

    Comment by chethan | April 6, 2009

  33. can u give circuit diagram of wireless communication

    Comment by vinay | April 13, 2009

  34. hi, sr. can you please send to me the schematics and block diagrams. Thanks

    Comment by Victor | April 15, 2009

  35. kindly send me circuit diagram
    abdullahextremest@gmail.com

    Comment by abdullah | April 22, 2009

  36. I am an student. I need to make a project so i want to made the laser communication link project.
    please send me block diagram and circuit diagram als.

    Comment by Anis Esper | April 27, 2009

  37. sir, pleaz-pieaz seand the biock diagram of laser communication link project,and circuit diagram also

    Comment by imram beg | May 8, 2009

  38. pls i need the block diagram

    Comment by olaraph | May 14, 2009

  39. hello sir..it’s me DEV from nepal.. & doing electronic engineering final semester…
    sir…can i get circiut diagram of this project once..i am doing struggle for good & efficent project..plz
    sir if possible send me on my mail id
    ncit_lubhu@hotmailo.com

    thanking you
    & ur regards
    DEV (Nepal)

    Comment by DEV | June 7, 2009

  40. hello sir..this project was great can i get circuit of this project plz sir…

    Comment by devendra | June 8, 2009

  41. the project is nice .send me the block & circuit diagram

    Comment by rajiv | June 17, 2009

  42. also display thr circuit diagram plz

    Comment by Dinesh | June 19, 2009

  43. hi this is mahesh.ur blog is excellent.i need the circuit diagram of proiject for doing this.can u pls rply me …….i have to do the project immediately…………………

    Comment by mahesh | June 29, 2009

  44. Hey it seems 2 b very interesting…can u plz send me the ckt diag, block diag & estimated cost. my email add is shanx2cool@yahoo.co.in

    Comment by sashank | July 2, 2009

  45. plz snd me all details abt project like ckt & block dgrm etc soon as possible….

    Comment by aman | July 3, 2009

  46. I also need the circuit diagram,
    Thanks alot

    Comment by amina | July 10, 2009

  47. hi

    Comment by vishal | July 17, 2009

  48. sir
    please will you send me the block diagram of transmitter and receiver
    of infrared led communication?
    Thank you

    Comment by Rohan A | July 20, 2009

  49. sir
    please will you also send the circuit diagram of the infrared led communication?
    Thank you

    Comment by Rohan A | July 20, 2009

  50. hi sir,
    i like this project.
    pls send me ckt diagram & description .

    Comment by jigar a soni | July 23, 2009

  51. sir , please i require the circuit diagrams of this project please send it

    Comment by hardik | July 23, 2009

  52. sir plz send the block diagram of the circuit

    Comment by asif baig | July 24, 2009

  53. HI DFHSDKCS ASKCDHSDCB SD DFHYASD IC SDW+684

    Comment by dyamanna | July 25, 2009

  54. 9I889P

    Comment by dyamanna | July 25, 2009

  55. pls provide me the circuit diagram and block diagram

    Comment by R.N.KOKILA | July 26, 2009

  56. sir pls send ckt diagram of this project .
    i like this project.also give other information related to this project.

    please reply.

    Comment by jigar a soni | July 26, 2009

  57. plz send me the block & ckt diagrams

    Comment by dilip kumar | July 28, 2009

  58. sir,
    will u kindlygrantme to seeurblock diagram coz .. i am interested on this project

    Comment by rakesh | July 31, 2009

  59. pls sir send me the circuit diagram of this project….it is really intresting subject. thank you for the post.
    pls send me the circuit diagram as soon as possible.

    Comment by anony. | August 1, 2009

  60. can you send me the circuit diagram &block diagram of wireless data &voice detection by led?

    Comment by Akshada | August 1, 2009

  61. please send me the block diagram and circuit diagrams, pcb layout

    Comment by tejaswi | August 10, 2009

  62. please send me the respective circuit diagrams,block diagrams,pin diagrams etc..
    plaease reply fast.

    Comment by Chandran | August 12, 2009

  63. Hi sir, I saw the project.It is very intersting project & I want to implement. So please send me the respective circuit diagrams,block diagrams,pin diagrams etc..
    plaease reply me fast.
    Iam waiting for your reply

    Comment by Chandran | August 12, 2009

  64. hi sir/madam, i went trhu tis page and gathered few ideas about tis project.am studying in narasu’s sarathy institute of tecnoloy and am frm tamilnad and am a 2nd year student not yet entered into tis paper.but i hav learnt someting new frm ur project.

    CAN U PLZZZ HELP ME TO KNW ABOUT RFID AND ALL INFORMATIONS ABOUT RFID PLLLZZZZZZ PLZ CONTACT ME : nethrapappu@gmail.com

    Comment by lakshmi | August 19, 2009

  65. i want to make a project on optical fiber based communication system please give me some clue on my email id

    Comment by kundan | August 20, 2009

  66. my id is http://www.kundankr2005@rediffmail.com give me an idea or something for project on optical fiber based voice and data transmisson my contact no is 09905095217

    Comment by kundan | August 20, 2009

  67. i m interested in this project can u send me the circuit diagram
    it is really good

    Comment by Anil Choudhary | August 21, 2009

  68. circuit diagram of voice transmission

    Comment by murugan | August 24, 2009

  69. Hello sir,
    I am doing B.tech final year in Electronics and Communication.I am working on the project of wireless communication through infrared LED and for that i need the circuit diagram.please send me the circuit diagram on my mail- id if possible . i will be very thankful to you.

    Comment by TANUJ YADAV | August 26, 2009

  70. plz give me block diagram and circuit with working details… its great project sir..

    Comment by san | August 27, 2009

  71. A good project to work upon……
    plz send d circuit diagram…….

    Comment by preksha | August 27, 2009

  72. sir,please send me in the circuit design,layout and the pin cofiguration related with PROJECT ON WIRELESS DATA AND VOICE COMMUNICATION THROUGH INFRARED-LED.
    thank u.

    Comment by SIddharth Singh | August 30, 2009

  73. sir could you please send the complete details of this project .i want for my major project.

    Comment by niranjan | August 30, 2009

  74. hi sir i have visited your projects recently ..pls sent a circuit diagram for this projects sir…

    Comment by saravana k.j. | August 30, 2009

  75. sir please send me ckt diagram & block diagram and application

    Comment by nitant | August 30, 2009

  76. sir, i am a final year student of B.I.T.M santaniketan,W.B.i want to do this project in my final year.so pls send the details of this project& ckt diagram.

    thank you

    Comment by sangit raj chandra | September 4, 2009

  77. sir, can you please send further details along with the circuit diagrams..

    Comment by sushma | September 4, 2009

  78. sir ,
    I am doing B.tech 3rd year in Electronics and Communication.I am working on the project of wireless communication.please send me the circuit diagram on my mail- id if possible . i will be very thankful to you.

    Comment by ujjwal prakash | September 7, 2009

  79. this is a very good site for project.please send me a circuit diagram

    Comment by manoj kumar | September 9, 2009

  80. please send me a circuit diagram for project on wireless data and voice communication through infrared

    Comment by manoj kumar | September 9, 2009

  81. wonderfull project………….
    sir i m B.Tech (E.C.E.)student.i want to make this project in my final year . plz snd me d ckt. n blk dia. of this project.

    Comment by neeraj kumari | September 10, 2009

  82. hey if any body reading this thn please mail me the circuit and block diagrams on jatin8patin@yahoo.co.in

    thanx
    god bless you

    Comment by jatin | September 12, 2009

  83. nice project
    i am interested in it so pls help me by sending me the project details such as price and block diagram its urgent

    Comment by shahul | September 14, 2009

  84. hello sir…
    I am a final year student and wanna do this project..
    so plzzz send me circuit and block diagram of this project..
    my id is-prathamluv4u@yahoo.com

    Comment by pratham verma | September 16, 2009

  85. Sir I need to do a project so please send me the circuit diagram of this project on my email id: nikhilagarwal2007@gmail.com

    I would be highly obliged to you for your concerns in this matter.
    Thanx

    Comment by Nikhil Agarwal | September 16, 2009

  86. Sir
    I am a student. I want to make Remote(IR) control switch bord.
    Need 3 switch and one fan regulater. Pls give me total circuit pls

    Comment by PRASUN MAITY | September 16, 2009

  87. sir,i saw the project & i found it nice & request u to show block dia.

    Comment by bimal | September 19, 2009

  88. Sir I need to do a project so please send me the circuit diagram of this project on my email id: udayachaithanya@gmail.com

    I would be highly obliged to you for your concerns in this matter.
    Thanks

    Comment by chaithanya | September 24, 2009

  89. sir please send ckt diagram of this project .
    i like this project.also give other information related to this project.

    please reply to my mail id “meetaravindc@gmail.com”.

    Comment by Aravind | September 29, 2009

  90. pl do let me know the cost of this project

    Comment by pankaj | October 4, 2009

  91. sir can u give me the price of this data and voice project

    Comment by Ranjana | October 6, 2009

  92. Sir, please send me the circuit diagram and block diagram.
    to my e-mail id

    Comment by PAVAN HK | October 16, 2009

  93. plz send me the block diagram and application of it together with more info abt it thanks

    Comment by Isaac Okafor | November 2, 2009

  94. sir please send ckt diagram and blk diagram of this project .
    also give other information related to this project. send to my mail id snowboy3k@yahoo.com

    Comment by Isaac Okafor | November 2, 2009

  95. nice project
    i am interested in it so pls help me by sending me the project details such as price and block diagram its urgent

    Comment by isaac | November 7, 2009

  96. Понравилось. А для графического наполнения Вы материал где берете? Меня вот всегда интересовало, как можно научиться выкапывать на файловых обменниках настолько суперовский материал… По поиску океан всего отображается, а чтоб отыскать хоть что-то стоящее – так это аж нуна пол дня, а то и больше потерять…. Или это Вы из перональной коллекции взяли?

    Comment by FoelveEleva | November 10, 2009

  97. please sir…..
    give me circuit digam @ block diagram

    Comment by mudit gupta | November 12, 2009

  98. helo..hv anyone hv the circuit diagram to this project..i really need to do it plz help guys…

    Comment by isaac | November 17, 2009

  99. pls send to my mail if any hv the circuit duagram

    Comment by isaac | November 17, 2009

  100. sir i need the circuit and block Diagram

    Comment by pawan | November 23, 2009

  101. sir,your site is simply supper i want circut and block diagram for PROJECT ON WIRELESS DATA AND VOICE COMMUNICATION THROUGH INFRARED-LED please send as early as posible

    Comment by susmitha | November 30, 2009

  102. plz send me block diagram of this project i need it soon.
    plz send me as qcick as possible

    Comment by Dip | December 3, 2009

  103. haiii, me suhair . u r projectis super.. am an engineering student in kerala.. i wana a friend ship with u. my mobile no :

    Comment by suhair | December 17, 2009

  104. pl sent to me a block digram

    Comment by mahesh | January 8, 2010

  105. please provide circuit diagrams,applications,total cost of the project

    Comment by saranya | January 12, 2010

  106. please send as early as possible

    Comment by saranya | January 12, 2010

  107. I real appreciate your works..congratulations!!!!!!!!!
    Now please can you help me to find an Infrared LED which has the same frequency (can match) with a photo transistor Radio shack 276-130..The code of that IR LED.

    Comment by Juma Wanse | January 12, 2010

  108. can i get the circuit diagram and an idea about the cost of the project

    Comment by indu | January 13, 2010

  109. respected sir,
    I found the project interesting and wanted the related circuit diagrams and block diagrams so that it would be easier to understand and analyse the working.

    Comment by divya | February 1, 2010

  110. specify its application

    Comment by saba | February 13, 2010

  111. A humble request to a humble man….
    Plz send me the block diagrams and the detailed circuit diagram as soon as possible.I need it urgently.Your job’s really commendable.

    Comment by abhishek | February 17, 2010

  112. It is one big step in the high tech of India. Bravo Indian engineers.

    Comment by solomon | February 20, 2010

  113. please send block diagram and circuit diagram

    Comment by gayathri | February 23, 2010

  114. this is very nice project, i want pcb layout of this project,so plz sir send me pcb layout of this project

    Comment by sikander | March 26, 2010

  115. sir please can u send me the circuit diagram for the project wireless data and voice communication through infrared led.
    i am tring to make a major project on it.

    thank you!!!

    Comment by Abhishek | March 26, 2010

  116. sir please send me the circuit details and other formalities required for this project……

    Comment by rahul | April 23, 2010

  117. sir we are doing wireless industial pollution and detection system project so give details abt -Co2 Sensor, Comparator, Indicators & digital control ,Encoder , Transmitter 433MHz,Decoder ,Rx 433MHz, Voltage conditioner pleasesend to my gmail id as early as possible

    Comment by sumangala | November 22, 2010

  118. sir please can u send me the circuit diagram detail for the project wireless data and voice communication through infrared led.
    i am tring to make a final year major project with possible enhancement on it.

    Comment by deepak | March 9, 2011

  119. sir iwant circuit diagram please send me mail to my email

    Comment by bhaskar | May 24, 2011

  120. can u send me the circuit diagram with complete functionality? plz………….i need today.

    Comment by naveen saini | September 6, 2011

  121. pls send me ckt diagram to jc.chait@gmail.com

    Comment by chaitanya | January 15, 2012

  122. awesome project…:):)
    Sir i m working on it…
    n i need ur help…
    i want PROJECT REPORT & BLOCK DIAGRAM of the above concerned topic..:):)

    plz hlp me …:):)

    i would b highly thankful to u…:):)

    Comment by MOHIT | March 3, 2012

  123. its good ,can u send me the circuit diagram of that project
    please

    Comment by dinesh | March 19, 2012

  124. hey please send me the circuit and block diagram ASAP at

    Comment by Nidhi | April 2, 2012

  125. phone number mentioned in ppt download is switched off….how to downlad or order ppt plzinform through mail

    Comment by mallika | September 17, 2012

  126. send me circuit diagram

    Comment by ashok | November 9, 2012

  127. Sir, please send me the project report & circuit diagram

    Comment by Eswar.M | January 21, 2013

  128. “PROJECT ON WIRELESS DATA AND VOICE COMMUNICATION THROUGH INFRARED-LED IndianEngineer” was in fact a extremely pleasant
    posting, . I hope you keep authoring and I’ll try to keep on reading through! Thank you -Kristi

    Comment by http://tinyurl.com/optishea27187 | February 6, 2013

  129. sir,the ckt diagram in your project file is really work well or in there some modification needed?

    Comment by shrikant | March 28, 2013

  130. CAN YOU send me project kit ,in PUNE (MAHARASHTRA )

    Comment by Dnyan AMKAR | April 12, 2013

  131. An outstanding share! I’ve just forwarded this onto a coworker who had been conducting a little research on this. And he in fact ordered me dinner due to the fact that I discovered it for him… lol. So let me reword this…. Thank YOU for the meal!! But yeah, thanx for spending time to talk about this topic here on your site.

    Comment by car battery manufacturers | June 28, 2013

  132. sir plesa sand’ WIRELESS DATA AND VOICE COMMUNICATION THROUGH INFRARED-LED’ circuir diagram

    Comment by shivanand dwivedi | February 11, 2015


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