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Data transmission

 

through

 

power lines

 

 

 

Introduction:

 

In this project we will control the devices using powerline transmission medium. We will send controlling data through powerline from transmitter. On receiver  end we will control the devices.

 

Data commmuniction using power line is important project according to today’s increasing rush of power line and data lines. In this project we will transmit data using earth wire. Earthing very important  for this project. It will also help to control the the various devices with power supply circuit.    In this project we will transmit data using DTMF encoder IC  91214 . IC 91214 is frequency generators . Actually we will send particular frequency to decode it at receiver. We wll amplify the signal after DTMF technology play the key role.

In amplifiers first of all we will use voltage amplifier and then power amplifier there will be IC741 as voltage amplifier circuit. And then transistorized  power amplifier circuit. In receiver side there will be amplifiers then there will be DTMF decoder driver IC 8870. we will reamplify the signal because of the week signal detected  at receiver. Ic 8870 has pin no2, 3 as input pins .

Output of decoder will be Binary coded decimal. There will be four outputs will be input to Microcontroller IC 89c051 . output of IC will be on LCD display.

 

 

 

In this way we will transmit data . DTMF frequency lie with in voice frequency range.

 

DTMF is Dual  tone Multi frequency. Dtmf frequency wave is very equal to sine wave like

 

 

In spite of sending pulses we  will send DTMF signal. This technology is use in telephones. That’s why its very important and reliable in Data communication. Morever its frequency range lie with in voice frequency range.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DTMF DECODER.

In dtmf decoder circuit we use ic 8870 ic. IC 8870 is a dtmf decoder ic. IC 8870  converts the dual tones to corresponding binary outputs.

 

Pin Diagram

 

Features

• Full DTMF receiver

• Less than 35mW power consumption

• Industrial temperature range

• Uses quartz crystal or ceramic resonators

• Adjustable acquisition and release times

• 18-pin DIP, 18-pin DIP EIAJ, 18-pin SOIC, 20-pin

PLCC

• CM8870C

— Power down mode

— Inhibit mode

— Buffered OSC3 output (PLCC package only)

• CM8870C is fully compatible with CM8870 for 18-pin

devices by grounding pins 5 and 6

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                                           STEPS

PROJECTS SELECTION

CIRCUIT AND THEORY ARRANGEMENT

CHECKING AVAILABILITY OF COMPONENTS

TESTING CIRCUIT

PCB DESIGN

COMPONENT INSERTION AND SOLDERING

TESTING

REWORK  OR TROOUBLE SHOOTING

 

 

 

 

 

 

 

 

Applications:

 

·        Already Implemented In Bhakhra Nangal Dam.

·        DTMF signal Transmission.

·        Controlling devices .

·        Voice and Data transmission  using DTMF technology.

 

Uses:

 

·        Easy to implement

·        Reliable,

·        Low cost,

·        Components easily available in market

 

 

 

 

Bibliography

 

 

·        www.google.com

 

·        www.yahoosearch.com

 

·        http://en.wikipedia.org/wiki/Power_line_communication