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 todays 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. Thats why its very important and reliable in Data communication. Morever its frequency range lie with in voice frequency range.
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.
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
Power down mode
Buffered OSC3 output (PLCC package only)
CM8870C is fully compatible with CM8870 for 18-pin
devices by grounding pins 5 and 6
CIRCUIT AND THEORY ARRANGEMENT
CHECKING AVAILABILITY OF COMPONENTS
COMPONENT INSERTION AND SOLDERING
REWORK OR TROOUBLE SHOOTING
· Already Implemented In Bhakhra Nangal Dam.
· DTMF signal Transmission.
· Controlling devices .
· Voice and Data transmission using DTMF technology.
· Easy to implement
· Low cost,
· Components easily available in market