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Friday, 21 May 2010

WIRELESS MESSAGING VIA MOBILE/LANDLINE

Project Descreption

The main objective of this system is to transmit message or text through ordinary Land Line Telephone/mobile from one end (source) to another end (designation). This is get achieved by the DTMF technology. It has two sections one for editing the text and to transmit the edited text and the other section consist for receiving the text message. The system works on the DTMF technology. (Dual Tone Multiple Frequency).
It involves several steps. They are
DTMF decoding/Encoding process
Ring sensing
ON/OFF hook detection
Displaying the message in LCD
The above process is get achieved by the microcontroller AT89S8252/AT89C51/52.Thus Microcontroller controls the whole system.
As the title “wireless messaging via mobile/landline phone” itself indicates that this project deals with the transfer of message from one mobile to another or one landline to another without using wire connection.

The DTMF tones sensing circuit display the message at LCD as sent by other end by means of tone transmission.

Applications: DEFENCE, FUN & ENTERTAINMENT, GAMES & SPORTS, SURVILLANCE

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