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DTMF BASED REMOTE CONTOL SYSTEM

DTMF BASED REMOTE CONTOL SYSTEM . SUBMITTED BY :- Sayyam Gadhok UE105091 ECE B-II. DRAWBACKS OF RF CIRCUITS:- Limited working range Limited frequency range L imited control . Use of a mobile phone for remote control can overcome these limitations. ADVANTAGES OF MOBILE CONTROL:-

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DTMF BASED REMOTE CONTOL SYSTEM

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  1. DTMF BASED REMOTE CONTOL SYSTEM SUBMITTED BY :- SayyamGadhok UE105091 ECE B-II

  2. DRAWBACKS OF RF CIRCUITS:- • Limited working range • Limited frequency range • Limited control. • Use of a mobile phone for remote control can overcome these limitations. • ADVANTAGES OF MOBILE CONTROL:- • Robust control • Working range as large as the coverage area of the service provider • No interference with other controllers • Up to twelve controls.

  3. DTMF • This DTMF (Dual Tone Multi Frequency) decoder circuit identifies the dial tone from the telephone line and decodes the key pressed on the remote telephone • For the detection of DTMFsignaling, we are using the IC MT8870DEwhich is a touch tone decoder IC. It decodes the input DTMF to 4 digital outputs. 

  4. The operation of DTMF • DTMF used in the telephone switching centers to identify the number dialed by the caller. • A DTMF decoder distinguishes the DTMF tones and produces the binary sequence as parallel output as Q1,Q2,Q3 and Q4 equivalent to key pressed in keypad. • M-8870 DTMF decoder IC decodes tone generated by the keypad of cell phone

  5. APPLICATIONS • Home Automation System • Mobile Controlled Land Rover • Range of Working as large as is the network coverage of service provider. • Any digital circuit which takes commands from pre processed micro controller/processor can be controlled.

  6. THANK YOU

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