1.REMOTELY OPERATED HOME APPLIANCES. 2.MISUSE OF POWER. 3.SECURITY SYSTEM.

DTMF stands for dual tone multiple frequencies. DTMF is a term which used in telephone engineering. When any key on mobile phone is pressed one tone is generated which consists of two frequencies among which one is higher and another is lower range and it is capable of being heard which is nothing but a DTMF tone. To decode DTMF tone from mobile phone we need MT8870 DTMF decoder IC, 3.5mm auxiliary cable, male and female connector.

PIN DIAGRAM

The Physical Size of the Different Resistors

Capacitors LED

~:Software Design:~

~:Future Scope:~ Here we design a prototype model. In this project we used LED indicating household appliance. In future we have planned the project for control of real time appliances like fan,light,freeze etc. through relay. At present we have design only 4 devices. But it can be design for ample number of devices.

REFERENCE BOOKS WEBSITE  PROGRAMMING IN ANSI C: E Balaguruswamy  THE 8051 MICROCONTROLLER AND EMBEDDED SYSTEM: Janice Gillespie Mazidiwww.datasheets4u.com Muhamomad Ali Mazidi  ELECTRONICS FOR YOU (e.f.y) MAGAZINE:  ELECTRONICS CIRCUIT FUNDAMENTAL: J.V. Suresh Babu  ELECTRONICS DEVICES AND CIRCUITS: B.N. Yoganarsimha  EMBEDDED SYSTEM DESIGN: Frank Vahid

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