This document introduces a student project to design a home appliance control system using Dual Tone Multi Frequency (DTMF) technology. The system would allow wireless control of home appliances via mobile phone keys corresponding to different devices. When a key is pressed, an encoder would send the user's choice via GSM to a receiver, which would decode the DTMF signal and trigger the appliance selected by the user. The goal of the project is to gain practical engineering skills and knowledge to increase productivity and efficiency in industries.

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PREFACE
Engineering is not only a theoretical study but it is an implementation
of all .We study for creating something new and making things more
easy and useful through practical study. It is an art which can be
gained with systematic study, observation and practice. In the college
curriculum we usually get the theoretical knowledge of industries and
a little bit of implementation knowledge that how it works? But how
we prove our practical knowledge to increase the productivity or
efficiency of industries? To overcome such problem we student of
SHANKARA INSTITUE OF TECHNOLOGY, KUKAS, JAIPUR
are supposed to make project on “DTMF BASED HOME
APPLIANCES CONTROL SYSTEM”. This project is designed to
control the home appliances utilizing Dual Tone Multi Frequency
(DTMF) that is paired with a wireless module to provide seamless
wireless control over many devices in a house. In this system we use
mobile keys, each corresponding to the device that needs to be
activated/deactivated. The encoder encodes the user choice and sends
via a GSM transmitter. The GSM receiver receives the modulated
signal and demodulates it and the user choice is determined by the
DTMF decoder. Based upon this the required appliance is triggered.