New inventions are never made by hardworking people but are done by

the lazy ones who always want to reduce their efforts…

IntroductionMobile Phone = SMS + Calls + Multimedia + Internet +

Camera

Mobile Phone = All Above + Your house hold servant( to switch on or off your appliances or park your vehicle and the list goes on…)

And a very reliable servant.

What’s coming in next 5 mins.Technology Used

Implementation (What we have done)

Possible Applications

Future Planning

Suggestions and Queries Session

Technology used

Call your host mobile.Once call is connected with each key press user can

control predefined applications.Example toggle your AC On and Off by pressing key 1.

What’s inside black boxBlack box consists of DTMF

decoder and relay circuits for integrating it with household circuits

Technology used in interactive voice response system (IVRS) i.e. the customer care centre.

DTMF stands for dual tone multiple frequency

Every key of telephone is associated with a tone comprising of frequencies from two groups viz. low freq. and high freq. group.

DTMF_Decoder.wav

What we have done Designed DTMF decoder

circuit which consist of three parts:-

i. DTMF to BCD decoder

ii. BCD to 1 of 12 decoder

iii. Relay circuit controlling

We have implemented this for controlling

i. Controlling four motions of robot

ii. And controlling household devices

What we have done contd.This video describes the

functioning of our circuit displayed via Oscilloscope.

A key press 2 will make the output from relay output +12V

And key press 8 will make it -12V

And key 5 to reset.

What we have done contd.This is the implementation

on a robot by above circuitry

Showing movement of robot by keys 2,8,4,6 for all four movements

Possible applications

The application may be as follows:-• Switching of lights or A/C of your home from remote

area.• Controlling robot• For surveillance purpose by video calls.• For video conferencing and camera control by (needs

3G service)

Future planning

Can be integrated with PC or microcontrollerResulting in dedicated interactive voice response system

(IVRS)Which can control many devices at once.This is integrated by the help of a software which we have

made which is under pipelines.

This is the front end user interface for decoding the DTMF signals.

When any DTMF audio file is sourced to it then…

GUI showing the decoded DTMF signalsFor key pressed with more than 1sec delay are considered

new world

• We have used FORTRAN for this.

Future planning cont.In coming days we will be completing the full

softwareWith dedicated IVRS response and fully

automatic real time DTMF decoding.And your PC will be connected to your

appliances as peripherals.And we can control our house by interacting

with audio stored in PC

For further detailed description contact- www.dei.ac.in/engineering/ugprojects/dtmfdecoder.html