dtmf technology of mobile phone used for robotics and switching works
Post on 28-Nov-2014
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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
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