remote control using dtmf
TRANSCRIPT
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REMOTE CONTROL REMOTE CONTROL USING DTMFUSING DTMF
Project guide :- Reena Project guide :- Reena kumbharekumbhare
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Inhouse projectInhouse project
Pramod Avula Pramod Avula Roll no :- 4Roll no :- 4
D Shreenivasrao D D Shreenivasrao D Roll no :- Roll no :- 99
Sitaraman V Iyer Sitaraman V Iyer Roll no :- 33Roll no :- 33 Vivek Metkar Roll no :- Vivek Metkar Roll no :-
4343
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Aim of the project:-Aim of the project:-
To Perform Remote To Perform Remote Switching of appliances Switching of appliances & other industrial & other industrial applications using applications using DTMF.DTMF.
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DTMFDTMF (Dual Tone (Dual Tone Multi Frequency)Multi Frequency)
Was developed at Bell labsWas developed at Bell labs To allow dialing signals over nonwire To allow dialing signals over nonwire
links links Also Known as Touch tone Also Known as Touch tone Are also sometimes used in Are also sometimes used in caller IDcaller ID
systems systems Developed in the 1950’s,it became Developed in the 1950’s,it became
obsolete a decade after it was obsolete a decade after it was institutedinstituted
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Initial Telephone Initial Telephone exchangeexchange
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DTMF keypad DTMF keypad frequencies frequencies
f(t) = Asin(2*П*fa*t) + f(t) = Asin(2*П*fa*t) + Bsin(2*П*fb*t) Bsin(2*П*fb*t)
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DTMF Waveforms DTMF Waveforms
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Block diagram & Flow Block diagram & Flow chartchart
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Flow Chart
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MT8870MT8870
Basic Working : Receives DTMF Basic Working : Receives DTMF signal and converts to respective signal and converts to respective BCDBCD
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FeaturesFeatures
Integrates both band split filter and Integrates both band split filter and decoderdecoder
uses a digital counting technique uses a digital counting technique provides a differential input provides a differential input
operational amplifier as well as a operational amplifier as well as a bias source bias source
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Hardware components & Hardware components & Software tools used.Software tools used.
AT89C51 AT89C51 MicrocontrollerMicrocontroller
IC MT8870 DTMF IC MT8870 DTMF DecoderDecoder
Component Component DescriptionDescription
APR6008 Voice ICAPR6008 Voice IC LM386 Audio LM386 Audio
Power AmplifierPower Amplifier
HA 17358 HA 17358 Operational Operational AmplifierAmplifier
L78XX Voltage L78XX Voltage RegulatorRegulator
BC547 TransistorBC547 Transistor Keil programming Keil programming
kitkit
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Work done in Sem VIIWork done in Sem VII
Studied DTMF Studied DTMF Worked on Literature surveyWorked on Literature survey Have the final list of Hardware Have the final list of Hardware
ComponentsComponents
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Future Course of ActionFuture Course of Action
In our project, basically 6 modules are In our project, basically 6 modules are required to be designed.required to be designed.
Power SupplyPower SupplyMicrocontroller BoardMicrocontroller BoardRing Detector CircuitRing Detector CircuitDTMF Decoder CircuitDTMF Decoder CircuitVoice IC CircuitVoice IC CircuitRelay Board Relay Board
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Final look of projectFinal look of project
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List of ReferenceList of Reference Microprocessor Microprocessor
Architecture, Architecture, programming and programming and applications -applications -GaonkarGaonkar
The 8051 Microcontroller-The 8051 Microcontroller-AyalaAyala
Op-Amps and linear Op-Amps and linear integrated circuits -integrated circuits -GayakwadGayakwad
Electronic Communication Electronic Communication Systems-Systems-Wayne TomassiWayne Tomassi
http://.http://.electronics.howstuffworks.electronics.howstuffworks.comcom//
www.google.comwww.google.com www.datasheetarchive.cowww.datasheetarchive.co
mm www.atmel.comwww.atmel.com http://en.wikipedia.org/http://en.wikipedia.org/
wikiwiki http://www.tkk.fi/Misc/http://www.tkk.fi/Misc/
Electronics/circuits/Electronics/circuits/telephone_ringer.htmltelephone_ringer.html