dtmf (mobile) based automation
TRANSCRIPT
Designed by-Yogesh Kumar 1
How to design a electronic system ?
Block diagrams
Electronic circuit
HACS
Mobile remote control
DTMF & Cell phone
Mobile network
Signal Decoding
MCU
Interfacing MCU & 220VAC Mains supply
Conclusion
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Pick a problem from daily life.
Check what you have & what you want ?
Design flow of process.
Draw block diagrams.
Explore each process as you can.
Now its time to design electronic circuit. Choose electronic
components as per requirement.
Assemble & connect complete system circuit.
Test it , Now your system is ready to work.
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Block diagrams
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PROCESS PROCESS
OUTPUT
INPUT
You Have
You Want
SYSTEM FUNCTION
Electronic circuit
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Clock Generator Decade Counter
HACS [Home Automation Control System]
Home Appliance Control System accessed by a remote device such
as mobile phone or a palm-top(PC) to allow a home owner to control,
monitor and coordinate home appliances.
The following picture gives an
overview of how the system is works.
HACS
is a system which provides
various services to remotely
operate on home appliances.
The HACS system receives
commands from remote devices that are
manipulated by user.
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Need of Automation
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1. Saves time
2. Save money (Long run)
3. Self Maintenance
4. Security
5. Makes life easy
When: you are in a traffic jam
on the highway
What: You set microwave
oven in a slow cooking mode
Oven
Mobile Network & Remote Control
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SMS Based
DTMF Based
GSM Data logging
BTS
MS
DTMF- High Compatibility with all cell phone models Very cheap ,Easy to implement
BTS
GSM / CDMA
NETWORK
MS
DTMF Signals
DTMF is a signalling system for identifying the keys or better say the
number dialled on a pushbutton or DTMF keypad.
DTMF is a multi frequency tone dialling system used by the push
button keypads in telephone and mobile sets to convey the number or
key dialled by the caller.
DTMF has enabled the long distance signalling of dialled numbers in
voice frequency range over telephone lines.
DTMF (Dual tone multi frequency) as
the name suggests uses a combination of two
sine wave tones to represent a key.
These tones are called row and column
frequencies as they correspond to the layout of
a telephone keypad.
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DTMF signaling application
DTMF tones are thus mainly used at the telephone switching
centres for detection of dialled/called number.
IVR systems , Call centers ,Security systems.
DTMF tones were also used by terrestrial stations for turning on
and shutting off remote transmitters.
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DTMF to BCD decoding
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3.5 mm Jack
3.5 mm audio
connector
220VAC Mains Interfacing
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Mobile Remote Control System
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Microcontroller
Voice Chip
DTMF Decoder chip
Device No. 1 Device No. 2 Device No. 3
To/from Phone Jack (Output/Input)
Outputs
Data Access Arrangement Chip
SS Relay SS Relay SS Relay
MCU Electronic Circuit
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Project at a glance
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Want to ask ???
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Any doubts or queries……
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