ppt dtmf based home automation system

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Designed by-Yogesh Kumar

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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
Designed by-Yogesh Kumar

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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.

Designed by-Yogesh Kumar

Block diagrams

INPUT

You Have

PROCESS

PROCESS

SYSTEM FUNCTION

OUTPUT
You Want

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Designed by-Yogesh Kumar

Electronic circuit
Clock Generator

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Decade Counter

Designed by-Yogesh Kumar

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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Designed by-Yogesh Kumar

Need of Automation
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Saves time
Save money (Long run)
Self Maintenance
Security
Makes life easy

When: you are in a traffic jam on the highway
What: You set microwave oven in a slow cooking mode

Oven
Designed by-Yogesh Kumar

Mobile Network & Remote Control
SMS Based
DTMF Based
GSM Data logging

BTS

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MS

DTMFHigh Compatibility with all cell phone models
Very cheap ,Easy to implement

GSM / CDMA
NETWORK

MS

BTS

Designed by-Yogesh Kumar

DTMF Signals
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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.
Designed by-Yogesh Kumar

DTMF signaling application
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IVR systems , Call centers ,Security systems.

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DTMF tones are thus mainly used at the telephone switching centres for detection of dialled/called number.

DTMF tones were also used by terrestrial stations for turning on and shutting off remote transmitters.

Designed by-Yogesh Kumar

DTMF to BCD decoding
3.5 mm Jack

3.5 mm audio connector 11

Designed by-Yogesh Kumar

220VAC Mains Interfacing

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Designed by-Yogesh Kumar

Mobile Remote Control System
DTMF Decoder chip
To/from Phone Jack
(Output/Input)

Data Access
Arrangement Chip

Voice Chip

Microcontroller

Outputs

SS Relay

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SS Relay

SS Relay

Device No. 1

Device No. 2

Device No. 3

Designed by-Yogesh Kumar

MCU Electronic Circuit

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Designed by-Yogesh Kumar

Project at a glance

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Designed by-Yogesh Kumar

Want to ask ???

Any doubts or queries……

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Designed by-Yogesh Kumar

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Designed by-Yogesh Kumar