Final Seminar Presentation

7/29/2019 Final Seminar Presentation

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HOME AUTOMATION

SYSTEMPPROJECT GUIDE : N.M.YEWALE Sir

By,

2) Saurabh Niley

1) Rupesh Derkar


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In home, we have many electronic and electricaldevices like heaters, air-conditioners, water pumps,fridge e.t.c.

These devices are controlled manually throughswitches.

Some times we are out of our homes and appliances atour homes are still working (On).

So it would be an advantage if we can control theappliances at our homes through a simple system likemobile phones.


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Here we are introducing such a system which does not

require any radiations, any laser beam which has no

limitation of range, Means it can be used from any

distance from meters to thousand kilometers using asimple telephone line or mobile phone. Here we are

using a telephone as a media, which serves main part

of this system. By using home phone as a local phone

and another phone - either landline or mobile phone asa remote phone we are controlling devices.


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This system uses Dual Tone Multi Frequency (DTMF)signalling.

We have two types of dialling facilities in our

telephones1) Pulse dialling mode 2) Tone dialling mode

Our system works on tone dialling mode.


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1)Remote section-It is nothing but mobile phone whichis in remote place. This may be yourworkspace(office/school) phone or mobile phone.

2)Local control section-This is a control system throughwhich you can control your home appliances. Thiscontains one telephone line and a control unit .Theappliances to be controlled must be connected totelephone line through control unit .Control unit iskept with a sufficient backup .


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COMPONENT REQUIRED

PIC16F84A Microcontroller

Resistor/Capacitor/Diode

IC ULN 2003, IC HT9170, IC 7805

Relay OR Contactor

Connector

Mobile phone


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BLOCKDIAGRAM

HT9170DTMF

DECODER

MICROCONTROLLERPIC16F84A

RELAYDRIVER

MOBILE

Load 1

Load 2

Load 3

Load 4

Load 5


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The circuit diagram shown in last slide is a DTMFencoder which resembles telephone set.

It uses DTMF encoder Integrated circuit, chip

UM91214B. This IC produces DTMF signals. It contains four row frequencies and three column

frequencies. The pins of IC91214B from 12 to 14produces high frequency column group and pins from15 to 18 produces the low frequency row group.

By pressing any key in the keyboard correspondingDTMF signal is available at its output pin i.e at pinno.7.


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IC MT8870 serves as DTMF decoder. The MT8870 is a full DTMF receiver that integrates

both band split filter and decoder functions into asingle 18-pin DIP.

This IC takes DTMF signal coming via telephone lineand converts that signal into respective BCD number.

MT8870 operating functions include a band split filterthat separates the high and low tones of the received

pair, and a digital decoder that verifies both thefrequency and duration of the received tones beforepassing the resulting 4-bit code to the output bus .


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High Performance RISC CPU Features

Only 35 single word instructions to learn All instructions single-cycle except for program

branches which are two-cycle Operating speed: DC - 20 MHz clock input DC - 200 ns instruction cycle 1024 words of program memory 68 bytes of Data RAM 64 bytes of Data EEPROM 14-bit wide instruction words 8-bit wide data bytes 15 Special Function Hardware register


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It performs the various functions, such as

1)Decoding

2)Device status check

3)Device switching4)Device status feedback

It takes 4 line BCD input and selects respective outputone among the multiple output lines .This decodes

four binary-coded inputs into one of sixteen mutuallyexclusive outputs, by which one of the devices will beselected that which we want to control.


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To carry out the switching of any appliances or deviceswe commonly use the relays.

Since the output of the D flip flop is normally +5v or itis the voltage of logic high state .So we cannot use thisoutput to run the appliances .Therefore here we userelays which can handle a high voltage of 230 volts ormore and a high current in the rate of 10 amps toenergize the electromagnetic coil of the relay .


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We can use this system as,

Telephone switch equipment.

Remote data entry

Paging systems Personal computers

Credit card systems


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Internet

Data sheet of PIC16F84A

Datasheet of ULN2003/HT9170

Datasheet of relay


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Documents

Final Seminar Presentation