Vignesh 3rd Sem

8/2/2019 Vignesh 3rd Sem

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CONTENT1. INTRODUCTION2. GSM3. PLC 4. GENERAL DESCRIPTION OF THE SYSTEM

5. X10 Technology6. Microcontroller7. MAX2328. Power Line Carrier Modem9. Communication between Transmitter and Receiver10. ADVANTAGES & DISADVANTAGES11. APPLICATIONS12. CONCLUSION13. REFERENCE

CET DIGITAL SIGNAL PROCESSING


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INTRODUCTION As we all need an affordable smart system that can make our life

easier, more comfortable, offer more safety.

GSM based home automation system is one such system

Two main techniques applied in the system are:

-GSM

-PLC



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GSM GSM is the most popular and widely used digital mobile telephony

system in the world.

It is now used by over 1.5 billion people all over the world.

Second generation (2G) cell phone system.

GSM uses narrowband Time Division Multiple Access (TDMA) for

voice and Short Messaging Service (SMS).



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PLC

Power Line Communication or Power Line Carrier (PLC) is

basically a technology that enables narrow or broad band

speeds through power lines by varies advanced modulation

technology .

This technology doesnt require extra cabling. It only uses the

existing power cable in the house .



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GENERAL DESCRIPTION OF THESYSTEM



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X10 Technology

X10 is an international and open industry communication

standard protocol used to communicate among electronic

devices for home automation.

With X10, electronic devices that plugged into the wall socket

can communicate with each other.



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X10 Protocol X10 protocol is the language used for the control units to

communicate with each other.

Fig shows an example of X10 signal.

Basic X10 message consists of 13bits separated into 4 parts:


-first 4bits are start code which is 1110.

-second 4bits are house code.

-next 4bits are either unit code or function

code depends on the last code.

-last bit will decide the preceding 4bit are

unit code or function code.


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Example of Binary 1 and 0 X10Codes



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Microcontroller



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Microcontroller In this project, PIC16F877 and PIC16F628 are chosen to operate

in master and slave units respectively.

They are chosen based on the properties needed such as

number of input and output pin, RAM capacity, number of

internal timer, and etc for construction of circuits.

The main purpose of implementing microcontroller is to detect

zero-crossings and the 120kHz X10 data bursts on the 50Hz ACelectrical line.



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PIC16F877A PIC16F877A is chosen to be used in the master unit mainly

because more I/O port is needed compared to slave units.

There are five I/O port in PIC16f877A including port A, B, C,

D, and E. It can communicate with GSM modem with pin 25

(TX) and pin 26 (RX) which is bit 6 and 7 of Port C.



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PIC16F628 PIC16F628 is chosen as the slave units microcontroller due to its

less complexity compared to PIC16F877.

It is also a low cost with high performance CMOS microcontroller.

It has enhanced the core features.

8-level deep stack.

Multiple internal and external interrupt sources.

A total of 35 instruction sets are available (reduced instruction

set)



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MAX232



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MAX232

MAX232 is an integrated circuit (IC) that translates signals

from an RS232 serial port to signals suitable for digital logic

circuit.



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Power Line Carrier Modem



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Power Line Carrier Modem There are a few types of power line carrier modem available

in the market such as:

-TDA5051A (Philips).

-ST7537HS1 (ST Microelectronics).

-LM1893 (National Semiconductor)



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TDA5051A TDA5051A is one of the most popular PLC

modem IC in the market .

TDA5051A is a 16 pin integrated modem.

It uses minimum 600 baud and maximum

1200 baud data transmission rate.

A single 5V supply is needed to operate

this modem IC. Works in full duplex mode.

Pin Diagram of TDA5051A is as shown.



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Block diagram of TDA5051A



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Communication between Transmitter andReceiver



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Photo of the Testing Circuit



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Input Waveform at Transmitter andOutput Waveform at Receiver



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ADVANTAGES The technique is inexpensive . Easy to setup.

A printer or any other device that doesnt need to be directly

connected to a computer.



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DISADVANTAGES Data transmission rate is slow 50kbps to 350kbps.

The older wiring can affect performance.

The performance can be impacted by home power.



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FUTURE RECOMMENDATIONS FSK power line modem works better than ASK in the sense of

stabilization because the carrier has

-constant amplitude.

-it is immunity to non-linearities.

-immunity to adjacent channel interference and

-it has the ability to work in small SNR environments.

The data transmission rate can be increased by using INTELON

power packet technology of about 14Mbps.



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CONCLUSION The power line communication system for home automation

has been successfully studied.

However, there is error occur in the system due to the

sensitivity of the PLC modem and the disturbance in the

electrical line.

The main purpose of implementing power line

communication is because it doesnt require installing newwiring system because the data can be transmitted through

existing power line system.



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REFERENCE IEEE paper on Design of a Wireless Sensor Network Based

Monitoring System for Home Automation by Jun Zhang,

Guangming Song, Hui Wang and Tianhua Meng;

Archnet. (2010). Power Line Carrier Modem. Retrieved August

2, 2010, from

http://www.archnetco.com/english/product/PLM01.htm.

Serasidis Vasilis. (2006). SMS Remote Control. Retrieved June

14, 2010, from

http://www.serasidis.gr/circuits/smscontrol/smscontroller.ht

m.CET DIGITAL SIGNAL PROCESSING


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Thank you



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