IR Based Home Automation

IR Home Automation System

- Using NEC Protocol and ATMega16 Microcontroller

Presented By :

Sujit K Nayak

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Introduction….

In this project, we have designed an infra red

remote receiver, using which we can

remotely operate all the electrical appliances

at our home.

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Components Used…

ATmega 16L : Microcontroller

TSOP 1738 : IR Sensor

ULN2003 : Relay Driver

Relay Board to Interface Home Appliances

16x2 LCD Display

STK 200 Programmer Hardware

12 V Power supply

LM7805 5 Volt regulator and some other commonly used components.

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Protocol and Programming Software…

The Protocol used in this Project is NEC.

The Programming Software (i.e Compiler

and Assembler ) we have used is

CodeVision AVR.

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The NEC Protocol…

Here, encoder chip used in the remote

controller is HT6221. It is capable of

encoding 16 bit address codes and 8 bit data

codes. It contains 32 keys (K1-K32). The

programmed data/address is transmitted

together with the header bits via an IR(38kHz

carrier) transmission medium.

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The NEC Protocol…

Transmission codes

The transmission codes of the HT6221 consists of a 9ms header code, a 4.5ms off code, 16 bit address code (18ms-36ms),8 bit data codes (9ms-18ms), and the inverse code of the 8 bit data codes.

The transmission codes employ the PPM (Pulse Position Modulation) method to represent their two logic states by “0” (1.12ms) and “1” (2.24ms).

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NEC Protocol Timing Diagram…

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NEC Protocol Timing Diagram…

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STK 200.. Programmer

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Main Board…

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Schematic Diagram …

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Conclusion…

Using this Device we can Operate Home

appliances easily and more comfortably.

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References…

www.sbprojects.com

www.mcselectronics.com/library

www.en.wikipedia.com/necprotocol

www.sourceforge.net.winlirc

www.atmel.com

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Thank U…