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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…
