MICROCONTROLLER BASED SYSTEM SHUTDOWN, RESTART, AND LOGOFF USING WIRELESS TECHNOLOGY

MICROCONTROLLER BASED SYSTEM SHUTDOWN, RESTART, AND LOGOFF USING WIRELESS TECHNOLOGY

            Wireless communication is the transfer of information over a distance without the use of enhanced electrical conductors or "wires". The distances involved may be short (a few meters as in television remote control) or long (thousands or millions of kilometers for radio communications). When the context is clear, the term is often shortened to "wireless". Wireless communication is generally considered to be a branch of telecommunications.

            Wireless communication, as the term implies, allows information to be exchanged between two devices without the use of wire or cable. In all such cases, information is being transmitted and received using electromagnetic energy, also referred to as electromagnetic radiation.

Infra-Red actually is normal light with a particular colour. We humans can't see this color because its wave length of 950nm is below the visible spectrum. That's one of the reasons why IR is chosen for remote control purposes.

In this application we are using IR communication as a wireless communication. To implement this application IR receiver is interfaced to microcontroller to read the remote key values. For different keys we are assigning different options (those are SHUT DOWN, RESTART and LOGOFF). After receiving commands from the remote, one predefined data is passed to system through serial communication. For this we have to use some DOS commands. Based on that DOS commands only, system SHUT DOWN, RESTART and LOGOFF is done.  

BLOCK DIAGRAM:

 REQUIREMENTS:

HARDWARE REQUIREMENTS:

Ø  AT89S52

Ø  MAX232

Ø  TSOP1738

Ø  16X2 LCD

Ø  SERIAL CABLE

Ø  TV REMOTE

SOFTWARE REQUIREMENTS:

Ø  PROGRAMMING IN EMBEDDED C

Ø  KEIL C COMPILER

Ø ISP PROGRAMMER