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ZIGBEE COMMUNICATION WITH EMBEDDED APPLICATION and PC

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Abstract:

This project deal with the communication with embedded application which will have a display device with Zigbee module and on the other side personal computer with Zigbee module, data transferred from system through. Zigbee module reach embedded application via Zigbee module.
An embedded system is a special-purpose computer system designed to perform one or a few dedicated functions, often with real-time computing constraints. It is usually embedded as part of a complete device including hardware and mechanical parts. In contrast, a general-purpose computer, such as a personal computer, can do many different tasks depending on programming. Embedded systems control many of the common devices in use today
A personal computer (PC) is a computer whose original sales price, size, and capabilities make it useful for individuals, and intended to be operated directly by an end user, with no intervening computer operator.
Block diagram:


ZIGBEE COMMUNICATION:
The XBee OEM RF Modules were engineered to operate within the ZigBee protocol and support the unique needs of low-cost, low-power wireless sensor net-works. The modules require minimal power and provide reliable delivery of data between remote devices. Both modules operate within the ISM 2.4 GHz frequency band and are pin-for-pin compatible with each other.

Power Supply:
The power supply unit is used to provide a constant 5V supply to different IC’s this is a standard circuits using external 12VDC adapter and fixed 3-pin voltage regulator. Diode is added in series to avoid Reverse voltage.

Micro controller:
The 89C51 is a low cost Micro controller from either ATMEL or PHILIPS. It has a 40-pin configuration and other components are interfaced to its ports. The entire functionality of the CLIP device is under the control of Micro controller. The Micro controller takes input from the external sources and routes them to the appropriate devices as programmed in it.

LCD Display:
LCD display is a two line of total 32 characters unit used as an interface for the user. Interface with Micro controller is accomplished via 8-data lines D7 – D0 and three control lines, Reset (RS), Read/Writ(R/W) and Enable (E). These 11-lines of the Micro controller display all messages and telephone numbers.

PS/2 Keyboard:
In PS/2 Keyboard each button will generate unique Scan Code when pressed.