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ZIGBEE NOTICE BOARD. Presented By: Yash Shah (D.J.S.C.O.E.) Zarna Parekh (D.J.S.C.O.E.) Hansal Shah (D.J.S.C.O.E.) Guided by : Prof.Ninad Mehendale. Abstract. Wireless board Message sent by the PC is transmitted through Xbee at free of cost and displayed on Graphic LCD.

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ZIGBEE NOTICE BOARD

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Zigbee notice board

ZIGBEE

NOTICE BOARD

Presented By:

Yash Shah(D.J.S.C.O.E.)

Zarna Parekh(D.J.S.C.O.E.)

Hansal Shah(D.J.S.C.O.E.)

Guided by :

Prof.Ninad Mehendale


Zigbee notice board

Abstract

Wireless board

Message sent by the PC is transmitted through Xbee at free of cost and displayed on Graphic LCD.

Range of Xbee is 300-400m.


Introduction

Introduction

Advanced hi-tech notice board.

Information transmitted at a much faster rate.

Interfacing a display with microcontroller and updating the data to be displayed using a zigbee module.

Zigbee is a low power wireless technology.


Why zigbee

Why ZigBee?

ZigBee is a technology of data transfer in wireless networks.

Zigbee is a PAN technology based on the IEEE 802.15.4 standard.

ZigBee devices have the ability to form mesh networks between nodes, which can be expanded and multiplied in order to cover larger area.

It has low energy consumption and is designed for multi-channel control systems, alarm systems, and lighting control.

It also has various home and industry applications.


Characteristics of zigbee

Characteristics of Zigbee

  • Low power consumption

  • Small size, light weight

  • Ease of implementation

  • Reliable data transfer

  • Appropriate level Security

  • Low cost

  • Fast acquisition time

  • Data rates of 250 kbps (@ 2.4GHz), 40 kbps (@915 MHz) and 20 kbps (@ 868MHz )


Standard xbee protocol

Standard Xbee Protocol

  • Frequency: 2.4 GHz

  • Power Output: 1mW

  • Maximum Range: 90m

  • RF data rate: 250 kbps


Working of hardware

Working Of Hardware

  • Microcontroller ATMEGA8 of 8KB memory.

  • Crystal oscillator of 16MHz.

  • Pull up resistor of 10 KΩ.

  • Xbee module for reception and transmission of data.

  • GLCD is used 128 x 64 pixels

  • Transmitting via USB port to RS232 port connected to Xbee module

  • Xbee is transmitting at PAN ID 31 and baud rate of 115200 to other Xbee.


Zigbee notice board

Conversion Of Coloured To Black & White Image

Image

128 x 64 pixels

Black & White

Gray Scale: 0-255

Greater than 128 = 1

Less than 128 = 0

Colour to Gray Scale

  • MATLAB program reads the image.

  • If it is coloured, the image will be converted to Gray scale and eventually to Black & White.


Zigbee notice board

Coloured to Black & White


Zigbee notice board

Flowchart Of Microcontroller

Start

Read data from Xbee

Is any new data

No

Yes

Refresh GLCD

Stop


Algorithm of microcontroller

Algorithm Of Microcontroller

Start

Read data from Xbee

Checks if any new data is there

If yes Refresh GLCD else read for new data from Xbee

After refreshing the GLCD it will again check for new data and this process continues.


Zigbee notice board

Flowchart Of MATLAB Programming

Start

Read Image (B)

Is image

colour

Yes

Convert to Gray Scale

No

Convert to Black and White

A


Zigbee notice board

A

Is size greater than or less than or equal to

128 x 64

Less

Greater

Shrink

Enlarge

Equal

Transmit to USB

Com Port

B

Is end of Program

No

Yes

Stop


Algorithm of matlab programming

Algorithm Of MATLAB Programming

The program will read the image.

Check whether the image is coloured.

If yes, it will convert to Gray Scale and then to Black & White or else directly to Black & White.

It then checks for the size, if it is greater than 128x64 it will shrink the image and if its less than 128x64 it will enlarge.

The image is transmitted to USB COM port.

It will check for the last image, if it is the last image it will end the program or else will read a new image


Advantages

Advantages

Low cost.

Secured data.

Wireless communication.

Recovery of data after power failure.

Energy efficient.


Disadvantages

Disadvantages

  • Limited range.

  • Costly compared to black board.

  • PC Dependant

  • Small LCD size 128*64

  • Black and white


Application

Application

At schools, colleges for displaying assignments.

Public places, hospitals, government offices etc.


Any question

ANY QUESTION


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