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

•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.

Abstract

•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.

•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.

Low power consumptionSmall size, light weightEase of implementationReliable data transferAppropriate level SecurityLow costFast acquisition timeData rates of 250 kbps (@ 2.4GHz), 40 kbps

(@915 MHz) and 20 kbps (@ 868MHz )

Frequency: 2.4 GHzPower Output: 1mWMaximum Range: 90mRF data rate: 250 kbps

•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.

Image Black & White 128 x 64 pixels

Colour to Gray Scale

Conversion Of Coloured To Black & White Image

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

Gray Scale: 0-255Greater than 128 = 1Less than 128 = 0

Coloured to Black & White

Start

Read data from Xbee

Is any new data

Refresh GLCD

Stop

No

Yes

Flowchart 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.

Start

Read Image (B)

Is imagecolour

Convert to Black and White

Convert to Gray Scale

Flowchart Of MATLAB Programming

A

Yes

No

Is size greater than or less than

or equal to 128 x 64

A

Enlarge Shrink

Transmit to USBCom Port

Is end of Program

Stop

B

Less

Equal

Greater

Yes

No

•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

•Low cost.•Secured data.•Wireless communication.•Recovery of data after power failure.•Energy efficient.

• Limited range.• Costly compared to black board.• PC Dependant• Small LCD size 128*64• Black and white

•At schools, colleges for displaying assignments. •Public places, hospitals, government offices etc.