zigbee notice board presented by: yash shah (d.j.s.c.o.e.) zarna parekh (d.j.s.c.o.e.) hansal shah...
TRANSCRIPT
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
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.
What is 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
• 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
• Frequency: 2.4 GHz• Power Output: 1mW• Maximum Range: 90m• RF data rate: 250 kbps
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.
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
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.
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
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
• Low cost.• Secured data.• Wireless communication.• Recovery of data after power failure.• Energy efficient.• Fast since only white and black
Disadvantages
• Limited range.• Costly compared to black board.• PC Dependant• Small LCD size 128*64• Black and white only
Application• At schools, colleges for displaying
assignments. • Public places, hospitals, government offices
etc.
ANY QUESTION