wireless electronic notice board using zigbee
WIRELESS ELECTRONIC NOTICE BOARD WITH MULTI NODES USING ZIGBEE COMMUNICATION SYSTEM CHAPTER-1
1.1 INTRODUCTION:
Notice boards play a vital role mostly in educational institutions. The events, occasions or any news, which has to be passed to the students, will be written on the notice boards present in every floor in the colleges or schools. The present system is like, a person will be told the news and he has to update this news on all the notice boards present in the college or school. This will be seen mostly during the examination seasons. The time table or the schedule of the exams has to be given to the students. This will be done by writing the details on the notice boards. But this process consumes a lot time to update the news on all the notice boards and there may be chances that the person responsible may commit some mistakes or he may be absent sometimes. So, this may create disturbances and the entire schedule may be disturbed. To avoid all these, Wireless Notice Board have been designed which completely eliminates the manual work.
Zigbee is PAN technology based on the IEEE 802.15.4 standard. Unlike Bluetooth or wireless USB devices, zigbee devices have the ability to form a mesh network between nodes. Meshing is a type of daisy chaining from one device to another. This technique allows the short range of an individual node to be expanded and multiplied, covering a much larger area.
The project is built around the AT89S52 microcontroller from Atmel. This microcontroller provides all the functionality of the display and wireless control. It also takes care of creating different display effects for given text.
Alphanumerical keypad is interfaced to the transmitter to type the data and transmit. The message can be transmitted to multipoint receivers. After entering the text, the user can disconnect the keyboard. At anytime the user can add or remove or after the text according to his requirement.
1.1 INTRODUCTION:
Notice boards play a vital role mostly in educational institutions. The events, occasions or any news, which has to be passed to the students, will be written on the notice boards present in every floor in the colleges or schools. The present system is like, a person will be told the news and he has to update this news on all the notice boards present in the college or school. This will be seen mostly during the examination seasons. The time table or the schedule of the exams has to be given to the students. This will be done by writing the details on the notice boards. But this process consumes a lot time to update the news on all the notice boards and there may be chances that the person responsible may commit some mistakes or he may be absent sometimes. So, this may create disturbances and the entire schedule may be disturbed. To avoid all these, Wireless Notice Board have been designed which completely eliminates the manual work.
Zigbee is PAN technology based on the IEEE 802.15.4 standard. Unlike Bluetooth or wireless USB devices, zigbee devices have the ability to form a mesh network between nodes. Meshing is a type of daisy chaining from one device to another. This technique allows the short range of an individual node to be expanded and multiplied, covering a much larger area.
The project is built around the AT89S52 microcontroller from Atmel. This microcontroller provides all the functionality of the display and wireless control. It also takes care of creating different display effects for given text.
Alphanumerical keypad is interfaced to the transmitter to type the data and transmit. The message can be transmitted to multipoint receivers. After entering the text, the user can disconnect the keyboard. At anytime the user can add or remove or after the text according to his requirement.
References: The 8051 micro controller and embedded systems by Mazidi. www.wikipedia.org www.atmel.com www.8051projects.com Embedded systems with 8051 by kenith j ayala http://www.8052.com/tut8051 http://electrosofts.com/serial http://www.8052.com/tuttimer.phtml