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Wireless Electronic Notice Board with Multi Point Receivers using Zigbee CommunicationSystem
Notice Board is
primary thing in any institution / organization or public utility places like
bus stations, railway stations and parks. But sticking various notices
day-to-day is a difficult process. A separate person is required to take care
of this notices display. This project deals about an advanced hi-tech wireless
notice board.
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Zigbee is a 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 AT89C51 micro controller from Atmel. This micro controller
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 multi point receivers. After entering the text, the
user can disconnect the keyboard. At any time the user can add or remove or
alter the text according to his requirement.
This project
uses regulated 5V, 1A power supply. 7805 three terminal voltage regulator is
used for voltage regulation. Bridge type full wave rectifier is used to rectify
the ac out put of secondary of 230/12V step down transformer.
