ABSTRACT:
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.
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.
Matrix type display is designed using 5mm LED on a printed circuit board. A driver circuit is designed to drive all these LEDs. A simple PC key board can be connected to this system to enter the required text or notice. Several scrolling effects can be selected using function keys of keyboard. The scrolling spped of the text also can be changed according to user requirement.
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.
BLOCK DIAGRAM:
POWER SUPPLY:
Advantages:
Wireless System
Text can be entered from remote place
Data will not be lost in power failure condition
Applications:
Offices, educational institutions, bus stations, railway stations and other public utility places
