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 AT89S52 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 GSM/CDMA Mobile Can is used to
enter the required text or notice. The scrolling speed of the text also can be
changed according to user requirement.
After
entering the text the SMS is sent to the no which is connected to the LED display.
At any time the user can add or remove or alter the text according to his
requirement.
At
the receiving end the GSM modem which is connected to the Max 232 receives the
message and is connected to the microcontroller AT89S52. The message which is
already stored in the EEPROM is displayed on the LED Display.
This
project uses regulated 5V, 500mA 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:
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