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.
Display is
obtained on 20X4 LED Matrix Display Array on a printed circuit board. 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 Matrix Display Array.
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 output of secondary of 230/12V step down transformer.
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