SMS Based Wireless Electronic Notice Board
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
ATMEGA8L 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 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 ATMEGA8L. The message which is already stored
in the EEPROM is displayed on the LED Matrix Display Array. 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.
An
embedded system is a combination of software and hardware to perform a
dedicated task. Some of the main devices used in embedded products are
Microprocessors and Microcontrollers, Microprocessors are commonly referred to
as general purpose processors as they simply accept the inputs, process it and
give the output. In contrast, a microcontroller not only accepts the data as
inputs but also manipulates it, interfaces the data with various devices,
controls the data and thus finally gives the result. As everyone in this
competitive world prefers to make the things easy and simple to handle, this
project sets an example to some extent.
This project is built around the
ATMEGA8L micro controller from Atmel. 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 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 ATMEGA8L. 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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