From the past many years we are seeing the notices of the college , companies ,offices is usually displayed on the normal board having number of notices written on the same board .So we were thinking that if all these notices are displayed at the same place one by one except occupying the whole board area.
So we come to the conclusion to design a Notice board such that it can fulfill the requirements such as less manual operation, same notice can be displayed at the various places at the same time, the notice (board display) should be visible from maximum area or distance, compact and compatible, easy handling.
1.2 What is Digital Notice Board System?
It is a system having digital notice board. The notice can be displayed on the digital display in the rolling manner. The notice can be typed or edited on the PC. And then it will send the notice to every display connected to the system. Also we can receive the notice on Mobile phone through the GSM (wireless communication) Technology and display it on the digital display boards using the PC having the connectivity’s like Hyper terminal/AT commands/VB software.
In this way we can save the work as required for a regular notice board.
Fig.1.1 Plan view for college Digital Notice Board System
1.2.1 INPUTS DEFINED IN THE PROJECT
Message received from mobile phone
Message typed on the PC(computer)
1.2.2 OUTPUTS DEFINED IN THE PROJECT
Block diagram of Digital Notice Board System.
2.2 Block Diagram Description:
In our project we are going to demonstrate the Digital Notice Board system using rolling display .Also we are going the SMS/GSM technique
The blocks shown in the diagram are described as below:
2.2.1 Dedicated mobile:-
In our day today life we know most of the peoples used the mobile phones .The peoples used the phones to achieve or to get the different facilities .The mobile phone can provide the different facilities such as SMS,GPRS,MMS,VOICECALLS,DATA CALLS, GPRS, Entertainment flexibility in work.
As shown in the block diagram we are sending the notice board through SMS. Since we are using SMS to transmit the Notice, distance not an issue because the SMS can be sent anywhere in the range.
Some of these facilities are useful in our project so we are using the SMS that is GSM techniques to transfer data from distant places such as from one area to the another area of the same college.
In our project we are using SMS technique to instant or quick transfer of data or notice to the required destination that is college or department.
This above given use or function is provided by the dedicated mobile use in our digital notice board system.
We are using the VB software in our PC for the user interface with the system. With the help of this VB software any user can easily make the use of the system.
This VB software provides the notice typing and editing facility. Also we can copy the same content as received through mobile in the editing window and call it as a notice.
Hence the PC/VB software provides the typing, editing and formatting options to the user.
2.2.3 RS 232:
RS 232 is a serial communication cable used in the system. Here, the RS 232 provides the serial communication between the Zigbee module and the PC. So it is a media used to communicate between Zigbee and the PC.
In our project the RS232 serves the function to transfer the edited notice (or data) from PC (VB software) to the Zigbee RF module, for the further operation of the system.
2.2.6 Microcontroller ARM 7:
In our project we are feeding the program to the microcontroller to collect the data or notice transferred from PC through RS 232 and Xbee modules.
After collecting or receiving the data it will save the received data into its on-chip memory.
And then as given in the program the controller will send or display the notice on the alphanumeric display in the required fashion i.e. rolling fashion.
In our project we are using the alphanumeric display. As the name “Alphanumeric display” suggests it is a type of display .But the difference between a normal display and the alphanumeric display is that it can display Alphabets as well as Numbers on it. So we don’t need the extra programming required to display the alphabets like in normal (LED Display).
Also it is brighter than the normal LED display.
Here we are using LED based Alphanumeric display of 1 inch size. The reason for selecting bthe display is that the visibility and clarity is pretty good from a long distance.
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