08-08-2014, 12:18 PM
SMS BASED NOTICE BOARD
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INTRODUCTION
GSM and GPRS based designs have developed another innovative and public utility product for mass communication. This is a scrolling (moving) message Electronic Display Board which displays the messages received as SMS or GPRS Packets. Such displays can be kept at differentparts of the city and the messages like advertisements, news. Public can send flash information from mobiles or PCs to these displays for instantviewing. These displays are designed to quickly display large amounts ofinformation in the liquid crystal display. Wireless communication hasannounced its arrival on big stage and the world is going mobile. Wewant to control everything and without moving an inch. This remote controlelectronic notice board is possible through Embedded Systems. The use of“Embedded System in Communication” has given rise to many interestingapplications that ensures comfort and safety to human life. The main aim ofthe project will be to design a SMS electronic display toolkit which canreplace the currently used programmable electronic display. The message to be displayed is sent through a SMS from an authorized mobile phone. The toolkit receives the SMS validates the sending mobile identification.
Number (MIN) and displays the desired information after necessary codeconversion. The system is made efficient by SIMs so that the SMS can bereceived by number of display boards in a locality using techniques of time division multiple access. We have improved upon the currently usedprogrammable electronic display and tried to take advantage of thecomputing capabilities of microcontroller. We envision a toolkit that will notonly display message but also can be used to do some mechanical work.Looking into current trend of information transfer in this campus (VCE) it is seen that important notice take time to be displayed onthe notice boards. This latency is not expected in most of the cases andmust be avoided. It is proposed
LITERATURE REVIEW
This project is an implementation to the idea of the wireless communication between a mobile phone and a microcontroller. Currently the main work that has been done on this proposed system is through serial port to the computer but not wireless. If they want to change the message, they have to go to the remote area with the laptop and change the message. The system has to be reprogrammed to display new messages. But in this new design, the systems need not be reprogrammed to display new messages because it is wireless. The user will send SMS from his phone and it will be display on the electronic board which is being made up of liquid crystal display. In the new system, when new messages enter, the old messages will be deleted.GSM was designed with a moderate level of security. The system was designed to authenticate the subscriber using a pre-shared key and challenge-response. Communications between the subscriber and the base station can be encrypted.
THEORETICAL BACKGROUND
GSM (Global System for Mobile communications: originally from GROUPE Special Mobile) is the most popular standard for mobile phones in the world. Its promoter, the GSM association, estimates that 80% of the global mobile market uses the standard. GSM is used by over 3 billion people across more than 212 countries and territories .Its ubiquity makes international roaming very common between mobile phone operators enabling subscribers to use their phones in many parts of the world. GSM differs from its predecessors in that both signalling and speech channels are digital and thus is considered a second generation (2G) mobile phone system.
GSM ARCHITECTURE
GSM is a complex system and difficult to understand. The Mobile Station (MS) refers to the mobile equipment. The Base Station Subsystem controls the radio link with the Mobile Station. The Network Subsystem performs main functions such as switching of calls between mobile users, mobility management operations, and proper operation and setup of a network .These functions are controlled by the Mobile Services Switching Center (MSC).
SUBSCRIBER IDENTITY MODULE (SIM)
One of the key features of GSM is the Subscriber Identity Module,commonly known as a SIM card. The SIM is a detachable smart cardcontaining the users subscription information and phone book. This allows the user to retain his or her information after switching handsets.Alternatively, the user can also change operators while retaining the handsetsimply by changing the SIM. Some operators will block this by allowing thephone to use only a single SIM, or only a SIM issued by them; this practiceis known as SIM locking, and is illegal in some countries.
CONCLUSION
The prototype of the GSM based display electronic notice board can be efficiently designed. This prototype has facilities to be integrated with a display board thus making it truly mobile. The toolkit accepts the SMS, stores it, validates it and then displays it in the LCD module. The SMS is deleted from the phone each time it is read, thus making room for the next SMS. The major constraints incorporated are the use of ‘*’ as the termination character of the SMS and the display of one SMS as at a time. These limitations can be removed by the use of higher end microcontrollers and extended RAM. The prototype can be implemented using commercial display boards. In this case, it can solve the problem of instant information transfer in this campus(VCE).