Now-a-days the general mass prefer communicating while on the move therefore landlines usage has been drastically reduced. Notice boards are one of the widely used ones ranging from primary schools to bus or railway stations to convey messages at large. All these systems are wired. The main aim of this project is to design a SMS driven electronic notice board which can replace the currently used wired conventional notice boards. By using the GSM we are designing the wireless electronic notice board with alert system for new arrival of messages. Sending the notice (SMS) over GSM network can make it possible to display notice from anywhere. This proposed system in this project has many upcoming applications in educational institutions and organizations, industrial management, advertisements. Being user friendly, long range and faster means of conveying information are major advantages for this application over conventional methods.
With the development of cellular networks in the 1970’s for increasing the lack of frequencies in the radiotelephone services which in turn lead to introduction of AMPS (Advanced Mobile Phone System) where the transmission was analog based. This was known to be the first generation in cellular networks. The second generation was based on digital transmission and was called with various abbreviations as GSM (Global System for Mobile communications), ERMES (European Radio Messaging System). Various Cordless telephone standards were also introduced during this time only. The third generation has risen with the unification of different technologies; some of them which are popularly known are FPLMTS (Future Public Land Mobile Telecommunications System), UMTS (Universal Mobile Telecommunication System) and IMT-2000(International Mobile Telecommunication). The Global System for Mobile (GSM) communication is the Second Generation of mobile technology. Although the world is moving towards Third and Fourth generation but GSM has been the most successful and widespread technology in the communication sector. GSM technology paved a new way for mobile communication.
Block diagram of the proposed circuit is given below:
A) GSM modem interfacing with PIC18F4550:
This GSM Modem can accept any GSM network operator SIM (Subscriber Identity Module) card and act just like a mobile phone with its own unique phone number. GSM modem has its own antenna for better connectivity. This GSM modem is interfaced with PIC18F4550 using RS232 interfacing. For voltage levels matching purpose we are using MAX232.
The MAX232 is an IC that converts signals from an RS-232 serial port to signals suitable for use in TTL compatible digital logic circuits. The MAX232 is a dual driver/receiver and typically converts the RX, TX, CTS and RTS signals. GSM modem can receive voice calls as well as SMS. The incoming SMS is routed to the LCD through PIC18F4550 using programming through AT commands of GSM modem and C programming of the microcontroller.
New arrival of a message is indicated by sending a signal to the buzzer by PIC18F4550. Sound made by buzzer will be an indication for new message received by GSM modem.
C) LCD interfacing with PIC18F4550:
Liquid Crystal Display is an electronic device for displaying text or characters. We are using 14 pin LCD. 16*2 represents 16 characters and 2 line display. LCD’s are economical and easily programmable and can easily display special and custom characters.
New SMS is given to the LCD display. LCD will show the message which is received over GSM Modem.
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