Week 5

INTRODUCTION

                 Wireless communication has announced its arrival on big stage and the worldis going mobile. The number of people with cell phones is on the rise as we wish to control everything and without moving an inch. This electronic Advertisement Display Board is possible through embedded systems. Various technical arenas in the field of Telecommunication and Embedded Systems have come very near to the common people. The use of embedded system in the communication has given rise to many interesting applications that ensures comfort and safety to human life. Improvements in the Networking technologies have fostered growth of very dense networks. Land line telephones have been becoming less popular and people now prefer communicating while on the move

                 Main function of GSM Based Advertisement Display Board is we can send message to any distant located Advertisement Display Board from any remote area. By interfacing the GSM modem with mobile phone, we can send text message from any remote area.GSM MODEM, SIM, LCD (Liquid Crystal Display), microcontroller, power supply and also some connecting wires are the common peripherals required for developing any GSM based applications.

                Our administrator uses a simple GSM based handset for sending messages to different display stations which are located far away from him. The GSM modem used at the receiver end is used to receive the messages and LCD to display them. As we are using mobile for sending messages, it is easy to handle and operate. As it is a wireless transmission the system has very less errors and maintenance. The sent message is stored in the SIM of the modem. By issuing proper AT commands, it is read from the modem and stored in the microcontroller. In order to reduce the current required for the module and to simplify the hardware and wiring necessary to drive the LEDs this design uses Multiplexing.