GSM based Mutiuser E-Notice Board using Wireless Technology

Abstract

Wireless technology is now taking over the entire world. It has helped in shrinking the world. GSM technology is the most popular wireless technology which is now fastest growing technology in the electronic industry. Advancement in technology has brought about digitization to the core. Even the billing system, attendance system, health monitoring, etc., have all got digitized and so are the advertisement boards and the announcement boards. The existing system is based on programmed display boards. It displays a single message which can be reprogrammed to display another message. This paper explains about the announcement system using the GSM technology using which we can display any message from any part of the world irrespective of the number of messages. This announcement system uses a scrolling LED display which replaces the existing LCD based announcement systems.

Keywords: GSM, SIM, AT commands, microcontroller, shift register, MAX 232, LED,flash, EPROM, RAM, PCB design, CMOS, timers, counters