GSM Based Electronic Notice Board

Abstract

Notice boards are primary tools in institutions, organizations, or public utility places like banks, bus stops, hospitals, or parks. This paper presents an idea for a wireless Digital Notice Board using GSM technology, which can help reduce paperwork and save time. The main objective of this project is to develop a wireless notice board that displays messages sent from a user's mobile phone. Its operation is based on a microcontroller (Arduino) programmed in assembly language. A SIM900 GSM modem with a SIM card is interfaced to the ports of the microcontroller with the help of a regulated power supply. When a user sends an SMS via a registered mobile phone number, it is received by the SIM900 GSM module at the other end. The message is then fetched into the microcontroller, processed, and displayed on an LCD screen. This project has been further developed by providing a message storage facility through non-volatile memory (EEPROM) attached to the microcontroller for retrieval of old messages if required. It can also be expanded to include a bigger LCD screen.