Design and Implementation of a Microprocessor 8085-based Wireless Notice Board using GSM Technology.

The dissemination of information in public spaces such as educational institutions, railway stations, and hospitals has traditionally relied on manual updates of physical notice boards, a process fraught with latency, logistical overhead, and human error. This article explores the development of an automated, wireless system utilizing the Intel 8085 microprocessor to control a digital notice board via Global System for Mobile Communications (GSM) technology. The system enables users to update information remotely by sending Short Message Service (SMS) commands from any authorized cellular device. By interfacing the 8085 microprocessor with a GSM modem and a Liquid Crystal Display (LCD) through the 8255 Programmable Peripheral Interface (PPI), this research demonstrates a cost-effective and reliable method for real-time information broadcasting. The study provides a rigorous analysis of assembly language protocols, software-based serial synchronization ("bit-banging"), hardware signal conditioning for voltage level translation, and the pedagogical impact of utilizing 8-bit architecture for modern communication solutions. Furthermore, it evaluates the scalability of such systems in remote areas where internet connectivity is sparse but cellular infrastructure remains robust and accessible, ultimately proposing a model for decentralized information equity.