Wireless Notice Board Using Bluetooth

Abstract

In modern digital environments, traditional notice boards are inefficient due to manual updating and limited accessibility. This paper presents a Wireless Electronic Notice Board System that allows users to update messages wirelessly via voice commands using a mobile application. The system integrates Bluetooth communication, voice-to-text conversion, and microcontroller-controlled message display, making it suitable for educational institutions, offices, public facilities, and information centers.

Users speak the message into the AMR Voice Android application, which converts speech into text using Google’s speech recognition technology. The text is transmitted via an HC-05 Bluetooth module to an Arduino UNO microcontroller, which displays the message on a 16×2 LCD. For messages exceeding the display area, an auto-scrolling feature ensures full readability.

The proposed system is low-cost, efficient, and user-friendly, offering hands-free operation while reducing manual effort and paper usage. It demonstrates the potential for smart communication tools that bridge traditional methods with modern embedded and wireless technologies.