Project Hub /3D Printing & Fabrication/CNC & Laser Cutting Projects/Bluetooth Based Smart Public Announcement Board

Intermediate

ARDUINO

Project Specific

3 – 6 Hours

Partial Kit

Bluetooth Based Smart Public Announcement Board

Build a Bluetooth-enabled smart public announcement board that can be easily updated via text messages sent from any smartphone.

Originally published on ElectronicsForU

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

Arduino Nano C Type V3 ATMEGA328 with Soldered Headers Rs. 608.00
ESP32 WiFi+Bluetooth CP2102 Development Board Rs. 520.00
MAX7219-4 Dot Matrix LED Display Module – 4-in-1 Cascaded Panel Rs. 698.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

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How It Works

The Bluetooth Based Smart Public Announcement Board allows users to wirelessly transmit text messages from a smartphone to a bright visual display. At the heart of the system is an Arduino microcontroller (compatible with the UNO, Nano, or Mini), which manages both incoming wireless data and visual output. A smartphone running a standard Bluetooth terminal app pairs with the HC-05 Bluetooth module wired to the Arduino. When you type and send a message via Bluetooth, the HC-05 receives the serial data stream and passes it to the microcontroller using serial communication libraries like SoftwareSerial. The Arduino processes these incoming characters and translates them into graphical patterns. Using the LEDMatrixDriver library, the microcontroller drives the LED Matrix display, scrolling or flashing your custom text message across the grid of lights in real time. A stable external power supply ensures both the microcontroller and the power-hungry LED matrix receive adequate current for bright, clear operation.

Why Build This

Design a practical, wireless digital notice board that can be updated instantly from a smartphone for school corridors or classroom announcements.

Gain hands-on experience combining wireless communication modules with custom visual output displays.

Learn how to program microcontrollers to parse incoming serial data strings and convert them into dynamic visual text on an LED matrix.

Real-World Application

Public announcement systems in schools, offices, colleges, railway platforms, and commercial spaces for real-time digital messaging.

Skills You'll Learn

Wireless serial communication

UART protocol configuration

LED matrix multiplexing

string manipulation in embedded software

power management for digital displays

Safety Precautions

Flagged during content review — not in the original source

Ensure your external power supply matches the voltage and current requirements of the LED matrix and Arduino to prevent overheating or component damage, and always double-check your wiring before connecting power.

Technology Tags

ARDUINO

BLUETOOTH

HC-05

LED MATRIX

WIRELESS COMMUNICATION

SMARTPHONE INTEGRATION

Frequently Asked Questions

Which Arduino boards can I use for this project?

You can use an Arduino UNO, Nano, or Pro Mini, provided it has enough pins and memory to handle the SoftwareSerial and LEDMatrixDriver libraries.

Do I need a special app on my phone to send messages?

Yes, you will need any standard Bluetooth terminal app available on your smartphone's app store to connect to the HC-05 module and transmit text messages.

Can I power the LED matrix directly from the Arduino's 5V pin?

It is generally recommended to use a separate, stable external power supply for the LED matrix to avoid drawing too much current through the Arduino board, which can cause resets or component damage.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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