The project aims in designing a digital notice board with display on Scrolling LED display using an Android smart phone through Bluetooth. We can implement this technology in schools, colleges, banks etc… After accessing every message, it automatically resets and indicated by LED. Android is a software stack for mobile devices that includes an operating system, middleware and key applications. Android boasts a healthy array of connectivity options, including Wi-Fi, Bluetooth, and wireless data over a cellular connection (for example, GPRS, EDGE (Enhanced Data rates for GSM Evolution) and 3G). Android provides access to a wide range of useful libraries and tools that can be used to build rich applications. Bluetooth is an open standard specification for a radio frequency (RF)-based, short-range connectivity technology that promises to change the face of computing and wireless communication. It is designed to be an inexpensive, wireless networking system for all classes of portable devices, such as laptops, PDAs (personal digital assistants), and mobile phones. The main controlling device of the whole system is an ATMEGA328 Microcontroller. Bluetooth modem and scrolling LED display are interfaced to Microcontroller. The TEXT-based command fed to android smart phone will be transmitted over phone’s Bluetooth. This information will be received by the Bluetooth modem which is connected to microcontroller. Microcontroller will scroll this message on the p10LED display. To perform the task, Microcontroller is loaded with an intelligent program written in embedded ‘C’ language.  

Objectives:

• Design a digital notice board using Bluetooth technology.

   

The main blocks of this project are:

1. SMPS Power Supply.
2. Atmega328 Microcontroller.
3. Scrolling P10 LED display with driver.
4. LED indicators.
5. HC-05 Bluetooth.

   

Software’s used:  

1. Arduino IDE Studio compiler for Embedded C programming.
2. Express SCH for Circuit design.

  Block diagram:

video: