Abstract
The main feature of any public space, including bus stops, train stations, and parks, is a notice board. But daily notice sticking is a somewhat challenging procedure. This notices display needs to be managed by a different individual. This idea is focused on a wireless notice board with cutting-edge technologies. The project's primary goal is to create a wireless digital notice board that can display notices when a message is transmitted from a user's mobile device. While the user sends a message from their mobile device, any smart-phone, tablet, etc. running the Android operating system can perform a remote operation using voice commands and a GUI (Graphical User Interface). Using an Android application-based device remote, transmitting ends transmits commands. These directives are converted at the receiver end into texts that are displayed on a 20X4 LCD that is interfaced to the micro-controller. A Bluetooth receiver connected to the micro-controller receives serial communication data sent by the Android-based application. The microcontroller's programme uses the received data to display the data on a 20X4 LCD. 230/12V step-down transformer power supply, which lowers voltage to 12V AC. In order to convert this to DC, a bridge rectifier is used. A capacitor is used to reduce ripples, and the voltage is then controlled to +5V (volts), which is necessary for the operation of the micro-controller, using a voltage regulator 7805.
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