Creation of a Scrolling Display Using a Light Emitting Diode and Bluetooth

Abstract

In this work, an electronic scrolling digital display system built with Light Emitting Diodes (LEDs) is designed and constructed. The LED arrangement is based on a dot matrix array, which is used to show data. Information sharing throughout the institution's faculty and departments is aided by this work. The power supply, control unit (which includes the microcontroller, counter, and driver units), and display unit (which is the LED output unit) make up the system. The AC used by the power supply unit is derived from the mains and is optimized to 12 V via the use of a step-down transformer. It is then rectified using a bridge rectifier, filtered using an actual capacitor, and regulated to 5 V via an IC regulator. The ATMEGA328P microprocessor, a family of 8-bit microcontrollers with a maximum rated processor frequency of 16 MHz, was the microcontroller that was used. Its minimal voltage needs from the power supply are between 4.5 and 5.5 volts. Additionally, the design made use of a 74HC595 Shift register to move the characters from left to right. The output device makes it possible for the data to be shown on a 16x32 Dot matrix display utilizing light emitting diodes (LEDs).