Development of a Bluetooth Based Scrolling Display Using Light Emmitting Diode

This work presents the design and construction of an electronic scrolling digital display system, using Light Emitting Diodes (LEDs). The arrangement of LEDs is inform of dot matrix array on which information is displayed. This work is useful for dissemination of information across various department and faculty within the institution. The system consists of the Power supply unit, control unit (which entails the Microcontroller, counter unit and driver unit) and the Display unit (which is the output unit inform of LEDs). The power supply unit uses alternating current (AC) from the mains which will be optimized to 12 V using a step-down transformer, rectified with bridge rectifier, filtered with an actual capacitor and regulated to 5 V using an ICs regulator. The Microcontroller used was the ATMEGA328P microcontroller, which is a family of 8-bit microcontrollers and has a maximum rated processor frequency of 16 MHz It has a simple voltage requirement of a 4.5-5.5volts from the power source. Also, a 74HC595 Shift register was used in the design for shifting the characters from left to right. The output unit enables the information to be displayed using the light emitting diodes (LEDs) on a 16x32 Dot matrix display