In optoelectronics, the use of light emitting diodes
(LEDs) has been of great importance. Now a day LEDbased moving-message displays are becoming popular for
transmitting information to large groups of people quickly.
The control of LED matrix is based PIC18F4520
microcontrollers. This micro controller was programmed
using C language. The number of the microcontroller’s pins
used in controlling the LED matrix was strictly minimized to
three by adopting the serial to parallel mode of signal
transmission. The design of the project was done and simulated
with Proteus software. The LED matrix was constructed on a
vero board. The drive circuitry which consists of the
microcontroller, two ULN2803s, nine 74HC595s and other
peripherals was constructed on a printed circuit board.