Scrolling LED Display

A 5x7 matrix LED Display board with 8051 microcontroller has been designed. The LED’s are connected like a matrix with 7 rows of 5 LED’s per each row is designed on a board to display. For a 5x7 LED matrix, it is impractical to assign one I/O pin per LED, as a 5x7 matrix requires 35 I/O pins. These characters are switched continuously with a delay of 05msec. This design can be extended to number of units by using shift registers to display a message consisting of many numbers of characters. By controlling the data bits connected to the LED’s, we can display any character. The 5x7 LED matrix display with 35 LED’s are arranged in 7 rows and 5 columns structure. The program required for displaying character ‘A’, ‘B’, ‘C’, etc. on the LED matrix, with a delay between each character display has been developed in software keil uvision4. The program code is written in to the keil uvision4 and burn into AT89c51 microcontroller and is verified by interfacing the microcontroller pins for any given character, a corresponding pattern of LED is generated and is used to display the character at run time. The application and advantages that can be used at public transport places like bus stop, railway station, and airport.