Marquee Display

24x8 LED matrix marquee display is implemented around the PIC16F877 with three DS7221 as the LED drivers. Each DS7221 can drive 8x8 matrix therefore three are needed to drive 24 columns. A clock module using DS1307 is also being used and a temperature sensor will also be added later. Soldering the LED matrix consumed a lot of time; it took 15-20 minutes to solder a single column. I had to spend more than a week to finish the soldering. Coding the program is still in early stages. After a couple of revisions I managed to scroll a text massage but still have to go a long way.

Matrix - Front

Matrix - Back

Final product - Component side

Final product - Wire side

Marquee in action