Hello and thanks a lot Jan and Tim!!! Hopefully someone can help me with some code similar to what I need ... I don't have time to learn to program well in Java, to combine and to modify some codes. After school, I work until late at night ... This is something normal in Romania. My school require 5mm LED array with 1 cm distance between LEDs, custom made with hi-bright general purpose clear LEDs. The matrix from Sure have 3mm LEDs.Thank you again!