For some time, I have been thinking of creating a bigger display. After all, a 5x5 LED matrix is too small. So I have decided to start working on a 20x10 LED display. The code will be similar, but a few additions will be needed. I will post schematic (although it will be very similar) and code.
I have also just finished a library for the Arduino Pi. It is in the github repository under ArduinoPi folder. This can be used to control the ArduinoPi better. Also, I want to design and create an operating system so this library will simplify the creation of such an operating system.