Parola is a modular scrolling text display using MAX7219 or MAX7221 LED matrix display controllers using Arduino. The display is made up of any number of identical modules that are plugged together to create a wider/longer display.
The aim was to create a 'lego-like' LED matrix display, using standard 8x8 LED matrices. The software supports this flexibility through a scalable approach that only requires the definition of the number of modules to adapt existing software to a new configuration.
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The Parola software has a dependency on the MD_MAX72xx Arduino library which implements hardware functions of the LED matrix. The sketched need to be configured for the type of matrices being used - please refer to the hardware section of documentation for the MD_MAX72xx library.
Additional information also at my blog, search "Parola A to Z".