The program code is made with the AVR-BASCOM compiler. There is a program for the ATTiny2313, which can show several moving messages on the sign.
There is also a program that is made for the ATMega8 which is more extensive, with this program you can enter a text with maximum 40 characters in a variable in the program, which is shown on the display. It has also a bigger character set. Below you can download the software code