Wall Plotter Question

Hi All

I'm New Here, i want to build a wall plotter and i found this project:

https://github.com/tinkerlog/Kritzler

but i can't understand what to do with these files...

Please help

Under "Firmware" you will find the .pde file (pre-V1.0 Arduino sketch) to load into the Arduino.

Under "src" you will find the Java program that runs on the PC to control the plotter.