He used an Arduino Mega and Adafruit Neopixel library combo to add and control the animations. To see steps in detail, check out the Instructable below. It seems worth a shot if you've got the skills.

This project is powered by Arduino, a very popular open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It’s intended for artists, designers ...

With your breadboard connected to the Arduino and the power supply plugged into an outlet, plug the Arduino back into the computer with the USB cable. Next, run the Processing code we compiled ...

You can even install the library through the Arduino IDE, just open the Library Manager and search for “Digital Rain” to get started.

Installing the library is as easy as checking out the code from GitHub into your Arduino install, so that’s exactly what I did. I then spent a couple days playing around with it.