Instead, [Ivan] decided to drive it directly from an Arduino Uno ... use of available RAM and flash. The code is available on Github. If you need inspiration for your own controllerless LCD ...

[Usmar A. Padow] put together an Arduino Uno, SD card, four line character LCD, and PS/2 keyboard. but he’s also included alternative options to go without an LCD screen by using a computer ...

The Uno Rev3 ... the Arduino sketch is pretty straightforward with less than 100 lines. So if you want to modify it to add more fans, change the message on the LCD, or use a different temperature ...