I built an RGB controller with Arduino – Miloš Švaňa
Hacker News
February 28, 2026
Before Christmas, I bought a new computer case. It came with three built-in RGB fans. Unfortunately, the fans use a 3-pin aRGB connection, while my now quite old motherboard has a 4-pin RGB header. I am sure that I could find an adapter that would solve this issue right away. But there is no fun in that. Having experimented with Arduino for some time, now was the time to use my skills to build something useful.
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Originally published on Hacker News on 2/28/2026