Full disclaimer: I know VERY little about electronics and electrical components. I understand the bare basics of electricity as a concept, but my background is more focused on programming/software development. In other words, if you throw a bunch of electrical engineering jargon at me, it will likely go over my head. Thank you in advance.
I recently purchased 6 Cooler Master Sickleflow 120 ARGB fans for my computer case. After installing, I realized that the RGB control software available was very limited and I wanting to have a wide array of programmable options. So I grabbed my trusty arduino uno, found some simple tutorials online, tweaked some code, and created a functioning RGB light show in my computer case (it looks amazing). The next step in this mini project is to integrate the arduino into my case. Currently, the arduino is powered by my computer via USB, but I would like to have it draw power from either my computer's PSU or my motherboard. This will make cable management less bad and free up a USB port. What is the easiest way to do this? Is there an adapter that I can buy to plug into my PSU to power my arduino? As mentioned, another option might be to draw power from my motherboard to my arduino somehow. Ultimately, the goal is to power my arduino when my computer is turned on in the safest and least dramatic way possible.
My motherboard is a MSI B450 Gaming Pro Carbon Max WiFi and my power supply is a Thermaltake Toughpower Grand Series RGB 750W (modular). If any other specs are needed, I will gladly provide them.