RGB LED fans/strip 12v for pc case

Using Arduino LEDs and Multiplexing
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Good day all, this may well be the wrong category for this but hay.
I'm building a pcb for a pc 12v rgb case fan / strip project, now I'm using a arduino nano, witch is going to be connected to an internal usb header on the motherboard, tip120, 220k risters, and a sata/molex power socket for my project.
I have some diodes to, I forget what they are off the top of my head, I got the part from amazon.
Link to kit for detais of parts.

Now I've had this running fine built on a breadboard using a 12v 1a power supply, my question is, is there a way to reinforced the circuit for better long turm use and protection of the PCs psu and the rgb fans / strips.

Refrnce image for a base look at the project
download

Now I plan on adding the diodes to ground an output to protect the tip120's, I want to knoow if there is more I can do to protect my pc and my project for longer lifespan.

FYI I plan on buildings a prototype first then get a pcb printed at a later date to clean up the project, I may also add a 5v rgb led to the board as an indicator, or do some redesigns to have the at atmega328p chip built into the board, but this would also required the usb interface too.

Any help or advice would be appreciated :pray:

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As the section you've posted in is for Covid-19 related projects, I'd say your guess would be right.

Maybe better in the LEDs or Motors section.

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Moved as suggested :+1:

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would it not be easier to use a buck converter to dial down 12v voltage to 5v?

pretty cheap devices, possibly cheaper than using those 120s

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No, as the existing lights are 12v, so this is five rgb fan and two rgb light strip, which both are running off the motherboard currently, however the motherboards controller only allows for single colour selection and no lighting patterns.

The point of my project is to allow me to code any pattern I want, which I've already started playing with.

As for the buck converter, I do have one kicking about, but wanted to build a circuit, rather than conbble together a load of other boards.

Also the arduino nano is pulling it's power off the usb, I had thought about pulling the power from the rgb header itself, but thought its probably best to just use a 12v sata/molex rail instead.

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