Mounting an Arduino inside a PC

Question

I want to mount an Arduino Pro Micro inside my PC, hooked up to the PC's USB.

I don't want to have external cables for this, but have it neatly cabled inside.

My motherboard has USB connectors with 9 pins (5+5 grid, 10th pin key), like these:

These connectors would take a cable that looks like this:

But how would I connect this to the Arduino that has Micro USB?

I've been looking everywhere, but 9-pin USB to USB Micro does not seem to exist?

The closest I could find is a cable that goes from USB micro to a 5-pin header:

What is the preferred way to hook up an Arduino Micro with internal cabling?

Why does the 9-pin to USB-micro not exist?

Answer 1

@Bram, @jsotola is highlighting in the comments that the example photo you show with a 9 pin keyed two row connector has two usb cables connecting to it. USB connections often have four wires each. The standard wire color coding is:

(Source Wikipedia - USB)

Board manufacturers are often looking for a simple way to connect multiple panel mount USB ports to the PCB and this could have been a cheap and convenient way to connect two USB ports per pcb connector.

Some suggestions:

• Research the specific motherboard online to see if a schematic or connector layout is available. It’s quite likely to be laid out like this:

• Experiment by making your own connector, and use a multimeter to figure out which are the power and which are the data wires.
• If the old USB ports which used to connect to the PCB are still available, investigate further until you’re more confident about how they were wired.
• An adapter may help you experiment further to understand the PCB connections further.

• A micro-USB breakout board may help you experiment with connections on the Arduino side.