I've got a Streamdeck that has a USB 2.0 out as a fixed cable. I've bought a USB C 2.0 board that I want to wire up so I don't have a fixed cable anymore.

My issue is I don't know what the two black cables are, as I assumed red is for power, white is for D-, green is for D+ and black is ground. That's as much as I know when it comes to this sort of stuff and I don't know what the last black cable is for. I've read it's something to do with OTG or something, but how would I then wire that up or would I not need to? Should I just wire it to ground?

Thanks in advance.

USB C 2.0 Breakout Board that I have. Image of the USB C 2.0 Breakout Board that I have.

Streamdeck PCB USB wiring (USB 2.0) Image of the Streamdeck PCB USB wiring (USB 2.0)


closed as off-topic by Chris Stratton, Hearth, JRE, Finbarr, Bimpelrekkie Apr 29 at 9:07

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  • \$\begingroup\$ This type of modification is generally not a good idea. If you are going to do it, then you need to read the documentation, and not just post a picture of some random item you bought from a dubious source. \$\endgroup\$ – Chris Stratton Apr 26 at 17:15
  • 3
    \$\begingroup\$ Both blacks are ground. One is the sheild. \$\endgroup\$ – Tom Carpenter Apr 26 at 17:31
  • \$\begingroup\$ Yes, in-fact you can see one black is thicker than the other wires, that one is the shield braid covered by some heat-shrink. \$\endgroup\$ – Jasen Apr 26 at 23:12

As Tom said, both black wires are grounds. You should be more concerned about correctness of auxiliary pins on the Type-C receptacle, CC1 and CC2 in particular, otherwise it won't work.

Fortunately, the breakout board does already have proper pull-downs, and a proper cross between D+ and D- wires.

enter image description here

So, you are lucky, and your rework should work. I am not sure although if you will be satisfied with thick, stiff, and expensive Type-C cable, which won't hold in the receptacle and fall off under nearly every movement of your device.

  • \$\begingroup\$ USB-C is pretty good, so long as you keep lint (and other crud) out of It. I measured 800 gramme-force pull force on my laptop USB jack. my phone jack once filled with pocket lint I cleared that using using a plastic spike. USB2 to USB-C cables are not fat because they only need the USB2 conductors. USB3 to USB-C are fat like all USB3 cables are. \$\endgroup\$ – Jasen Apr 26 at 23:20

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