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I'm building a lamp that has (up to) three wall-mounted units connected to a central control box. Each one gets three low-voltage control signal wires and 12V 3A DC power. I'm figuring that a USB PD cable is going to be best for this, just for convenience, but I'm having trouble finding USB PD panel-mount jacks.

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  • \$\begingroup\$ USB-PD and convenience don't really go together very well. \$\endgroup\$ – Hearth Jul 31 at 17:53
  • \$\begingroup\$ Why isn't USB-PD convenient? What would be a better connector? \$\endgroup\$ – JefftheGreen Jul 31 at 18:55
  • \$\begingroup\$ USB-PD requires a microcontroller on both ends of the link capable of communicating its power requirements. \$\endgroup\$ – Hearth Jul 31 at 19:34
  • \$\begingroup\$ Well, maybe not necessarily a microcontroller, as you could use a dedicated USB-PD negotiation chip, but the fact stands that it's somewhat obnoxious to deal with. \$\endgroup\$ – Hearth Jul 31 at 20:02
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    \$\begingroup\$ @JefftheGreen Don't use USB connectors for things that are not USB. That just invites confusion when a user tries to connect a real USB device (or host). \$\endgroup\$ – duskwuff Jul 31 at 23:23
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If you are making something for your own home office or garage, you can use whatever low-voltage connectors/wires you want, including Type-C connectors.

However, these connectors are designed for high-speed communication with low-profile portable devices in first place, and power delivery is sort-of secondary. As high-speed (10 GHz range) connectors, they typically have 0.5mm pitch and target thin 0.8mm PCBs (half of normal PCB). These parameters are hardly "convenient" to deal with.

More, the Type-c and PD requirements are that initially the connector/port should not have any voltage, and ony if a special signaling over CC wires is detected, the starting voltage is "+5VSAFE", and only after heavy negotiations over PD protocol it is allowed to supply higher voltages.

And I don't want to start about the cost of Type-C cables.

So, for projects like 12-V lamps, it is more convenient to use old-style DIN connectors, like this one, which are better manageable in DIY environment:

enter image description here

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