Electrical – Custom wiring a micro camera to a USB

Although your guess about the wiring seems sensible, I would approach it this way:

• Using any make/model numbers on the camera, search online for any technical information on that (or similar) models, which might apply.

  Manufacturers often keep similar connections between models of devices, so a technical manual for model "X" may be helpful with model "Y" from the same manufacturer.

• Open the camera and look on the internal PCB for components (and PCB markings) close to each of those external connections.

  For example, if the two "ACP" connections go to a bridge rectifier and then a 7812 regulator, and the output of that regulator is also the place where the 12V wire connects, then you can confirm that you have identified the AC and 12V power connections.

• In this context, "VBS" usually means a composite video signal (VBS = "Video Baseband Signal" or "Video, Blanking & Syncs"). A single yellow wire for the video output (using the camera's 0V rail for the video signal connector shield) is common, so again, your guess makes sense for this.

• Since this camera was a "skip find" which may not work, then it's difficult for you to tell the difference between:

  (a) Correct wiring, but faulty camera; or
  (b) Incorrect wiring.

  Therefore even if you use the correct wiring, it may not work, of course.

Good luck!

The micro B connector (Strictly speaking, it should be a micro-AB port that can accept a micro-A connector, but I don't know if the RPZ has this) must be wired as an OTG cable for this to work. This requires a "sense" pin in the connector to be tied to the ground (it floats on normal cables). The simplest way would be to use an existing OTG cable (I believe you can actually buy OTG cables with a full-sized B connector on the other end, which wouldn't require any modification) rather than attempt to mess with the wiring inside the plug.