I would appreciate input on this situation:

I plan to power a fairly high current, 5 volt supply, 3.3v signal, device from a suitable wall wart. I would like to power the due that controls it through the due's usb port by tapping the 5v from the wall wart into a suitably modified USB cable (leaving the signal pins unused). No significant external power demands would be made on the due's 3.3v or 5v headers.

So there are two devices sharing the wall wart: one device that uses high current, and the other device is the due.

  • I'm not sure I get you, but maybe V reg? – Dat Ha Nov 15 '16 at 1:56
  • Could you please rephrase your question? – sa_leinad Nov 15 '16 at 2:41
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    If your question is: can I power an Arduino Due with a 5V DC adapter directly from the wall socket? Then the answer is yes. As long as your device (that requires "a fairly high current") is not powered by the Due, but also separately by the adapter. – Len Nov 15 '16 at 10:17
  • Is the device that uses "farly high current" something like an electric motor?-or something that is like an inductor? – Dat Han Bag Nov 15 '16 at 22:05
  • You may want to create a drawing. Powering the Arduino and "device" with the same wall wart isn't all too uncommon. As long as the wall wart can provide enough current for both. And the other device doesn't feed back voltage (like an inductor may), if so you'll want to add a diode. And you may use capacitor(s) to provide decoupling. – Paul Nov 16 '16 at 16:56

Yes it is possible. You just need to connect both Grounds

  • I'm going to decline the "not an answer" and other flags on this question. It looks like an answer, even if it is brief. If you want, vote it down or comment on it. Thanks! – Nick Gammon Nov 17 '16 at 20:58

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