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Author Topic: Power supply by USB with a regulated voltage source?  (Read 540 times)
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Hi,

I was thinking about cutting a usb cable, put 5V and Ground on an end with a regulated voltage source, and connect the other end to the Arduino USB input. Is that a bad idea? What should I do with the data cables? Connect them to the ground? With a resistor?

Thank you.
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Left Coast, CA (USA)
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Hi,

I was thinking about cutting a usb cable, put 5V and Ground on an end with a regulated voltage source, and connect the other end to the Arduino USB input. Is that a bad idea? What should I do with the data cables? Connect them to the ground? With a resistor?

Thank you.

That should work fine for powering the board. It really doesn't matter what you do with the data signal pins, I would just cut them and let them float. Keep in mind that the maximum +5vdc current avalible to the board will still be limited by the on board USB thermal fuse rated at 500ma.

Lefty
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Ok great, thank you smiley-wink
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 I am going to try a USB power pack that I bought off of Ebay.  Here is the search category for you too consider the options. http://www.ebay.com/sch/i.html?_trksid=p5197.m570.l1313&_nkw=usb+power+pack&_sacat=0&_from=R40
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