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[on:]

I'm working on my first project with arduino, and I just need to know if I can connect the arduino to a wall adapter and a computer at the same time.  Will they both be supplying power (i.e. overpowering the arduino)?  I ask because I plan to send data to the arduino from my computer as my computer reads bluetooth from my phone (still haven't figured out how to do that yet), but then use that info to power a little DC motor via a transistor.  I don't get the 5V needed for the transistor from just my computer, but I can with the wall adapter.  So will connecting them both at the same time fry my arduino?  (Wall adapter is regulated 9V, 1A)

[Reply #1 on:]

Yes you can power the arduion from an wall wart via the phone jack or the Vin pin PROVIDED that you keep with in the voltage limits for your card (check the hardware section of the web site).

For a very small motor via a transistor you can use Vin or V5v and both will work.

See http://www.oomlout.com/oom.php/products/ardx/circ-03

Mark

[Reply #2 on:]

you keep with in the voltage limits for your card (check the hardware section of the web site).
For a very small motor via a transistor you can use Vin or V5v and both will work.

arduino is 3.3 or 5 volts, neither apply to a 9 volt wall wart ... why even include that when talking to a noob clearly stating what they have? cause applying 9 volts to the 5v pins will NOT work, unless your making a smoke generator.

to the op, use the power jack, it wont fry anything to have both external and USB plugged in

[Reply #3 on:]

Thanks, that's what I wanted to know.