Can I use the Arduino with an External wall-wart and the USB at the same time? I need to power more LEDs, and the USB on my computer can only supply so much. But, I didn't want to destroy my computer because I had the USB and the external plugged in.
I saw this,
But I am still unsure. The reason I want to at all is because when I connected this circuit, the Arduino would cease to be recognized on the USB. I don't know if it is because there wasn't enough power to the LED, if I short-circuited something, or something else. I do not wish to break my laptop though.
These all seem to indicate you don't just "plug in" with both, and you need some other kind of regulator or something. But in that same answer, one person says,
And that indicates when the power is plugged in the USB is cut off. Again, my fear is breaking my laptop, and that is the main question. Especially in light of this,
The external power is this,
9 VDC 1000mA regulated switching power adapter