Hey! My Arduino Nano is in the post right now. I'm planning to build a low-power DSP around it. Part of this involves biasing the input signal, requiring a 5V source. For the moment, the Nano is going to be USB only. What's the best way of sourcing this 5V without soldering a lead from the bottom of the USB connector on the Arduino? Could just putting an IO pin high do it? Possibly a waste of an IO pin but if it's the easiest way to get a clean 5V without modifying the board...
Use the 5V pin?
Oh - the way I read the overview, that was an input for the IC that bypassed the regulator:
Vin->Regulator->5V->Atmel
So I can just take that pin as a regulated 5V out? Thanks!
When I power Arduino from USB, I get a little less than 5V (around 4.7V if memory serves me right). When I power Arduino from an external supply, the 5V pin gives almost exactly 5V. So if accuracy is important for your application, you may need to check it out.