I just want to confirm something before I wire up my first ever Arduino project and fry all the stuff I just spent money on.
It is my understanding that the
Vin power input will tolerate a 9V battery and use voltage regulators to pare it down to either 3.3V or 5V (as different parts of the board require). So it is then my assumption that if I have a 9V battery running to
Vin, that I could then connect a power wire to the
3.3V connector, and reliably get a 3.3V signal (and ditto for 5V), yes?
Or, is it that they are input jacks expecting either 3.3V or 5V signals? I guess I'm confused over this:
Vinthen power the 3.3V and 5V inputs, giving me access to voltage at that level; or
- Do I have to choose between 3.3V, 5V or
Vin, and only use one of those to power my board (with the appropriate voltage level)