I have an Arduino Due. It communicate to the computer with the native usb port. It is also powered by the native port. Anyway, the connected sensors are pretty sensitive to the current, thus I would like to use a power supply (as a portable smartphone charger) in order to provide the current at the Arduino.
How can I say to the Arduino to get the current from another 'port' (e.g. the serial programming) and use the native port only for the communications?