Hello Sterretje,
I don't get it. Besides the USB port to power the Nano, i thought it was possible to put 12v on the Vin port to feed this to the digital ports. When the Nano is connected to a USB powersource, it's works for more than a hour already.
How should it work with level fets or transistors?
The leds can only work on 12v, and the Nano board on 5v.
Thanks,
Edward