I’ve got a question about the USB adapter for the Arduino mini.
I’ve noticed that regardless of which jumper setting I have for the power (Ext/USB), that if I plug in my USB cable it fires everything up.
I want to power it externally and just use the USB for downloading code. I’m afraid I’m going to fry something if I set it to Ext and jack it in with external power also applied.
Any advice for a newbie to Arduino USB adapter?