I received my Rainbowduino last week and am excited to use it. I intend to connect it via USB to upload sketches, then disconnect USB and use a DC adapter to power the device in another room.
What is the purpose of the USB/HOST switch? If I leave it on “USB” but connect a DC power supply to the on-board 2.1mm barrel connector, will that cause trouble?
Lastly, is the tip on the on-board DC barrel connector positive or negative?
Thank you for any help that you can provide,