Just about to start using Uno pins 0 and 1 for serial comms for the first time: so far I've only ever used Serial with the USB, and I'm bit confused.
Do I need to do anything to configure the pins?- do they need a PinMode for example? Here's why I ask: my understanding is that the built-in Rx and Tx LEDs indicate the status of those two pins, yet when I load a sketch like BareMinimum, the pins are both at 5v although the built-in LEDs are off. That doesn't seem right, and I can't imagine why a receive pin would be high anyway when it's not active. If I put an LED from either pin to ground it lights up: but I thought the Tx and Rx built-in LEDs were exactly that, and they're both off.
So clearly either I'm not understanding something and / or my Uno has a glitch. I'm in no hurry so I'm going to await clarity before I hook anything to the Uno Rx pin and pop something.
As an aside, I'm confused also by the directions of the arrows on the board art: strikes me that a Rx pin should have an arrow pointing to the pin, not away?