The thing about Arduino's I/O pins is that they come with special functions (and corresponding limitations) that beginners are generally unaware of. For instance, in the Uno board, pins D0 and D1 ...

Arduino no longer produces this board. Unfortunately, the more popular boards like the Uno, classic Nano, and Mega 2560 don't support the Debugger feature as they're powered by an AVR microcontroller.

What color do you like your microcontroller boards? Blue? Red? Maybe white or black? Sadly, all of those are about to look ...