The processor has been verified as working with a blinking LED. It’s the ‘Hello World’ of computer design, and it’s at least as complex as blinking a LED with an Arduino. You’re gonna ...

As a perfect example, these LED “blinking eyes” were created by ... Thanks to the pseudorandom number generator in the Arduino code, the “eyes” even have a bit of variability to them ...

The USB port is for connecting to your computer to upload the code ... in examples in the Arduino IDE. The most beginner-friendly sketch here is the "Blink," which simply makes an LED blink.