You could put the Arduino in deep sleep, if you wanted to and that LED will still blink. With a little work, you could probably adapt this idea to any number of circuits out of the 555 playbook ...

Snap Programming Last Updated: 7/27/18 This Arduino module takes past circuits and codes, and applies them to a new program called Snap4Arduino. Snap4Arduino allows us to program an Arduino board in ...

Many programmers stay within a graphical language when they're developing applications. But graphical- and text-based programming are much more complementary than most developers realize.