And with seven more LEDs you can even display 0-255 in binary. [Miguel] is clearly in the latter camp. To make debugging-with-LEDs easy, he’s come up with an 8-LED board complete with resistors.

Most of us learn to read digital clocks first, which display the time in obvious numbers ... you’re ready to learn how to read a binary watch. Then you can build your own, just like [taifur ...