Blinks a series of 12 LEDs in a continuous loop.
There seems to a general mis-conception that resistors should be connected to the anode of a LED: not true.
This circuit simplifies things with a single resistor (1k is about right for the LEDs I used) on the common cathode part of the circuit. That's fine in this case because we're only going to have one LED on at any time.
- Similar to the Arduino ForLoop example