[originally posted on todbot blog] You may not have known, but blink(1) USB notification LEDs have a secret: they can drive 16 extra LEDs in the form of "NeoPixel" WS2812 LEDs. This is what was behind the "blink(16)" project.
If you take apart a blink(1), you'll see it has three tiny plated holes. These are the three needed by WS2812 LEDs: +5V, Gnd, and Data.
Or, in diagram form against a standard WS2812B strip:
Taking apart a blink(1) to wire it up for extra LEDs isn't too difficult if you're okay with a bit of soldering. Here's videos showing two different ways to do it: