Found this handy for preventing a Smoothieboard from being powered over USB. Off means off! Used heat shrink tubing for a case. It would be cool to have a real enclosure as well as a version that goes on the other end of the USB cable.
Only tried with 100 LED's, but that works as expected. Could not get it to work with my USB-C port on my macbook using an USB-C to USB adapter.
Response from Maniacal Labs | Sept. 27, 2017
We're always here to help if you need a hand getting it working with your hardware. We've not heard of any issues with USB-C adapters but we of course can't try every possible hardware. If you'd like to dig into it further, please send us a message on the Maniacal Labs User Group (http://forum.maniacallabs.com) and we'll work through the issue with you.
I'm running a Pi 2 connected to the AllPixel board driving a set of 300 WS2812B LEDs to create light patterns to music. This uses the lightshowpi code with modifications for bibliopixel. Documentation was fairly complete for coding, but other technical questions were found in the forum. Shipping was completed within a week. I had no issues getting it running. I have some basic soldering skills, so that part was not difficult for me, and is not particularly involved. It is possible to drive updates to the board faster than it can handle, at least according to my testing, but it does extremely fast refresh rates. I was so pleased with it that I created a video explaining what I did.