Connecting 12V WS2811 RGB LEDs to Arduino Uno & 5V Power Source (Breadboard needed?) I have an Arduino Uno, 12V WS2811 RGB LEDs (from Mokungit), a 5V power source, and DC power connector. I do not have a breadboard and hope I don't need one.

This is almost exactly what I need to follow this tutorial to build a Stranger Things wall. The LED strip listed shares the same name as the one I have, but the wiring is different. 

Here's a photo from the Instructables site:


However, the wires coming from my strip don't match up to the instructions, and I can't seem to figure out how to get these bad boys burning.






Thanks to anyone who can help me get started!
This image, from here, shows which pins are what:



Note the flat key next to the 12 V and GND pins. In addition:


the GND wire has a black broken line printed along it;
the data line is in the middle. 


If you trust the image then you should be able to wire them up correctly.