For my project I have bought two simple boards with RGB LED's on them (WS2812 based, product description). I already had similar one with single LED that I connected with four wires: Red channel, Blue channel, Green channel and GND. It worked well with simple GPIO.output commands.
This one however has quite strange connections (check the photo. I soldered wires to all available contacts and connected it to Pi. VCC as power to 3,3V, GND as GND and DIN/DOUT to two GPIO pins I tried to set output to. But whatever I do, the LED's won't light up.
EDIT: Just a quick progress update. I tried various stuff to light the LEDs, even using Neopyxel library but so far no luck. I guess this is out of my "knowledge-zone" :-) For now.