I have learned a lesson that buying items based on a single guide should be priority if your unfamiliar with any of this to begin with. I have an LED PSU with 5v 30a, a RPi 2, and a WS2812B LED strip 5m 60leds. What I have since realized since these things arriving, is that I do not have the 4 contacts on the LEDs, the LEDs I have only have 3. I'm figuring out it seems that I cannot use a RPi 2 the PSU and LEDs only, because of the lack of that extra contact.
TLDR if the base setup I currently have is a led power supply, a RPi 2 v2, and a strip of WS2812B. Than I need an audrino to add into the mix to get it working? Is this correct?