Raspberry Pi 2 B(With OSMC) <-- Arduino Uno R3 <-- WS2801

Hello! I have this problem:
I cannot get my “ambilight Clone” to work with this setup:

Raspberry Pi 2 B with OSMC linked with a usb cable to an Arduino Uno R3.
The arduino is hooked up to a WS2801 LED strip

I have maybe searched to much and gone wrong in all the tutorials, so my prayer is, if someone could help me, maybe with some tutorials that can help me, or something like that.

Thank you for the help!