Thanks for the reply! I have a few questions just to clarify!
Towards the end they suddenly mention an Atmega328. What is the point of this? I don't understand it, just seems to complicate the overall project.
Why can't I plug the 12V 3A PSU directly into the Arduino then run that power out the Vin plug? It says an Arduino Uno is capable of handling 12V with an absolute max of 20V.
Why are there resistors before each transistor and what value should they be? Do the transistors "know" the proper current to supply when activated or do I program that? I want to make sure I don't blow my lights out!! Also will I need transistors that can handle 3A each? Do those exist? I can't find any!
If I go with a 12V PSU, I calculate I will need the following resistors:
Red - 490 so 510
Blue - 430 so 470
Green - 435 so 470
Since those aren't standard resistances I would round to the second number because you always want to play it safe and go to the closest value above the calculation right?
And last, on the diagrams on that post I don't see how to wire the anodes for the LEDs. The color strips are accounted for but how would I connect them all to the power supply? Just hook them all right up in series or parallel with the Vin output??
The LEDs I'm using are:
http://www.noodlehed.com/ebay/datasheets/HH-1000CRGBW810.pdf