Probably making a stupid mistake, but need someone to point it out to me

Using Arduino General Electronics
5

centizen:

KeithRB:
Where are teh current limiting resistors? Are you accounting for the difference in forward voltage between the different colors of LED's?

Built in, and no, I have no idea what that means. Care to elaborate?

This is the LED I'm using

Clear 'Piranha' Super-flux RGB (tri-color) LED [Common Anode] : ID 314 : $2.00 : Adafruit Industries, Unique & fun DIY electronics and kits

What makes you believe there are current limiting resistors built into the LEDs? I see no evidance of that in the datasheet. http://www.adafruit.com/datasheets/BL-FL7680RGB.pdf

Lefty