Heya all, first, I am new to this stuff, so my understanding of the physics that drives all this is extremely limited.
Currently, I have a RGB LED (anode type) hooked up to my Arduino. The cathode is hooked up to the 5V and the anodes for each color in the LED is hooked up to PWNs 3, 5 and 6. (red, green and blue respectively).
Everything works as it should, however, I read up a lot about the need for resistors to prevent the LEDs from burning out.
This here is the anode RGB LEDs I purchased at Seeed Studio (http://www.seeedstudio.com/depot/5mm-triple-output-led-rgb-common-anode-p-25.html?cPath=32_19)
My question is, how do I find out what kind of resistors I need to use? Is there a formula or calculator that I can use to determine this? What if I have multiple RGB LEDs that I want to hook up to my Arduino? (I'd like to hook up around 5 of these RGB LEDs, all performing the same function). I saw this thing called a breadboard, what is it? Do I need that to allow plugging in of more than 1 RGB LEDs?
Anyway, any links to tutorials or high-level diagrams would be much appreciated. Again, I'm new to all of this, and am trying my best to take things one step at a time, any help would be much appreciated.