Thank you. I just added a LED on Pin 3 - but without a resistor. It works fine though it shines very bright. :o
And eventually it will burn out, unless you have a LED with a built-in resistor.
I've got a 220 Ohm resistor. But it doesn't look like the one you posted in the link (brown-red-black on a light brown resisitor). My resistor is kinda blue with black stripes. But it says it's 220 Ohm. What besides the color are the differences between the two?
There is an international color code for resistors. It doesn't sound like what you have is 220 Ohms. Here is the wikipedia site for the color code: http://en.wikipedia.org/wiki/Electronic_color_code
You can also get smartphone apps that have the color code chart. I keep hoping some day there will be a usable app for Android phones that can use the camera and tell you what the bands say, as I have some amount of color blindness, and I have a hard time telling some colors apart (typically orange and brown).
Does the orientation of the resistor matter?
For resistors, it does not matter. It does matter for LEDs.