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What are they for? What are some good uses... List as many as you can....

 

I have one I/o pin going to a relay dpdt http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=843649 i then determines forwards or reverse. Then a second I/0 line to a NPN transitor to turn the motor of or on. This would have the capability of just forwards reverse and off. This is good because it takes on two i/o lines and is able to have just those parts because the coil would be able to run of the  40 mA the arduino pin can source

I recently started to play a game on my xbox. It requires me to pull the left trigger very very fast. The trigger is ran off a potentiometer.  The controller "fires" at a certain point. I need to make a circuit that can do a pretend pull repeadatly. So it has to be an ajustable voltage that can repeadtly go when I press a button for a couple seconds. So it can be sometime of resonator or something. I am not sure how I could make something that fire the potentiometer to fake a couple "fires". I will get more information later when i open up the controller.