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servo controllers

Help point me in the right direction, servo controllers

I need some electronic circuitry help.  I'm building a door.  The door is going to be controlled by one servo.  I am trying to get it so that by pressing one button it goes to the open position and by pressing another button it goes to the close position.  How would I go about doing this?  I've been reading up like crazy about lm555 circuits and controllers but I just don't know how to apply that, if it's even possible.