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Originally Posted by 6600gt
you will need a sensor(preferably a pot) to monitor the position of the cannon and then you have to set it up to be basicly controlled like a servo but with smoother motion because you don't want to damage the mechanisms. Basicly lower the power to the motor as the error gets smaller
error = where you want to be - where you are
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Straight proportional control is by no means the only possibility.