I am wondering if a component such as a motor exists which can be limited in terms of how far it rotates. In the diagram, the orange is the pivot point and the black is the piece that the motor would move as shown by the arrows. It is the top view of the component. For example if i wanted the black piece to only rotate 90 degrees before stopping and then goes the opposite direction once the current is re-applied. Also it would be activated by one signal and that would cause one rotation. Then another signal created from for example a button being pushed, causes the black handle to rotate back to the original position. Thanks!!