| 摘要 |
A plurality of conductive members is disposed on an edge of a moveable barrier. The edge has a width and each of the conductive members is disposed along a portion of the width. A controller is coupled to each of the plurality of conductive members and is programmed to determine whether an obstruction exists within a path of movement of the barrier by analyzing a first capacitance sensed by a first of the plurality of conductive members and ground and a second capacitance sensed by a second of the plurality of conductive members and ground.
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