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Detect the opening or closing of the door with proximity switch

The above is the example, proximity switch and its trigger ( the magnet), mounted on the hinge.The proximity switch is cylindrical and the magnet is round.However, it is important to note that the material of this hinge is not iron or other ferrous metal;When the hinge is close, close to the switch and the magnet, it is necessary to ensure that the center of the proximity switch is not in the magnet position, because it is a magnetic blind area and the proximity switch will not be triggered.However, if using a square magnet, there is no problem.