The ornamental design for a movementsensor, as shown and described.
1. Movement sensor
1.1 : Front
1.2 : Top
1.3 : Perspective
1.4 : Bottom
1.5 : Back
1.6 : Left
1.7 : Right
Reproduction 1.1 is a front view; reproduction 1.2 is a top view; reproduction 1.3 is a perspective view; reproduction 1.4 is a bottom view; reproduction 1.5 is a back view; reproduction 1.6 is a left view; reproduction 1.7 is a rights view.