The ornamental design for a dustmitecontroller, as shown and described.
1. Dust mite controller
1.1 : Front
1.2 : Back
1.3 : Left
1.4 : Right
1.5 : Top
1.6 : Bottom
1.7 : Perspective
1.1 is a front elevation view of a dust mite controller showing our new design; 1.2 is a back elevation view thereof; 1.3 is a left side elevation view thereof; 1.4 is a right plan view thereof; 1.5 is a top plan view thereof; 1.6 is a bottom plan view thereof; and 1.7 is a perspective view thereof; besides, the dust mite controller incorporating the new design is mainly used for killing mites, vacuuming, etc.