= Visible Light based Activity Sensing using Ceiling Photosensors = == Introduction == == System Overview == 2.Synchronization and Signaling == Implementation == 3.1 Prototype 3.2 Experimental Setup == Preliminary Results == 4.1 Location Differentiation 4.2 Detecting Open Doors == Conclusion and Future Work == [[TOC(Other/Summer/2016*, depth=2)]]