= 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)]]