https://repository.gatech.edu/entities/publication/5125b99b-3fbd-4a6b-b0df-41a7f5c5bf6a
Ubiquitous Self-Powered Ambient Light Sensing Surfaces
Many human activities interfere with ambient light in a predictable and detectable way in that our activities implicitly or explicitly block the paths of...
ambient light sensingubiquitousselfpoweredsurfaces