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Battery-powered sensors require user maintenance, preventing practical ubiquitous sensor deployment. We present OptoSense, a general-purpose self-powered sensing system which senses ambient light at the surface level of everyday objects as a high-fidelity signal to infer user activities and interactions. To situate the novelty of OptoSense among prior work and highlight the generalizability of the approach, we propose a design framework of ambient light sensing surfaces, enabling implicit activity sensing and explicit interactions in a wide range of use cases with varying sensing dimensions (0D, 1D, 2D), fields of view (wide, narrow), and perspectives (egocentric, allocentric). OptoSense supports this framework through example applications ranging from object use and indoor traffic detection, to liquid sensing and multitouch input. Additionally, the system can achieve high detection accuracy while being self-powered by ambient light. On-going improvements that replace Optosense's silicon-based sensors with organic semiconductors (OSCs) enable devices that are ultra-thin, flexible, and cost effective to scale.<\/jats:p>","DOI":"10.1145\/3411826","type":"journal-article","created":{"date-parts":[[2020,9,4]],"date-time":"2020-09-04T21:39:45Z","timestamp":1599255585000},"page":"1-27","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":28,"title":["OptoSense"],"prefix":"10.1145","volume":"4","author":[{"given":"Dingtian","family":"Zhang","sequence":"first","affiliation":[{"name":"Georgia Institute of Technology, Atlanta, Georgia"}]},{"given":"Jung Wook","family":"Park","sequence":"additional","affiliation":[{"name":"Georgia Institute of Technology, Atlanta, Georgia"}]},{"given":"Yang","family":"Zhang","sequence":"additional","affiliation":[{"name":"Carnegie Mellon University, Pittsburgh, Pennsylvania"}]},{"given":"Yuhui","family":"Zhao","sequence":"additional","affiliation":[{"name":"Georgia Institute of Technology, Atlanta, Georgia"}]},{"given":"Yiyang","family":"Wang","sequence":"additional","affiliation":[{"name":"Georgia Institute of Technology, Atlanta, Georgia"}]},{"given":"Yunzhi","family":"Li","sequence":"additional","affiliation":[{"name":"Georgia Institute of Technology, Atlanta, Georgia"}]},{"given":"Tanvi","family":"Bhagwat","sequence":"additional","affiliation":[{"name":"Georgia Institute of Technology, Atlanta, Georgia"}]},{"given":"Wen-Fang","family":"Chou","sequence":"additional","affiliation":[{"name":"Georgia Institute of Technology, Atlanta, Georgia"}]},{"given":"Xiaojia","family":"Jia","sequence":"additional","affiliation":[{"name":"Georgia Institute of Technology, Atlanta, Georgia"}]},{"given":"Bernard","family":"Kippelen","sequence":"additional","affiliation":[{"name":"Georgia Institute of Technology, Atlanta, Georgia"}]},{"given":"Canek","family":"Fuentes-Hernandez","sequence":"additional","affiliation":[{"name":"Georgia Institute of Technology, Atlanta, Georgia"}]},{"given":"Thad","family":"Starner","sequence":"additional","affiliation":[{"name":"Georgia Institute of Technology, Atlanta, Georgia"}]},{"given":"Gregory D.","family":"Abowd","sequence":"additional","affiliation":[{"name":"Georgia Institute of Technology, Atlanta, Georgia"}]}],"member":"320","published-online":{"date-parts":[[2020,9,4]]},"reference":[{"key":"e_1_2_2_1_1","doi-asserted-by":"crossref","unstructured":"Michelle Annett Tovi Grossman Daniel Wigdor and George Fitzmaurice. 2011. 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