Tim Campbell Eric C. Larson Gabe Cohn Ramses Alcaide Shwetak N. Patel WATTR: a method for self-powered wireless sensing of water activity in the home. 169-172 2010 UbiComp http://doi.acm.org/10.1145/1864349.1864378 conf/huc/2010 db/conf/huc/ubicomp2010.html#CampbellLCAP10