ONLINE ACTIVITY MATCHING USING WIRELESS SENSOR NODES Topics: Ambient Intelligence; Mobile Computing; Pervasive Embedded Networks; Sensors and Sensor Networks; Ubiquitous Computing Systems and Services In Proceedings of the 1st International Conference on Pervasive and Embedded Computing and Communication Systems PECCS - Volume 1, 22-31, 2011 , Vilamoura, Algarve, Portugal