Ontology Based Approach to the Detection of Domestics Problems for Independent Senior People
IWINAC '09 Proceedings of the 3rd International Work-Conference on The Interplay Between Natural and Artificial Computation: Part II: Bioinspired Applications in Artificial and Natural Computation
A Wireless Sensor Network for Assisted Living at Home of Elderly People
IWINAC '09 Proceedings of the 3rd International Work-Conference on The Interplay Between Natural and Artificial Computation: Part II: Bioinspired Applications in Artificial and Natural Computation
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Ambient Assisted Living (AAL) systems demand is raising. The use of bed / seat occupancy sensors is imperative for this kind of ubiquitous monitoring systems. Pressure mats are a first way to solve this feature, but several environmental dependencies make them weak to be an efficient and reliable solution for large volume deployments. Solutions based on force-to-resistor transducer seems to imply a too high power consumption to be integrated on wireless sensor nodes. A force-capacitive transducer based sensor has been proposed, implemented and tested in this paper. This sensor, based on Electro-Mechanical Films (EMFi) is able to detect force variations in a quasi-passive way. This detection is used to trigger an active mechanism to measure the weight by means of the transducer capacity. A low-power wireless sensor node prototype including this new sensor has been assembled and tested with a wide range of weights. The occupancy detection was successful and the power consumption of the node was increased at less that a 15%.