Documento de conferencia

Low-power bed / seat occupancy sensor based on EMFi

Book Series cp
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
  • Volumen: 6686 LNCS
  • Número: PART 1
  • Fecha: 27 mayo 2011
  • Páginas: 501-510
  • ISSN: 03029743 16113349
  • ISBN: 9783642213434
  • Tipo de fuente: Serie de libros
  • DOI: 10.1007/978-3-642-21344-1_52
  • Tipo de documento: Documento de conferencia
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%. © 2011 Springer-Verlag Berlin Heidelberg.

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