“…They may be instrumented with accelerometers (Li 2013), piezoelectric sensors (Alwan 2009;Klack et al 2011;Leusmann et al 2011), (capacitive) pressure sensors (Olivier et al 2009;Helal et al 2012;Hoey et al 2011;Stefanov, Bien, and Bang 2004), micro-electro-mechanical systems (MEMS) (Fernandez-Luque et al 2013;Helal et al 2012), or innovative sensors using the near-field imaging principle (reported in Leone, Diraco, and Siciliano 2013), but the solution of a ready-to-be-used pressure-sensitive textile layer (Hanson, Barth, and Silverman 2011;Lauterbach et al 2012), called a presence mat or pressure mat, has been popular since the last years . The same technologies can be used for detecting sofa/bed/chair occupancy (Almudevar et al 2008;Cruz-Sanchez et al 2012;Fernandez-Luque et al 2013;Hilbe et al 2010;Kosse et al 2013;Muñoz et al 2011;Palumbo et al 2014;Suryadevara et al 2013;Raad and Yang 2009;Zhang, Hariz, and Mokhtari 2008).…”