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Many sensors are currently available at prices lower than USD 100 and cover a wide range of biological signals: motion, muscle activity, heart rate, etc. Such low-cost sensors have metrological features allowing them to be used in everyday life and clinical applications, where gold-standard material is both too expensive and time-consuming to be used. The selected papers present current applications of low-cost sensors in domains such as physiotherapy, rehabilitation, and affective technologies. The results cover various aspects of low-cost sensor technology from hardware design to software optimization.

inertial sensor --- gait --- validity --- functional calibration --- accuracy --- wearable electronic devices --- kinematics --- head rotation --- ecological research --- gait analysis --- characterization --- smart insole --- vertical ground reaction forces --- force sensitive resistors --- piezoelectric sensors --- sensor calibration --- heart rate --- photoplethysmography --- PPG --- time-domain --- wearable device --- concurrent validity --- outcome assessment --- feasibility --- rehabilitation --- data fusion --- MARG --- IMU --- eye tracker --- self-contained --- head motion measurement --- motor variability --- actigraphy --- triaxial accelerometers --- jumping --- human-computer interaction --- affective technologies --- interaction design --- biosensing --- actuation --- somaesthetics --- design toolkits --- serious videogames --- motion capture --- upper limbs --- physical rehabilitation --- telerehabilitation --- inertial sensors --- inertial measurement unit (IMU) --- state of the art --- inertial sensor measurement systems --- motion accuracy --- Baduanjin --- physical education --- physiotherapy --- e-health --- motion sensing --- wireless charging --- wireless connectivity --- low power --- trunk --- upper extremity --- compensation --- reaching --- Kinect --- video motion capture --- reliability --- n/a