Recent Submissions

  • A novel low-cost smart leaf wetness sensor 

    Hornero Ocaña, Gemma; Gaitán Pitre, Jorge Eliécer; Serrano Finetti, Roberto Ernesto; Casas Piedrafita, Óscar; Pallàs Areny, Ramon (2017-12-01)
    Article
    Open Access
  • Solar energy radiation measurement with a low–power solar energy harvester 

    López Lapeña, Oscar; Pallàs Areny, Ramon (2018-08-01)
    Article
    Open Access
    Solar energy radiation measurements are essential in precision agriculture and forest monitoring and can be readily performed by attaching commercial pyranometers to autonomous sensor nodes. However this solution significantly ...
  • Time-Division Multiplexing Control of Multi-Input Converters for Low-Power Solar Energy Harvesters 

    López Lapeña, Oscar (Institute of Electrical and Electronics Engineers (IEEE), 2018-03-29)
    Article
    Open Access
    Many autonomous sensor nodes use small photovoltaic (PV) panels oriented towards the direction that provides the highest energy yield in the worst-case scenario. Since all those panels operate at similar irradiance and ...
  • Journal of Electrical Bioimpedance 

    Pallàs Areny, Ramon (University of Oslo, 2018-07-30)
    Article
    Open Access
  • Multisensor system for analyzing the thigh movement during walking 

    Borghetti, Michela; Serpelloni, Mauro; Sardini, Emilio; Casas Piedrafita, Óscar (2017-08-01)
    Article
    Open Access
    Body movements monitoring may allow preventing, diagnosing, and recovering several wrong attitudes that could lead to possible future diseases. A multisensor system was developed to measure thigh movements in free-living ...
  • On the feasibility of noncontact ECG measurements 

    Pallàs Areny, Ramon; Casas Piedrafita, Óscar (2016-03-01)
    Article
    Open Access
    The article by Kranjec et al. [1], “Novel methods of noncontact heart rate measurement: A feasibility study” is interesting and informative as it compares different contactless methods for heart rate detection. Nevertheless, ...
  • The QT scale: a weight scale measuring the QTc interval 

    Couderc, Jean-Philippe; Beshaw, Connor; Xiaodan, Niu; Serrano Finetti, Roberto Ernesto; Casas Piedrafita, Óscar; Pallàs Areny, Ramon; Rosero, Spencer; Zareba, Wojciech (Wiley, 2017-01)
    Article
    Open Access
    Despite the strong evidence of the clinical utility of QTc prolongation as a surrogate marker of cardiac risk, QTc measurement is not part of clinical routine either in hospital or in physician of fi ces. We evaluated ...
  • On bio activity related signals from contactless electrode measurements 

    Pallàs Areny, Ramon; Casas Piedrafita, Óscar (2016-02-01)
    Article
    Open Access
    In a recent paper on a displacement current sensor for contactless detection of bio-activity related signals [1], it was stated that “A potential means for human presence detection…is via sensing…human biopotentials” ...
  • Low-power direct resistive sensor-to-microcontroller interfaces 

    López Lapeña, Oscar; Serrano Finetti, Roberto Ernesto; Casas Piedrafita, Óscar (2016-01-01)
    Article
    Open Access
    This paper analyzes the energy consumption of direct interface circuits where the data conversion of a resistive sensor is performed by a direct connection to a set of digital ports of a microcontroller (µC). The causes ...
  • Entropy characterisation of overstressed capacitors for lifetime prediction 

    Cuadras Tomàs, Àngel; Romero, Ramón; Ovejas Benedicto, Victòria Júlia (2016-12-30)
    Article
    Open Access
    We propose a method to monitor the ageing and damage of capacitors based on their irreversible entropy generation rate. We overstressed several electrolytic capacitors in the range of 33 µF–100 µF and monitored their entropy ...
  • An algorithm for beat-to-beat heart rate detection from the BCG based on the continuous spline wavelet transform 

    Alvarado Serrano, Carlos; Luna Lozano, Pablo Samuel; Pallàs Areny, Ramon (2016-05-01)
    Article
    Open Access
    This work describes an algorithm intended to detect the beat-to-beat heart rate from the ballistocardiogram (BCG) obtained from seated subjects. The algorithm is based on the continuous wavelet transform with splines, which ...
  • Calibration-less direct capacitor-to-microcontroller interface 

    López Lapeña, Oscar; Serrano Finetti, Roberto Ernesto; Casas Piedrafita, Óscar (Institution of Electrical Engineers, 2016-02-18)
    Article
    Open Access
    A new technique to measure a capacitor or a capacitive sensor by means of a direct sensor-to-microcontroller interface circuit that does not need a calibration capacitor is proposed. Basically, the measurement process ...

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