An energy harvesting module, comprising: a pendular unit subjected to external stresses applied to the module, the pendular unit comprising a beam that is elastically deformable in bending according to at least one degree of freedom, with a clamped end and an opposite free end coupled to an inertial mass , wherein the beam is a piezoelectric beam forming a mechanical-electrical transducer adapted to convert a mechanical energy produced by oscillations of the pendular unit into an oscillating electrical signal (V OUT (t)) collected by electrodes; and a power management circuit , adapted to rectify and regulate the signal collected by the electrodes, to output a stabilized direct power voltage or current, characterized in that the piezoelectric beam carries a plurality of electrodes (T1, T2, B1, B2, N) whose number and configuration define a plurality of pairs of electrodes between which a corresponding plurality of oscillating signals can be simultaneously collected, in that the energy harvesting module further comprises, between the piezoelectric beam and the power management circuit, a switching matrix adapted to selectively switch the plurality of pairs of electrodes between each other according to a plurality of different series (S), parallel (P) and/or series-parallel (SP) configurations, to output a combined oscillating signal applied to the power management circuit, and in that the switching matrix selectively switches as a function of a voltage level signal (V BAT ) of an energy storage component coupled to the power management circuit output and charged by said stabilized direct power voltage. a pendular unit subjected to external stresses applied to the module, the pendular unit comprising a beam that is elastically deformable in bending according to at least one degree of freedom, with a clamped end and an opposite free end coupled to an inertial mass , wherein the beam is a piezoelectric beam forming a mechanical-electrical transducer adapted to convert a mechanical energy produced by oscillations of the pendular unit into an oscillating electrical signal (V OUT (t)) collected by electrodes; and a power management circuit , adapted to rectify and regulate the signal collected by the electrodes, to output a stabilized direct power voltage or current, characterized in that the piezoelectric beam carries a plurality of electrodes (T1, T2, B1, B2, N) whose number and configuration define a plurality of pairs of electrodes between which a corresponding plurality of oscillating signals can be simultaneously collected, in that the energy harvesting module further comprises, between the piezoelectric beam and the power management circuit, a switching matrix adapted to selectively switch the plurality of pairs of electrodes between each other according to a plurality of different series (S), parallel (P) and/or series-parallel (SP) configurations, to output a combined oscillating signal applied to the power management circuit, and in that the switching matrix selectively switches as a function of a voltage level signal (V BAT ) of an energy storage component coupled to the power management circuit output and charged by said stabilized direct power voltage. <EOS>