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 alternating electrical signal (V(t)) collected by electrodes of the beam; and - a power management circuit, adapted to rectify and regulate the signal collected by the electrodes, for outputting a stabilized power supply direct voltage or current, wherein the power management circuit comprises: - an interface circuit coupled to the piezoelectric beam, adapted to receive as an input the oscillating alternating electrical signal (V(t)) provided by the piezoelectric beam and to output a rectified signal (V AC) comprising a sequence of pulses at a frequency equal to a multiple of the oscillation frequency of the pendular unit; - at the output of the interface circuit, a buffer capacitor adapted to be charged by the successive pulses provided by the interface circuit; - a converter regulator adapted to convert a discharge current of the buffer capacitor into said stabilized power supply direct voltage or current; and - a circuit for controlling the converter regulator, comprising a feedback control stage of the Maximum Power-Point Tracking, MPPT, type, based on an estimate of a power extracted from the piezoelectric beam, characterized in that the MPPT feedback control stage is adapted to be controlled by a current value (V DUTY) of a direct (α) or reverse (β) duty cycle of the pulses outputted at a frequency equal to a multiple of the oscillation frequency of the pendular unit at the output of the interface circuit. - 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 alternating electrical signal (V(t)) collected by electrodes of the beam; and - a power management circuit, adapted to rectify and regulate the signal collected by the electrodes, for outputting a stabilized power supply direct voltage or current, - an interface circuit coupled to the piezoelectric beam, adapted to receive as an input the oscillating alternating electrical signal (V(t)) provided by the piezoelectric beam and to output a rectified signal (V AC) comprising a sequence of pulses at a frequency equal to a multiple of the oscillation frequency of the pendular unit; - at the output of the interface circuit, a buffer capacitor adapted to be charged by the successive pulses provided by the interface circuit; - a converter regulator adapted to convert a discharge current of the buffer capacitor into said stabilized power supply direct voltage or current; and - a circuit for controlling the converter regulator, comprising a feedback control stage of the Maximum Power-Point Tracking, MPPT, type, based on an estimate of a power extracted from the piezoelectric beam,