An energy harvesting module, comprising a pendular unit subjected to external stresses applied to the module, the pendular unit comprising a piezoelectric transducer extending, along a central axis (Δ) corresponding to a direction of greater length of the piezoelectric transducer, from a distal end to an opposite proximal end, the transducer being elastically deformable in bending between a clamped end and a free end coupled to an inertial mass, the piezoelectric transducer being adapted to convert a mechanical energy produced by oscillations of the pendular unit into an oscillating electrical signal (V OUT (t)) collected by surface electrodes of the piezoelectric transducer, wherein: - the piezoelectric transducer comprises two coplanar piezoelectric beams (22, 22') arranged side-by-side on either side of said central axis (Δ), each of the piezoelectric beams comprising adjacent external and internal arms, arranged side-by-side and formed single-piece, - the external arm of each piezoelectric beam has a clamped proximal end and a free distal end, - the internal arm of each piezoelectric beam has a free proximal end supporting the inertial mass, and a free distal end connected to the distal end of the adjacent external arm by a common junction, and - the inertial mass as well as the respective clamped proximal ends of the external arms of the two piezoelectric beams(22, 22') are arranged at the proximal end of the piezoelectric transducer, and the respective common junctions of the two piezoelectric beams (22, 22') are arranged at the distal end of the piezoelectric transducer, whereby the oscillations of the pendular unit produce respective displacements of the two internal arms in a first direction and, simultaneously, of the two external arms in a second, opposite direction. the pendular unit comprising a piezoelectric transducer extending, along a central axis (Δ) corresponding to a direction of greater length of the piezoelectric transducer, from a distal end to an opposite proximal end, the transducer being elastically deformable in bending between a clamped end and a free end coupled to an inertial mass, the piezoelectric transducer being adapted to convert a mechanical energy produced by oscillations of the pendular unit into an oscillating electrical signal (V OUT (t)) collected by surface electrodes of the piezoelectric transducer, wherein: - the piezoelectric transducer comprises two coplanar piezoelectric beams (22, 22') arranged side-by-side on either side of said central axis (Δ), each of the piezoelectric beams comprising adjacent external and internal arms, arranged side-by-side and formed single-piece, - the external arm of each piezoelectric beam has a clamped proximal end and a free distal end, - the internal arm of each piezoelectric beam has a free proximal end supporting the inertial mass, and a free distal end connected to the distal end of the adjacent external arm by a common junction, and - the inertial mass as well as the respective clamped proximal ends of the external arms of the two piezoelectric beams(22, 22') are arranged at the proximal end of the piezoelectric transducer, and the respective common junctions of the two piezoelectric beams (22, 22') are arranged at the distal end of the piezoelectric transducer, - the piezoelectric transducer comprises two coplanar piezoelectric beams (22, 22') arranged side-by-side on either side of said central axis (Δ), each of the piezoelectric beams comprising adjacent external and internal arms, arranged side-by-side and formed single-piece, - the external arm of each piezoelectric beam has a clamped proximal end and a free distal end, - the internal arm of each piezoelectric beam has a free proximal end supporting the inertial mass, and a free distal end connected to the distal end of the adjacent external arm by a common junction, and - the inertial mass as well as the respective clamped proximal ends of the external arms of the two piezoelectric beams(22, 22') are arranged at the proximal end of the piezoelectric transducer, and the respective common junctions of the two piezoelectric beams (22, 22') are arranged at the distal end of the piezoelectric transducer, whereby the oscillations of the pendular unit produce respective displacements of the two internal arms in a first direction and, simultaneously, of the two external arms in a second, opposite direction.