Energy harvester and corresponding device

An energy harvester, comprising:

• an elongated tubular casing extending around a longitudinal axis between opposed first and second ends;
• at least one body arranged in the elongated tubular casing;
• and
• at least one helical electrical winding wound around the longitudinal axis of the elongated tubular casing;
• wherein the at least one helical electrical winding comprises a helical spring of electrically-conductive material arranged in the elongated tubular casing between the first end and the second end of the elongated tubular casing;
• wherein the at least one body is mechanically coupled to said helical spring and movable along the longitudinal axis of the elongated tubular casing with an alternate motion away from the first end towards the second end and away from the second end towards the first end;
• wherein said alternate motion of said at least one body results in motion of at least one turn of said helical spring along said longitudinal axis to produce a first electrical signal due to an electromotive force in the helical spring;
• and
• wherein at least one of the opposed first and second ends of the casing comprises a piezoelectric transducer configured to co-operate in a kinetic energy transfer relationship with the at least one body as a result of the at least one body reaching in said alternate motion an end-of-travel position towards the piezoelectric transducer so as to produce a second electrical signal.