ENERGY HARVESTER

An energy harvester (100) comprising a base (110); one or more first resilient means (120) mounted on the base (110); a hollow chamber (130) having a mounting point (131) pivotally attached to the first resilient means (120) in static equilibrium in such a way that centre of mass of the hollow chamber (130) is aligned with the first resilient means (120) at the vertical axis; a hollow member (140) enclosed within the hollow chamber (130) being attached to one or more second resilient means (150) extending from the mounting point (131) in static equilibrium that centre of mass of the hollow member (140) is aligned with the second resilient means (150) at the vertical axis; a plurality of piezoelectric material-built cantilevers (160) mounted on the hollow member (140) and spaced apart from one another in a predetermined gap at the vertical planar that the piezoelectric material-built cantilevers (160) are varied in length and/or centre of mass; a primary storage (170) associated with the hollow chamber (130), the hollow member (140) and the plurality of piezoelectric material-built cantilevers (160) through an integrated circuit for storing harvested energy; wherein the energy is harvested through vibration of the plurality of piezoelectric material-built cantilevers (160) at its approximately resonant frequency, reciprocation of the hollow chamber (130) and the hollow member (140) upon applying kinetic force.