Harvest Transducer

A harvest transducer includes a moving cylinder; a coil system having a first coil and a second coil, the first coil and the second coil being surrounding the moving cylinder, the coil system further having magnetic means for generating a magnetic field and arranged on the moving cylinder; a rechargeable battery electrically connected with the second coil to store energy generated from the coil system; wherein the first coil and the second coil are connected in series.