Energy harvesting using a dynamic weighing system based on piezoelectric materials Najoua Fangachi, Ikrame Najihi, Madiha Yessari and Abdelowahed Hajjaji Eur. Phys. J. Appl. Phys., 97 (2022) 83 Published online: 17 November 2022 DOI: 10.1051/epjap/2022220100