A flexible printed circuit flex-PCB sensor includes a sheet of electronically printable flexible material, sensor cells printed on said sheet and each including a sensitive element and a circuit. Each sensitive element is arranged to measure a predetermined physical parameter and to obtain an associated measurement signal. Each circuit is arranged to receive and process the measurements signal in order to obtain a corresponding output signal. Communication means are arranged to transmit the digital signals coming from said sensor cells to a remote processing circuit. The sheet is coiled according to a three-dimensional shape having a layered structure. Layers of said sheet are placed side by side and form a sensing border that is substantially perpendicular to the surface of said sheet. The relative position of each sensitive element and of each circuit inside the sensor relative to said sensing border depends on their relative position thereof.