A High-Resolution Film-Resistance Plantar Pressure Sensor

It is a crucial point to monitor real-time plantar pressure for application in physical condition assessment and sports injury diagnosis. In this work, we report a high-resolution (sensitive points number of 187) plantar pressure sensor (PPS) array based on the piezoresistive principle. It consists of a force-sensitive film (FSF) and a network of orthogonal conductive threads on both sides. The PPS could achieve a sensitivity of 0.124 kPa-1, a measurement range of up to 50 kPa, and excellent stability. An intelligent insole system consisting of a centimeter-level resolution PPS array, wireless Bluetooth transmitter data acquisition system, and wireless receiving terminal intelligent system is established to monitor and map the plantar pressure in real time. This intelligent insole system can identify various standing and sports positions, which is a terrific way to monitor health, avoid injuries, and train athletes.