Design Consideration of Data Acquisition System for Capacitive Plantar Pressure Insole

Gait, the term used to describe the manner in which people move while they walk, varies according to walking style, aging, illnesses, and accidents. It can be used to predict the diabetes course and disorders associated with the motor nervous system. A capacitive pressure sensor (CPS) can be employed as the plantar sensor when the user is walking. In order to improve the linearity of CPS, a data acquisition system (DAQ) based on the LC resonant principle that can decrease unanticipated EMI has been developed. The result demonstrates that the change in capacitance is linearly proportional to the pressure change. However, parasitic capacitance, thermal noise, body capacitance, and other factors still affect error and offset. Finally, further work is needed to improve the capacitance sensitivity of the plantar sensor.