Capacitive pressure sensors attract significant attention from researchers worldwide in the field of flexible sensing due to their advantages

such as simple structure

in sensitivity to temperature and humidity

and low power consumption

making them a current research hotspot.A capacitive flexible pressure sensor is designed in which polydimethylsiloxane(PDMS)with a spongy porous structure and composite sandpaper surface microstructure is used as the dielectric layer

effectively improving the sensor sensitivity.At the same time

a flexible microelectronic printer is used to print conductive ink on poyethylene t

erephthalate(PET)as a flexible electrode

which achieves the integration of the packaging layer and the electrode layer.Performance tests demonstrated that the sensor exhibits a high sensitivity of 0.215kPa

-1

with response and recovery times of 50ms and 100ms

respectively

a hysteresis error of less than 0.02

and excellent repeatability and stability.Finally

the sensor is demonstrated in applications such as human-machine interaction and human motion monitoring

including pulse detection and joint bending detection

proving its practicality and effectiveness in health monitoring and motion state monitoring.This work provides a valuable reference for subsequent research.