Design of data acquisition system for surface pressure perception matrix

摘要

In last few years, with the rapid development of robot technology, human-machine interaction technology has increasingly become the focus of many researchers. The security of human-computer interaction is becoming more and more important. As an important part of human-machine interaction, robot active sensing has also become an important field of human-machine interaction. Aiming at the requirement of active sensing technology in the field of human computer interaction, a low-cost data acquisition system for surface pressure sensing is designed by using STM32 microcontroller and film pressure sensor matrix. The system architecture, acquisition circuit and high-speed communication circuit are discussed detailly in this paper. The experimental results show that the system can collect all sensors' data of the pressure matrix, data acquisition frequency is 50Hz. The real-time display of the host computer is realized, and the network expansion interface is reserved to facilitate the expansion of the system. The linear fitting method is used to correct the sensors, and the perception accuracy of the pressure matrix sensors is improved. The pressure sensing surface can be used to create the perception of the floor, the cushion or desktop perceived perception and so on. It is a useful supplement to the field of active perception in the field of human computer interaction.