Design of a Portable Physiological Signal Data Storage System

A portable physiological signal data storage system based on STM32 is designed for the collection of human physiological parameters with large capacity and multiple parameters. STM32F411 is adopted as the main control chip, and 2G SD card is used as the main storage medium to realize real-time data storage. OLED display shows the real-time data. For the continuous and effective work of the system, we have equipped the battery management module. In addition, sleep mode and external interrupt trigger mechanism are designed to reduce the power consumption of the system. When the collected physiological signal frequency is high and the amount of data is large, we can put the original data into the ring buffer to achieve the same rate of data acquisition and storage. In this paper, an optimized file system is designed according to FAT32 file system specification, which can store the obtained data in the form of text in SD card quickly, and we also can customize the file name of the text. Experiments have shown that the system is portable, simple, accurate, and stable in the process of storing multiple physiological signal data.