Design and implementation of a multi-channel data acquisition system based on STM32 and Qt

Abstract To meet the requirements of high precision, multi-channel capability, and real-time performance for data acquisition in scientific research, industrial production, and other fields, a multi-channel data acquisition system based on the STM32 microcontroller and Qt development framework is designed and implemented. The system adopts the STM32F407ZGT6 as the main control chip of the lower computer, collects multi-channel environmental data through temperature, humidity, illuminance, and noise sensors, and transmits the data to the upper computer via serial communication after digital filtering and preprocessing. The upper computer is developed based on Qt 5.9.1, integrating functions such as real-time data display, curve plotting, MySQL database storage, and historical data query. Test results indicate that the system features a stable sampling rate, reliable data transmission, and a measurement error of less than ±1%. It can realize synchronous acquisition, real-time monitoring, and offline analysis of 4-channel sensor signals, satisfying the needs of data acquisition applications in various scenarios.