Design of a Multi-Channel Gas Sensor Detection System Based on STM32 Microcontroller and LabVIEW

Abstract

To address the needs of gas sensitivity performance testing, a multi-channel gas sensor detection system based on an STM32 microcontroller and LabVIEW was designed. This system combines signal acquisition, data processing, date display, and storage into a single unit. The target gases are detected using the sensor array, and the regulated electrical signal is supplied to the MCU. Through the built-in A/D converter, the electrical signal is converted to digital data, which is then evaluated and processed. Finally, the serial communication function is performed in the upper computer to realize the OLED display and dynamic display of the data waveform graph. The test results from the fixed resistance test system error demonstrate that: the system test error between 1.4%–2.0%, to achieve multi-channel gas sensor signal collection and detection, and the design of low cost, good stability, to fulfil the gas sensor detection needs.

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“…The producer and consumer model in Labview provides a more flexible design process. This mode can not only process data quickly and stably, but also avoid data loss caused by speed mismatch between data acquisition and data processing by making use of the first-in-first-out characteristics of data in the queue [19]. The data storage function part uses this mode to build the program block diagram, as shown in the figure.…”