The MCS-51 series of single-chip microcomputers have rich I/O ports, timers, interrupt systems and other hardware resources and powerful instruction systems, which are particularly suitable for applications in the control field. The automatic monitoring system of environmental parameters in the tobacco factory introduced in this article adopts a control system with the 80C31 single-chip microcomputer as the core, which has the characteristics of high automation, simple structure and low cost. The friendly operation interface and flexible monitoring method are the two major features of this design. In addition, the power-off data storage, voice alarm, system startup self-test and other functions have been expanded to enhance the practicality of the system. Keywords: 80C31 single-chip microcomputer, sensor, communication;
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