This paper introduces the main function of the instrument of rotational speed measure and alarm, the working scheme of the system, hardware design and software design.
本文介绍了回转机械转速测量报警仪的主要功能，系统的工作原理，硬件设计和软件设计。
The system consists of concentrating fire alarm device and regional fire alarm device. It is characterized as simply structure, working reliable, function powerful, price cheap and practical.
该系统由集中火灾报警器及区域火灾报警器组成，具有结构简单，工作可靠，功能完善，造价低廉，实用等特点。
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