国产欧美精品一区二区,中文字幕专区在线亚洲,国产精品美女网站在线观看,艾秋果冻传媒2021精品,在线免费一区二区,久久久久久青草大香综合精品,日韩美aaa特级毛片,欧美成人精品午夜免费影视

For the specific needs of multi-point temperature and humidity monitoring system, this paper designs a multi-point temperature monitoring system. based on RS485 communication bus. STC12C5A60S2 single-chip microcomputer is used as mainly controlling node of the Lower computer. The DHT21 digital sensor is used by slave node to collect data of temperature and humidity. The temperature data collected is transmitted to the PC by RS-485 bus, that users can view the real-time data of each node through personal PC in the greenhouse. This paper mainly introduces the design process and debugging of hardware and communication software. PC software is C++ designed. PC terminal enables to realize the real-time digital and curve display of the temperature and humidity data, the set and control function. This system has been used in the laboratory. The practice shows that the system runs reliably, has the advantages of small volume, cheap price and so on. It can be used in the areas of living quarters, factories and buildings.