2. Zhao Ke, Li Changxian and Zhang Tong. Wireless temperature and humidity controller based on STM32 [J]. Chemical automation and instrumentation, 2015,42 (06): 629-633 ... China hownet [reference date 20 17- 12-20].
The temperature and humidity controller is mainly composed of sensor, controller and heater, and its working principle is: the sensor detects the temperature and humidity information in the box and transmits it to the controller for analysis and processing: when the temperature and humidity in the box reach or exceed the preset value, the relay contact in the controller is closed, the heater is turned on to start working, and the box is heated or blown; After a period of time, the temperature or humidity in the box is far from the set value, the relay contact in the controller is disconnected, and the heating or blowing stops.
With the development of industry, the demand for on-site temperature and humidity control is getting higher and higher, and the traditional analog switch control has been difficult to meet the production requirements, so designing a more reliable and intelligent wireless temperature and humidity controller will have higher economic benefits and practical value. Wireless temperature and humidity controller is a new controller which integrates the functions of temperature and humidity signal acquisition, data storage, wireless transceiver, control and communication? .
The design of wireless temperature and humidity controller can collect, control and record the temperature and humidity of the production site for the harmful and dangerous workplaces that are difficult for human beings to reach or reach, so as to achieve the purpose of reliable production and improve product quality.
In addition, due to the large industrial field space, temperature and humidity are controlled variables with nonlinearity, pure lag and large inertia, so the field temperature and humidity control is carried out by combining decentralized control of slave machines and centralized control of master machine, that is, the temperature and humidity are collected and controlled by multi-point slave machines, and the information is transmitted to the central master machine through wireless module, and the central master machine transmits the given values and control parameters to all slave machines through wireless communication, so that the master machine can monitor them.
Baidu encyclopedia-temperature and humidity controller