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When the greenhouse temperature and humidity monitoring system entered the market and was applied to the planting and production of greenhouses , automation and sensor technology were not particularly mature in China. Therefore, technicians in the early stages aimed at the changes in temperature and humidity in greenhouses by studying microcontrollers. Based on the control principle, a computer-controlled greenhouse temperature and humidity monitoring system based on a single chip computer and a host computer is designed .
Early greenhouse temperature and humidity monitoring system based on single chip microcomputer In order to achieve temperature and humidity monitoring of fruit and vegetable greenhouses , it must have the following functions:
1. The system can collect and display the temperature and humidity in the greenhouse.
2. The user can set the appropriate temperature and humidity for the fruit and vegetable in the shed.
3. When the real-time temperature and humidity parameters in the greenhouse exceed the value set by the user, the system can control the corresponding local start and stop.
4. It can display the current temperature, humidity, time and other information in real time, and can manually query the temperature and humidity specific data for each time period monitored.
So to achieve the above functions, what should be the design principle of our single chip computer and host computer system?
First, the greenhouse temperature and humidity monitoring system collects the current temperature in the greenhouse through the temperature sensor ds18b20, and the humidity sensor hm1500lf collects the current humidity in the greenhouse. These data are further analyzed and processed by the single-chip microcomputer detection system, and then the information is uploaded to the PC through the communication line. On the PC, analyze and process the temperature and humidity information currently transmitted. The user can preset the temperature or humidity alarm threshold or preset value that he wants through the host computer, so as to realize the remote control function of crop growth in the system greenhouse. If the real-time value of the current environment exceeds the alarm threshold, the system will control the self-starting device actuator to adjust the temperature and humidity in the greenhouse through the setting of its own software system until the detected temperature and humidity are within the alarm threshold .
Early greenhouse temperature and humidity monitoring systems due to the shortcomings of sensor functions and intelligent technology, intelligent microcontrollers used to roughly monitor the changes in temperature and humidity in the environment. Although the temperature and humidity changes can be roughly monitored, due to the incomplete facilities, they have gradually been Replaced by intelligent greenhouse temperature and humidity monitoring system .
July 20, 2015
Chengdu Xinxin Electronic Technology Co., Ltd. Editorial Department
Editor: Little Devil in Gourd