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论文基于单片机的二氧化碳检测仪设计

Carbon dioxide concentration detection

instrument based on MCU

ABSTRACT

With the development of modern society, agricultural and sideline products become the market in urgent need of supplies and so increase the overwhelming yield and quality of agricultural and sideline products, so we develop the carbon dioxide concentration detector and for sunlight greenhouse agricultural production, to improve the content of agricultural science and technology, promote agricultural income has far-reaching significance.

This thesis presents the measuring and controlling system about temperature, humidity and carbon dioxide's density in the greenhouse, composed of host PC and secondary MCU. Considering the accuracy and economical, this thesis design AT89S52 as the core control apparatus, and choose the sensors with high ration between performance and cost. it achieved accurate measurement and accuracy control. When the parameter has exceeded the limit, including temperature, humidity and carbon dioxide's density, the single-chip microcomputers activate the audible and visual alarm. At the same time, the single-chip microcomputers control the solid state relay to actuate mechanism for compensation .For different parameters, we can use keyboard to set the anticipant range of the crop. The secondary computer communicate with the host computer through RS232.

This system is easy to operate, reliable, easy to expand and so on. The system taking into account the increased complexity of the greenhouse environment to achieve multi-point multi-sensor target of cytokines. System is small, the operation is very simple and flexible for different environments, different requirements of different crops can be modified at any time limit alarm