(完整 word 版)基于单片机的二氧化碳浓度检测器设计
As our country realizes the comparatively well-off level basically, people’s
living standards generally improve, especially the Large and medium cities need to
supply the fresh vegetables in anniversary, This needs to develop production of
the greenhouse Carbon dioxide on crop growth and plays a very important role. In
recent years, the rural north China have formed a greenhouse—led industrialization
of agriculture, therefore, applied for the increase of carbon dioxide created favorable
conditions。 Because different crops need different carbon dioxide concentrations, the
growth in carbon dioxide it difficult to control its facilities in the amount of
emissions, so carbon dioxide detector developed and used in greenhouse agriculture
production, raise agricultural science and technology to promote agricultural
income and farmers increase of 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 value, friendly interface。
The system has powerful function and low cost, suitable for greenhouse or plastic tunnel
testing of environmental factors.
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