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Abstract
With the development of modern technology, the production of modern life
continues to improve, for greenhouse technology to cultivate crops can significantly
increase the yield of crops, reducing the agricultural production of the natural
environment and climate change request. However, the greenhouse temperature and
humidity requirements for a series of air composition indicators are very strict, and
greenhouse modernization must have a set of temperature and humidity measurement
and control system, the design is for people living with and the continuous
improvement of production level, to the living environment and the requirements of
the production environment is particularly important, control temperature and
humidity is a typical example, therefore, emerge as the times require an intelligent
temperature and humidity detection system in modern life and fast, convenient and
reliable detection system, especially in the industrial production if the detection of
inaccurate will occur in many production accidents. To provide a better life for
modern people to work, scientific research, and more convenient facilities, we must
start from the SCM technology, all toward digital control system, intelligent control
direction. The design is based on single-chip microcomputer as the core, with the
temperature and humidity sensor, detecting system and related peripheral circuit, can
receive the measurement of environmental temperature and humidity signal, detecting
personnel can be displayed by the LCD data, the temperature and humidity of
real-time monitoring of the environment. The measurement operation all can be
realized through the host computer control software, the measurement signals are
temperature and humidity sensor, the circuit is converted to electrical signals, and
then the data were processed by conversion to SCM, through the software analysis
processing evacuation display device.
The system hardware and software design, including the system of high reliability,
simple structure, realizes the automatic control of temperature and humidity. The
system also applies RS232 and host machine is connected, can parameters related to
the automatic recording of temperature, humidity settings, can also be set at a certain
time automatic recording, available in the meteorological observation.
Keywords :STC89C52 microcontroller, temperature and humidity sensor, LCD
display