01-04-2011, 04:01 PM
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Abstract
According to the environmental parameters monitoring requirements in greenhouse, a wireless
measurement and control system for temperature and humidity is developed. It overcomes the disadvantages
of wired monitoring system, such as complicated wiring, and difficult maintenance. The environmental
parameters in every greenhouse were measured and controlled by microcontroller.
The hardware and software of the monitoring system are discussed in detail. The experimental results show
that the developed monitoring system has the following features, such as simple structure, high reliability,
good extensibility and flexible configuration. It can control and adjust automatically the environmental
parameters in every greenhouse, and has project
practicality and vendibility.
INTRODUCTION
For the large rural distract, the greenhouse production has become a way of being rich. The growth
of crop in greenhouse depends on temperature, humility and other parameters in greenhouse. So it is
important to real-timely and properly measure and adjust the temperature, humility and other parameters
in the greenhouse. With the continued expansion of production scale, the disadvantages of
traditional wire monitoring system are more and more prominent, such as complicated arrangement,
difficult maintenance and so on. Then the wireless monitoring system is developed, which based on
wireless communication technology, does not need cables, adds or reduces configuration at random, possess
simple system construction. Moreover, it is characterized by its low power consumption,simple net
construction. Therefore, it proves to be simple and of practical significance
A greenhouse environment parameters monitoring system based on wireless communication technology has
been developed, which realizes the measurement, summary and control of temperature, humility and the
other parameters.
BLOCK DIAGRAM
The diagram of monitoring system for environment parameters in greenhouse is shown in figure 1.
It includes every terminal, centralized control unit, PC and serial communication circuits. On the one hand,
every terminal takes charge of collecting temperature, humility, carbon dioxide and other parameters, and
transmit these parameters to centralized control unit by wireless sending modules; on the other hand, it takes
of carrying out the instructions sending by PC and then to adjust these parameters.
Centralized control unit not only summarizes the data collecting by every terminal and transmits these
Parameters to PC, but also receives control instructions from PC and also sends it to every terminal to
adjust the environment parameters of every terminal. The PC collects the environment parameters of every
terminal, handles and displays it, which gives all kinds of control instruction according to these parameters.
Serial communication circuit achieves the level conversion between the microcontroller and the PC in order
to realize the communication between them.
