The Design And Implement Of Embedded Control System Of Greenhouse

The environmental factors acquisition equipment of the traditional greenhouse such as temperature sensor adopted the way of cable connection, which is not to the benefit of the agriculture cultivation of the farmers. In addition, many agricultural greenhouseuses single chip microcomputer as its core. Although the single chip microcomputer is cheap, the resource of it is limited and can not run the operating system. The human-computer interaction page is not friendly and is to the disadvantage of the operation of the farmers. There are also PLC(Programmable Logic Controller) in the greenhouse as the core controlmachine, which occupies a large area of the space and cost a large sum of money.The text design and develop a intelligent controller of greenhouse based on embedded technology and wireless sensor network technology. The front-end environment acquisition factor of the system uses the wireless sensor node of CC2430. CC2430 is then transmitted to the receiving terminal. The environmental information is transmitted to the central controller S3C2440 through RS232 serial port. The central controller uses the Linux operating system. While the graphical interfaces display use the graphical interface design, which is favorable for the use and operation of the staff. The central controller process the environmental information of the greenhouse and control the temperature of the greenhouse through vague PID controlling strategies, which ensures the indoor temperature to the level of preference temperature of the crops. The central controller also has the functions of data storage and curve plotting, which could record all kinds of environmental factors of the greenhouse for a given period of time, using the database of Sqlite. In addition, the system set two kinds of modes which are automatic control and manual control.The external execution system of the system could run the corresponding operations after the tests. The test has showed that the controller have effective control to the changes of the indoor temperature and humidity, thus weakening the influence of the regional environmental factors towards the growing of the crops. All of this is of practical and promotion significance.