Design And Experimental Research Of Greenhouse Environment Computer Control System

Greenhouse is not only an important component of installation agriculture but alsoone of the key aspects of modern agricultural development. Experience gained ingreenhouse has shown that the efficiency of greenhouse production can be fully promotedby elevating automatic control level, which can explain why most farmers cannotmaximize their profits even though they make great efforts in artificial management.Moreover, such modern facilities as temperature and humidity controllers and monitoringsystem are too expensive and complicated for them. Thus, this thesis designs a low-costgreenhouse environment computer control system.This system is composed of computer terminal as a host computer and aCC2530F256SCM as a slave controller. The computer terminal can be used to set andcontrol all the factors in real time during the production process in the greenhouseenvironment. The comparison between real-time data and parameters determine the actionof the output device, which may promptly and effectively regulate the greenhouseenvironment and make it an optimal one for crops.Parameters detection is composed of temperature, humidity, CO2density andilluminance data. The temperature is measured by DS18B20and output by process circuit.The moisture is detected by a soil wetness sensor.Data processing system mainly consists of data storage, data display, and sound-lightalarm. Data storage is realized by CC2530F256SCM with built-in EEPROM. As a displayinterface, the computer terminal will display real-time parameter of each environmentalfactor. Once a greenhouse environmental factor oversteps the preset upper or lower limit,the loudspeaker and light emitting diode will give an alarm.