Abstract
Greenhouse is the important part of installation agriculture.Crop production in domestic and overseas greenhouses shows that advanced automation and management system for greenhouse will improve the efficiency of agriculture production.With the rapid development of sensor,comp-
-uter and communications technologies,the design of monitoring&controlling systems for greenh-
-ouse environmental has become one of the R&D focuses in the field of structured agriculture.The paper is dedicated to the research.
On the basis of domestic and foreign references, this paper does not only generally state the history and reality of the greenhouse’s development both at home and abroad, but also introduce the tendency and direction of the monitor and control system for the greenhouse environment and therefore raises a suitable control programme for the system, according to the conditions, controlling characteristics and methods of the environment factors such as temperature, humidity and light.
This article take micro controller LPC2132 of PHILIPS Corporation as a core, this dissertation designs the sensor of temperature,humidity and light, whose signals are transmitted to LPC2132 for data precessing and as a result, environment factors’ measurement and control is realized.
As for hardware, this paper introduces each part’s design idea, principle and anti-jamming method and provides with drawings of the system’s hardware. In addition, in the premise of meeting system’s design requirements, choose components of low price and low power consumption as far as possible, to reduce the costs of the system.
In the aspect software,This article has inserted embedded Operation system UC/OS-Ⅱto transplant LPC2132, on the basis of which the processing charts of the controller are designed.
PID control algorithms is adopted to control the environment factors such as temperature, humidity and light. The principle of this algorithms is also introduced in the paper.
In the end, my paper summarizes the whole design, the major tasks of this dissertation and the characteristics and significance of this paper, as well as pointing out the deficiencies and improving methods of the system, which lay a solid foundation for further research.
KEYWORDS: greenhouse environmental; the supervisory system; LPC2132; Sensors; RS-485communication