The Foam Insulation Greenhouse Monitoring System Design

China’s population continues to increase and the continuous improvement of people’s living standard has brought considerable pressure to the supply of agricultural and sideline products in China. Huge pressure of market competition also makes China’s agricultural production must be traditional agriculture into efficient and high-yielding modern agriculture. Facilities agriculture use modern agricultural production techniques, greenhouse technology is a kind of agricultural facilities, which provides a suitable growth environment for crop production and improves the quality to the maximum, and the economic efficiency of agriculture has been greatly improved, it also reflects the direction of modern agricultural development. But China’s greenhouse control technology level is not high and greenhouse input is huge. Therefore, the study of greenhouse control technology is essential for China’s national conditions.This paper analyzes the main environmental factors that affect greenhouse crop growth, temperature, humidity, light. According to the alpine climate characteristics and the crop’s growth needs, greenhouse is designed into the bilayer membrane structure, which is different from traditional double film greenhouse. The bilayer membrane of the traditional greenhouse requires double skeleton support, while here bilayers greenhouse applies the foamed insulation technology. It uses the bubble generated by the foaming machine to distract the bilayers, which can save the cost of buttress material and enhance the insulation effect of the greenhouse. In order to detect the foaming condition, many plurality of electrode plates are covered to the plastic film. Additionally, when the distance of the bilayer membrane changes, the capacitance values will change. Based on this principle, the capacitive displacement sensor can monitor the foaming amount real-time.On the basis of the traditional greenhouse control technology, this text designs foam insulation greenhouse monitoring system. AT89C51microcontroller is the core of the greenhouse control, which selects AD590temperature sensor, humidity resistance CHR-1as the humidity sensor, the photosensitive element3DU33as the light sensor and ZJ-YDWS1capacitance displacement sensor to collect the greenhouse environmental factors. These sensors pass the datas to the microcontroller for processing after A/D conversion, then the SCM system issues the control commands to the implementing agency. Hardware design including temperature and humidity detection circuit, light detection circuit and microcontroller system peripheral circuit; The software part of the greenhouse control system draws the flow chart, including the main program flow chart, acquisition subroutine flow chart, clock subroutine flow chart, communication subroutine flow chart and controlling subroutine flow chart. This text uses C language to program. Finally, this text gives the simulation of the greenhouse system designed, which shows validation and feasibility of the designed system.