Microcomputer integrated greenhouse controller

At present, China is the country with the largest area of ​​facilities for horticultural cultivation. In the middle and late 1980s, with the successful testing of high-efficiency and energy-saving solar greenhouse production technologies in the northeast region, they were quickly developed in northern China. Governments at all levels used it as a key measure to lead peasants to become wealthy, lead a well-off society, and cultivate new economic growth points in rural areas. Agricultural research institutions at all levels have also invested a great deal of manpower and material resources to conduct special studies on the construction and production technology of energy-saving solar greenhouses, and have made significant progress. Today, the development of solar greenhouses has evolved from the production of various off-season vegetable production facilities to the development of solar greenhouse gardening facilities and the development of facility agriculture, which has become a new industry for the comprehensive development of crop cultivation, aquaculture and aquaculture. According to statistics, the area of ​​energy-saving solar greenhouses in the country has reached 4.5 million mu by the end of 1998. In 1999, it was also a year for the development of energy-saving daylight, and the area has also increased significantly. By the end of 1998, Gansu Province had 95,000 acres of solar greenhouses, ranking seventh in the country, ranking first in the northwestern provinces. In 1999, 87,000 acres of solar greenhouses were newly built. In 2000, 17.78 million acres of solar greenhouses were newly built, indicating that the solar greenhouse area Still gradually expanding. Although the solar greenhouse cultivation technology has been widely used throughout the country, the development of the greenhouse industry in our country is far from the developed countries. As far as the whole country is concerned, the current development of greenhouses still has the problems of low technology content in facilities engineering, low controllability and low level of facilities environment, mostly based on traditional experience, production methods are time-consuming, laborious, and water fees cannot be adapted to modern agricultural industrialization in particular. The need does not realize the economies of scale of agriculture. Can not scientifically use water, fertilize and carry out automatic control and management of the crop growth process. The traditional production methods still lack quantitative indicators and complete sets of technologies. Labor productivity is very low, equivalent to only 1/10 or even 1/100 of the developed countries. For a long time, the process of industrialization and modernization of facility agriculture has been seriously affected. With the rapid development of micro-computers and sensing technologies, significant changes have taken place in the field of automatic detection and the research on automatic monitoring and control of the greenhouse environment has made remarkable progress. The horticultural facilities in the Netherlands and Israel have developed rapidly in the past 20 years. They have made innovative achievements in combination with their own conditions. Among them, drip irrigation and fertilizer application and greenhouse environmental control technologies have high levels, but their monitoring equipment is generally in the 3- 50,000 yuan, it is expensive. The microcomputer intelligent greenhouse integrated control system jointly developed by Lanzhou Hualian Electronics Co., Ltd., Lanzhou Science and Technology Association, and other five units has been at the leading level in China after four years of continuous improvement. The microcomputer greenhouse integrated controller is the core of the intelligent greenhouse. It is mainly used for the automatic detection and control of the environment of greenhouses and plastic greenhouses. In various solar greenhouses and greenhouses, in addition to monitoring greenhouse temperature and humidity, automatic ventilation, cooling and dehumidification, and ground temperature detection, an automatic irrigation flow management and control system is added. The device can be pre-set automatically The time program of irrigation and automatic fertilization can realize regular and quantitative automatic control and monitoring of existing irrigation, especially drip irrigation, sprinkler irrigation and infiltration, and can also automatically fertilize. The amount of irrigation water can be set for each time, and the current water consumption and total water consumption can be displayed. The use of this system to control sprinkler and micro-irrigation systems for closed water and water-conserving irrigation can effectively reduce the leakage and evaporation losses in the field irrigation process, making the utilization rate of water and fertilizer up to 80%—90%. Reduce agricultural water use by more than 30% and save 30%-50% fertilizer. You can also monitor the above data in real time at the computer terminal. The timing control of intelligent microcomputer solar greenhouse shutters controlled by latitude is based on the laws of sunrise and sunset at different latitudes and the actual distribution of solar radiation. The software automatically corrects the daily sunrise time at different latitudes. Then control the shutter time of the electric shutter, this device is suitable for use in the north-south latitude 0-56 area, latitude 0-56 covers most of the world countries and regions. The use of this system can improve ergonomics, which can be managed by 1 person to manage 1-2 greenhouses to 15-20 greenhouses. The microcomputer integrated intelligent controller has a high degree of intelligence, and the data is stable and reliable. It can independently control a variety of equipment for automatic control of the greenhouse environment and irrigation, fertigation control, irrigation measurement and accumulation and system alarm. It can also be used in conjunction with computerized facilities to monitor agricultural comprehensive environmental data. Various data can be transmitted to the computer via the RS-485 bus for recording or printing, and remote control. The controller is connected with the computer and can realize multi-point remote monitoring and control. Less than 32 microcomputer greenhouse controllers use a typical connection data transmission distance up to 1200m. 246 sets of microcomputer greenhouse integrated controller communication wiring using repeater and computer connection transmission distance.

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