| The environmental control of Poultry house and livestock stall has great significance for keeping animal's health and maximizing its growth performance in Livestock and poultry Production. Livestock and poultry production practice and related scientific research has shown that the growth, health, reproduction status and feed utilization of livestock and poultry are restricted by the environment of its house and stall. The environmental condition of Poultry house and livestock stall has become an important factor in development of Poultry house and livestock production. Environmental control of Poultry house and livestock stall mainly includes two aspects: one is the in-house air condition control which is mainly directed against in-house temperature, humidity and other environmental factors; the other is in-house air quality control which though harmful gases monitoring.In this paper, in connection with current Livestock and poultry production industry development situation at home and abroad, and with problems which affected development of Chinese Livestock and poultry production industry, based on the analysis and study of livestock and poultry production technology, proposed and set up the environmental control system based on PIC18F2580This system set up with PIC18F2580 chip, read-only memory, logic modules and A / D converter circuit and D / A converter circuit. Under the support of control software, CPU can control the peripheral circuits.This paper presents the system's overall structure, function design, makes concrete of major component's function and how to carry it out. The main research works are as follows:1. Designed the circuit of the detection system and control system, build up a circuit board test platform.Detection system mainly applied with digital temperature and humidity sensors SHT11, infrared carbon dioxide sensor EM6004. A number of detection points were set up around the test place.2. Through the C programming, completed the lower computer environment detection system and control system software development, including ventilation fans and spray fans control, its running well for environmental factors Detect and control test.3. Through the Delphi programming, completed upper computer management software development, solved the communication problem between the upper and lower computers. Set up the monitoring process file database base on Microsoft SQL Server 2000. This software is response for the communication among the single-chips, recording monitoring environmental factors. Users can set their own circumstances by change the control parameters in accordance with the actual condition.4. After the test of the designed hardware and software which use to detect and control the environment factors of livestock stall and poultry house on the test platform ,the experimental results show that the system is basically stable and working properly, meets the basic control requirements, it effectively decrease the concentration of carbon dioxide by 85.1PPM on average , decrease the temperature by 4.15℃on average. The system temperature measurement accuracy up to±0.4℃, humidity measuring accuracy reach±3.0% RH, the measurement deviation of carbon dioxide concentration maintained at±5%. It's effectively easing the bad effects such as high temperature and high concentration harmful gases for the livestock and poultry production. It is also greatly improved the automation rate of Environmental control for livestock install and poultry house.In short, this environment automatic control system has important practical significance for solve the environmental problems in closed livestock stall and poultry house, it's also help to improve animal growth performance and feed utilization, and reduce the incidence of illness.
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