Distributed Aquatic Breeding Supervisory Control System

Our country is a large agricultural nation, but average per person holds the cultivated area to be few, for satisfies food and the nutrition demand, must develop the aquatic products industry, there alization factorization cultivation. In recent years along with electronic technology and information technology rapid development, application automatic control and electronic accounting machine technology, and union modern industry technology and modern biology technology, in semiautomatic or entire automatic system trade and scientific high density cultivation high quality fish, shrimp, shell, and implements half seal or the entire seal control and the automated management to the entire process, to enhances the agricultural production efficiency and the promotion agriculture modernization has the vital significance.This topic in analyzes the domestic and foreign similar research in the foundation, developed one kind to suit the multi- variables, the multi- couplings, the non-linearity, the big lag, is very difficult to establish the precise mathematical model the complex dynamic system north fishpond characteristic and the environmental condition distributional aquaculture supervisory system, carried in the facility agriculture environment intellectualization supervisory system the lower position machine to be soft, the hardware design. The main research of results includes:1. It has constructed the aquaculture pond supervisory system which (on position machine) and many single chip microcomputers (lower position machine) constitutes by PC machine. The overall system carries on the unification by on position machine to dispatch and to manage, each aquaculture pond data acquisition and the environment control by respective lower position machine completes.2. The systems lower positions machine take the 80C196KC single chip microcomputer as the cores, between uses the transmitting range with on position machine to be possible to reach 1,200 meter RS-485way to carry on the communication. Has designed the sensor electric circuit, increased the expander. Software uses from bottom to top the structure loop check.3. On the system the position machine take Visual Basic as the development kit, the design supervisory system contains the out put, and so on the module, the contact surface in a friendly way, the software function is formidable. On the position machine already may the real-time logarithm according to carry on gathering, the analysis, the memory, and the best habitat scope which needs with the fish does compares, adopts the fuzzy control method, the output control strategy. Also may carry on the demonstration, processing, the printing, the analysis to the historical data, provides the scientific basis for the researcher. Are most with on position machine connection RS - 485 communications adapter may connect 250 lower positions machine, the system needs according to the user to be possible to realize carries on the system disposition and the expansion as necessary.4. This system uses the fuzzy control method, suits to fishpond this kind of more than variables, the multi- couplings, the non-linearity, the big lag, is very difficult to establish the precise mathematical model the complex dynamic system, uses it to be allowed to be convenient, precisely to implement the multi- factors integrated control to the fishpond.5. The developments databases use SQL Server, it has the good database design, the management and the network function nf, has facilitated future this system and the Internet connection.This aquaculture supervisory system trial test result indicated that, System performance stable, the movement is reliable, the ambient temperature control precision reaches±0.1%, the temperature control area is 0℃- 40℃, the oxygen control precision had achieved±0.5%, the scope is 0 - 10/20ppm. The system has saved the energy, raised the fishpond management automation level, and enhanced the fishpond output and the economic efficiency.