Study And Design Of Greenhouse Data Acquisition System Based On IEEE1451.2 Standard

In mordern technology of sensors, the application of MEMS technology and intelligenized sensor are the most important direction of the development of the technology of sensors. Combined with the 2005 science and technology project for Zhejiang Province "the research for the key technology of cost and applicable environment measurement-control system based on embedded technology in facility agriculture", smart sensor based on IEEE 1451.2 standard was firstly be applicated in the greenhouse measurement and control system in the design about this paper, the sorftware and hardware design of this data acquisition system about this paper were completed, and it worked well in debugging.Analyzed the fact of measurement-control system of manufacture greenhouse in this paper, temperature, humid and illumination were thought to be the most important facts in theenvironment of these greenhouses. The right sensors------LM35, JY526, H1H4000 were selected,and they were integrated into a same circuit, this is propitious to the application in practice products.Based on the fact of greenhouse measurement-control system and the selection of sensors, and the introduction of IEEE1451.2 standard, characteristic of this standard was analyzed, and the former study was summarized in this paper. The chip P1C16F873A was selected as MCU, 24LC256 was selected as expend EEPROM, the RS232 was selected to connect STIM and NCAP, through these things, and the hardware construct of this system was build. Based on the analysis of the whole 8 types of TEDS of IEEE1451.2 standared, 3 types of TEDS were designed, they were Meta TEDS, Meta-ID TEDS, and tunnel TEDS which include temperature tunnel TEDS, humid tunnel TEDS and ilium tunnel TEDS, and the Meta TEDS and tunnel TEDS were necessary according to the standard. Based on the debugging of "series debugging assistant", it was indicated that this system could rightly perform the instruction based on IEEE 1451.2 standard.Based on the analysis of the current study on digital filtering, an improved digital filtering type was suggested in this paper.At the last of this paper, based on the programming environment of "series debugging assistant(V2.2)", the running pictures of this system were showed. And some good suggestions were given which will be usefull for the further study and design.The sensors based on 1EEE1451.2 standard are wery important to to the future measurement-control manufacture, however, the wide application of this standard should depend on the whole perform by most of the manufactures. Take into account the life of measurement-control system will be decades of years, so the traditional sensor and smart sensor will coexist in a long time.