Sistema experimental de monitoramento e controle para casas de vegetação baseado em redes de controle distribuído LonWorks. / Experimental greenhouse monitoring and control system based on LonWorks distributed control network.

AUTOR(ES)

Gilberto Alves Pereira

DATA DE PUBLICAÇÃO

2006

RESUMO

Protected agriculture using greenhouses allows high quality crops and in any time of the year. The technology has a preponderant role in the control of these environments, although no always successfully. Conventional solutions, such as Programmable Logic Controllers, or systems with proprietary technology are predominant. The evolution of the communication technology is making possible the diffusion of computer networks use in other applications: control networks start to awake the interest of both researchers and users, changing the paradigm of monitoring and control systems conception. The traditional systems with centralized architecture tend to be replaced by distributed technology, and the Internet use makes possible the supervision and control from anywhere. This work discusses the control networks technology applied to greenhouses, involving architecture aspects, intelligence distribution, incremental growth, flexibility and costs. For the implementation and assessment of an experimental system based on LonWorks® technology, a greenhouse at Instituto de Biociências at Universidade de São Paulo was used. Off the shelf intelligent nodes were used and an experimental node was developed. The implementation made possible the experimental verification of advantages and disadvantages of the use of distributed and centralized approach. It was evidenced easiness of implementation, cabling reduction, flexibility and interoperability of the solution. However, the costs tend to be raised in the distributed approach, referring to support tools and intelligent nodes. Besides the new technology application evaluation, a step-by-step sequence is proposed for the migration from a conventional system to a control system, and presents a Web Lab system that enables remote experimentation.

ASSUNTO(S)

engenharia agrícola greenhouse agriculture estufas agricultura agricultural engineering

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