Slio-can based actuation system for greenhouse control

Metrôlho, J.C.M.M.

http://hdl.handle.net/10400.11/6799

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Authors

Metrôlho, J.C.M.M.

Abstract(s)

This paper describes a system developed to implement the actuation after the data acquisition and processing from the plant. It was implemented over a previous developed CAN network, based on the 80C592 microcontroller from Philips implementing a hierarchical structure to form a tree topology. In this network a Personal Computer is connected through a Net Manager to units named Masters, located at the greenhouses, that allows the management of several secondary units named Slaves. This units are implemented using a SLIO (Serial Linked I/O device) from Philips, making possible the greenhouses control. This choice is due to the fact that the SLIO allows a cheaper solution to applications where no high speed requirements are needed such as the on/off functions. The assembling of the actuators within a greenhouse allows the use of an architecture whose communication is done through the main power cables. As mean of communication is used the CAN (Controller Area Network) protocol, which has a great flexibility and robustness needed in real-time control. The system, must allow easy expansion and configuration without compromising its performance. This is the case when the parameters must be changed whenever the weather conditions (Summer/Winter), force us to modify the setpoints of several control variables such as: temperature, light, humidity, among others.

Keywords

CAN Greenhouse SLIO Temperature

URI

http://hdl.handle.net/10400.11/6799

Citation

Metrôlho, José C. (1997) - Slio-can based actuation system for greenhouse control. In IEEE-ISIE’97 Student Forum, Guimarães, Julho de 1997 - Proceedings. [S.l.] : IEEE. pp.15-20.