title: Easy Handling of Sensors and Actuators over TCP/IP Networks by Open Source Hardware/Software.
abstract: There are several specific solutions for accessing sensors and actuators present in any process or system through a TCP/IP network, either local or a wide area type like the Internet. The usage of sensors and actuators of different nature and diverse interfaces (SPI, I2C, analogue, etc.) makes access to them from a network in a homogeneous and secure way more complex. A framework, including both software and hardware resources, is necessary to simplify and unify networked access to these devices. In this paper, a set of open-source software tools, specifically designed to cover the different issues concerning the access to sensors and actuators, and two proposed low-cost hardware architectures to operate with the abovementioned software tools are presented. They allow integrated and easy access to local or remote sensors and actuators. The software tools, integrated in the free authoring tool Easy Java and Javascript Simulations (EJS) solve the interaction issues between the subsystem that integrates sensors and actuators into the network, calledconvergence subsystemin this paper, and the Human Machine Interface (HMI)-this one designed using the intuitive graphical system of EJS-located on the user's computer. The proposed hardware architectures and software tools are described and experimental implementations with the proposed tools are presented.
authors.affiliation: Department of Electronic, Computer Science and Automation Engineering, University of Huelva, Escuela Técnica Superior de Ingeniería, Ctra. Huelva-Palos de la Fra, 21819 Huelva, Spain. mjias@uhu.es.
authors.forename: Andrés
authors.initials: A
authors.lastname: Mejías
authors.affiliation: Department of Electrical Engineering, University of Huelva, Escuela Técnica Superior de Ingeniería, Ctra. Huelva-Palos de la Fra, 21819 Huelva, Spain. reyes.sanchez@die.uhu.es.
authors.forename: Reyes S
authors.initials: RS
authors.lastname: Herrera
authors.affiliation: Control and Robotics Research Group, University of Huelva, Escuela Técnica Superior de Ingeniería, Ctra. Huelva-Palos de la Fra, 21819 Huelva, Spain. marcoa@pi.uhu.es.
authors.forename: Marco A
authors.initials: MA
authors.lastname: Márquez
authors.affiliation: Department of Electrical Engineering, Electronics and Automation, University of Extremadura, Avenida de Elvas, s/n, 06006 Badajoz, Spain. ajcalde@unex.es.
authors.forename: Antonio José
authors.initials: AJ
authors.lastname: Calderón
authors.affiliation: Department of Electrical Engineering, Electronics and Automation, University of Extremadura, Avenida de Elvas, s/n, 06006 Badajoz, Spain. igonzp@unex.es.
authors.forename: Isaías
authors.initials: I
authors.lastname: González
authors.affiliation: Department of Electronic, Computer Science and Automation Engineering, University of Huelva, Escuela Técnica Superior de Ingeniería, Ctra. Huelva-Palos de la Fra, 21819 Huelva, Spain. andujar@diesia.uhu.es.
authors.forename: José Manuel
authors.initials: JM
authors.lastname: Andújar
keywords: Arduino; EJS; HMI; Internet-of-Things; Modbus; collaborative access; data acquisition; open source hardware/software; remote access