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Web-Based Distance Experiments for Real Time Control

Timothy Chang and Puttiphong Jaroonsiriphan Department of Electrical & Computer Engineering New Jersey Institute of Technology, 07102

Keywords: Web Experiment, Real Time Control, Telepresence

Abstract: This work focuses on the design and implementation of web- experiments based on the LabVIEW/Datasocket approach to enhance streaming of live data as well as to facilitate the interaction among the various system modules such as PC platform, digital signal processor board, client/server interface, and the experimental hardware. Besides the LabVIEW based client programwhich requires the remote PC to have LabVIEW installation, a web-browser based client plugin has also been generated for students/users who do not have programming experience with LabVIEW. Test results for multi-client access have been favorable. Reliable real time control bandwidth was detected at about 3KHz, adequate for undergraduate control experiments. The same client/server interface can also be applied to a wide range of experiments for 24/7 and multi-users global access. Other advantages of web-based experiment include: improved safety conditions, reduced cost, and broad base access for all students (full/part time, handicapped). Examples include identification of dynamic systems and DC motor control. Student response and implementation experience are also described.

(I) Introduction It is well established that hands-on experience can significantly improve student learning and interest level in the course materials [1]. This is especially important in courses that are theoretical with a high degree of mathematical analysis. However, a number of constraints prevent the broad base integration of experiments into engineering courses. For examples, laboratory facilities/hours, safety issues, and software development effort are a few of the limiting factors that most instructors would encounter. With the increase in bandwidth through high speed and ISDN data lines, web-based distance experiments can play a significant role in supporting the learning process by providing a 24/7 laboratory with real time experiments so that the students can draw realistic conclusions and gain insight for real-life problem solving.

A number of web-based distance experiments are already in place. Earlier systems [2], [3] rely on custom software development e.g. cgi/Perl, Java/C++, etc. Maintenance and upgrade of the codes become problematic. Furthermore, most earlier system lack real- time streaming capabilities due to the client side control privilege. The more recent implementations of the web experiments are based on existing software platforms such as LabVIEW or Matlab. In [4], [5], and [6], various web experiments are supported by the

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Jaroonsrisphan, P. (2002, June), Web Based Distance Experiments For Real Time Control Paper presented at 2002 Annual Conference, Montreal, Canada. 10.18260/1-2--11334