Design of SCADA Systems for Medical & Industrial Applications using Arduino AtMega8 & MATLAB M.Tech(Embedded systems), Dept. of ECE,Kuppam Engineering College,kuppam,Chittoor(dst),A.P 1 . Asst.Professor, Dept of ECE, Kuppam Engineering College, Kuppam, Chittoor(dst) .A.P 2 . M.Tech(Embedded systems),Dept.of ECE, Kuppam Engineering College,Kuppam,Chittoor(dst)A.P 3,4. . ABSTRACT The main intention of this Research work is to design low cost supervisory control and data acquisition(SCADA) systems using Arduino AtMega8 and MATLAB. This Research work will be implemented for two distinct areas that are Industrial and Medical. In industries this can be used for the controlling of Water tank Motor that means ON and OFF mechanism, various power section controlling, data acquisition from the sensors for example boiler temperature measurement etc. And in the Medical field which is used for pulse rate monitoring of patient and it warns if the pulse rate exceeds beyond the limit. The design interpretation of SCADA Systems as follows,. First the sever programming is to port on to the microcontroller ( AtMega8).This program facilitates to access all pins from MATLAB. This project includes the design of GUI(Graphical User Interface) using Guide tool in MATLAB environment. The user communicates with the external hardware through MATLAB GUI. This can be achieved by interfacing MATLAB GUI with AtMega8 microcontroller. The microcontroller responds according to instructions given by the MATLAB GUI. Index Terms: MATLAB, AtMega8,Sensors, Data Acquisition,Arduino. 1. INTRODUCTION If you are going to be a physicist or engineer, you will have a lot to study: two hundred years of the most rapidly developing field of knowledge that there is. So much knowledge, in fact, that you might think that you cannot learn all of it in four years, and truly you cannot; you will have to go to graduate school too!. Surprisingly enough, in spite of the tremendous amount of work that has been done for all this time it is possible to condense the enormous mass of results to a large extent—that is, to find laws which summarize all our knowledge. Even so, the laws are so hard to grasp that it is unfair to you to start exploring this tremendous subject without some kind of map or outline of the relationship of one part of the subject of science to another. Each piece, or part, of the whole of nature is always merely an approximation to the complete truth, or the complete truth so far as we know it. In fact, everything we know is only some kind of approximation, because we know that we do not know all the laws as yet. Therefore, things must be learned only to be unlearned again or, more likely, to be corrected. The principle of science, the definition, almost, is the following: The test of all knowledge is experiment. Experiment is the sole judge of scientific "truth." But what is the source of knowledge? Where do the laws that are to be tested come from? Experiment, itself, helps to produce these laws, in the sense that it gives us hints. But also needed is imagination to create from these hints the great generalizations—to guess at the wonderful, simple, but very strange patterns beneath them all, and then to experiment to check again whether we have made the right guess. This imagining process is so difficult that there is a division of labor in physics: there are theoretical physicists who imagine, deduce, and guess at new laws, but do not experiment; and then there are experimental physicists who experiment, imagine, deduce, and guess [14]. Two fundamental questions, 1.What is a science ?. 2.What is an Engineering?. Already science is defined above, An Engineering can be define the purposeful use of science. And the duty of engineer is to simplify the things. Today we come crass a lot of things are simplified, like advanced Android mobiles can be used by ordinary persons. That means the internal circuit of mobile is complex but to use it ,there is need not know about its internal structure, because those are user guided. 3.What is meant by SCADA? In general SCADA systems are used to monitor and control equipment in industries such as telecommunications, water and waste control, energy, oil and gas refining, transportation and Medical. These systems encompass the transfer of data between a SCADA central host computer and a number of Remote Terminal Units (RTUs) and/or Programmable Logic Controllers (PLCs), and the central host and the operator terminals. A SCADA system gathers information (such as where a leak on a pipeline has occurred), transfers the information back to a central site, then alerts the home station that a leak has occurred, carrying out necessary analysis and control, such as determining if the leak is critical, and displaying the information in a logical and organized fashion. Gajjala Ashok 1 M. Lakshmipathy 2 T Siva Kumar 3 K Karthik 4 3289 International Journal of Engineering Research & Technology (IJERT) Vol. 2 Issue 10, October - 2013 ISSN: 2278-0181 www.ijert.org IJERTV2IS100986