Free Software {{ :qelectrotech-fin-1_1.jpg?100|}} presentation qelectrotech  {{ :qelectrotech-fin-1_11.png |}}    Sofiane Ait Chabane & Robert Saint-Fort   Summary  Under EU Free Software , we discover a multitude of free software in the field of electrical engineering but also more general science. Work under Linux made the experience much more interesting .  In our turn , we will be presenting qelectrotech , a simple tool for mapping electrical circuits. The result is a remarkable graphic quality that makes possible the operation , including educational purposes.   Abstract Within the unit of Free Softwares , We Have Discovered many free tools and softwares related to electrical engineering goal aussi more general scientific domains . Working on a Linux environment made ​​the experience even more interesting. In turn , we will present qelectrotech , a single mapping software for electrical circuits. The results show a remarkable That makes the graphic quality can use in educational purposes.        "Teaching a non-free program returns to teach dependence , which is contrary to the mission of the school " - Richard Stallman   introduction It was in 1984 that the free software movement was born , headed by researcher Richard Stallman followed by a handful of programmers. Opposed to the restrictive policy source code , they are expressed for a free user access to programs. Free software gives users the freedom to run , copy, distribute, study, change and improve the software . Qelectrotech is a program under GNU / GP is free and open . It is specially designed to make the electrical mapping oriented electrical and power electronics , no simulation or calculations. Its simplicity and practicality make it a must for any electrician software. A. Interface Overview  {{ :qelectrotech-fin-3_13.jpg|}} TEQ interface is simple and easy to use . At the top is the menu bar . It provides access to many functions : creating project files , editing, etc. preferences . The work area is to the right , this is where they deposit items, and link them to form the pattern. The left side gives access to two components: the first is the " panel elements ", which includes the current project , the associated diagrams, all projects of the user, mainly collections of components. The first is the common collection provided by default , the second is that of combining its components created by user himself same or imported from outside . The second 'Cancellation' pane displays a list of all the shares of companies changes and cancellations in the diagram. At the bottom of the work area are editable elements of cartridge. Note that in the current version , support is not available , however explanations are available on the website of the software.   B. features We will explore the features of TEQ through a small example schema : Industrial Process . 1 . Creating a project {{:qelectrotech-fin-4_14.png?100|}} Press this icon to create a new project. Note that TEQ can handle multiple projects simultaneously , and each project can contain multiple schemas .   {{:qelectrotech-fin-4_15.png?200|}} By clicking on Project in the menu bar we can add a diagram to remove , to clean . It is necessary to change the project properties to properly define and to work as desired. We will go back the project name , size patterns , the type of driver to use (single or multi-wire ) , date etc. . Projects are saved in a file . Qet incorporating all the parameters of the project, diagrams with all components .   {{ :qelectrotech-fin-5_16.jpg |}} 2 . Make a diagram  a. Submit a component and annotate {{ :qelectrotech-fin-5_17.png |}} Make a diagram TEQ is so quick and easy : just locate the component to be used in the panel and then click on elements by drag / drop in the work area . After moving the desired component You can annotate by double clicking on empty fields provided for this purpose . The components can be rotated , deleted, copied , or by clicking above with the right mouse button or by using shortcuts . {{:qelectrotech-fin-5_18.png?200 |}} {{ :qelectrotech-fin-5_19.png?200 |}} Text can be inserted by clicking the icon at the top right                                                                                            b . Wiring components To connect a component to another , simply position the mouse over the component terminal and "pull "Until the arrival terminal . If you want to connect a third component after the second , simply not click on the link already drawn but on the terminal of the first element as shown below if . The connection point will automatically .   {{ :qelectrotech-fin-6_20.jpg |}}                     In case of son would overlap , as shown below , it is sufficient to click a son concerned, it becomes red and can then be shifted so as to be distinguished from the other thread .     {{:qelectrotech-fin-6_22.png|}} {{ :qelectrotech-fin-6_21.png|}}      3 . Printing diagrams and export  Once the plan is finalized, we can TEQ is : - D e launch direct printing or save as PDF or Postscript via print icon {{ :qelectrotech-fin-6_23.png|}} {{ :qelectrotech-fin-7_24.png |}} To export the drawings to an image file (JPEG , PNG , Bitmap and SVG ) via " File " in the menu bar .  {{ :qelectrotech-fin-7_25.png |}} The image size can be changed, security settings , format, options also made . 4 . Edit an item Here is one of the strengths of this software and free software in general : The freedom to adapt software according to these needs. Among these requirements , the user can for example edit a component provided by default. Note that this is only possible for the system administrator , other users can not modify shared content between different sessions . Edit component is as follows : Click the right mouse button on the target component in the Panel elements . Select "Edit element". We took the example of a simple circuit breaker that we want to edit. It can be selected either in the collection of components , or if the pattern is already .   {{ :qelectrotech-fin-8_26.jpg |}} Several geometric shapes can be added from the toolbox basic element " terminal " must be used by all components against . Care must be taken to adapt the framework to the size of the component {{ :qelectrotech-fin-8_27.jpg|}} avoid some display problems due to a disproportionate scale. The button display in configuration displays all the parameters characterizing a piece of the scheme: The color, position, orientation , etc. and modify them if necessary . This version of TEQ adds , adjust elements freely pixel by pressing the Ctrl key during the operation.      5. Creating a new element TEQ provides the ability to create yourself a new item. To do this, simply click on the icon   A window appears, in laqelle must be specified category where the element is created , its name ( including language ), the dimensions of the new element and the point of entry of the element with the mouse , and finally the possible orientations. The design of the new component is exactly the same as for editing. The official website of qelectrotech provides a space for exchanging elements for user community.   C. Conclusion  We discovered a more free software in the field of Electrical Engineering . Qelectrotech is a young but very promising free software as evidenced by the notoriety he already bénificie within academic and professional electrical engineering. The number of developers increases dramatically , and major improvements are planned , both in terms of functionality in terms of graphics .                             references http://fr.wikipedia.org/wiki/QET_ ( qelectrotech ) http://fr.wikipedia.org/wiki/Logiciel_libre http://qelectrotech.org/   nomenclature Qelectrotech 0.22 Original Idea : Benedict Ansieau Programming: Xavier Guerrin Translated into English, Spanish, Russian , Portuguese and Czech. GNU / race license