LaTeX/C3/Feedback-control-diagram/English-timed
From Script | Spoken-Tutorial
| Time | Narration |
|---|---|
| 0:00 | Welcome to the spoken tutorial on feedback diagram creation using Xfig |
| 0:07 | In the spoken tutorial on block diagram creation, We created the diagram shown here |
| 0:14 | We will refer to it as the blocks tutorial |
| 0:18 | Please master the blocks tutorial before starting the current one |
| 0:22 | In this tutorial, we will explain how to create block diagrams of the type shown on this page |
| 0:31 | I shall use Xfig, version 3.2, patch level 5 |
| 0:37 | We will begin with block.fig created in the blocks tutorial |
| 0:43 | Let us go to Xfig |
| 0:47 | Let us choose the file, then open. |
| 0:52 | In the entry box, we can enter “block” and press open.Or double click on “block.fig”. |
| 1:04 | Using the “save as” option on “file”, we will save this figure as feedback. |
| 1:24 | We now have the file feedback.fig |
| 1:28 | Let us put the grids on by clicking on the “grids” |
| 1:34 | The scroll bar on the right can be used to move the canvas up or down. |
| 1:41 | The role of each mouse button is shown on the top right hand side. |
| 1:46 | This role depends on the activity. |
| 1:49 | To illustrate this, let me take the mouse to the vertical “scroll bar”. |
| 1:55 | Observe the comment next to the left button. |
| 1:59 | I cannot move the mouse to show this. It is because, the role of the buttons will change if I move the cursor away from the scroll bar. |
| 2:08 | The “left button” moves the canvas up and the “right button” moves it down. |
| 2:17 | Instead of clicking the left or right button, we can also click the “centre button”, hold and drag the canvas up or down |
| 2:31 | In a similar way, you can move the canvas to the right or left, using the “scroll bar” on the top. Left, right |
| 2:44 | I will now move the box to the centre by clicking the “middle button”, holding and dragging the canvas to the centre. |
| 2:57 | As I release the mouse, the box gets moved to the centre. |
| 3:03 | Let us now create the feedback diagram starting from this block. |
| 3:08 | Let us copy this box. |
| 3:13 | Click on the box and select it. |
| 3:16 | Move the mouse to the new location and click. |
| 3:27 | Let us now put some text. |
| 3:29 | Let us click the “Text box”, indicated by T, from the left hand side panel. |
| 3:37 | Let us choose the size of the text. |
| 3:43 | Move the mouse to the value box and enter 16. |
| 3:51 | Click “Set”. |
| 3:53 | Let us click the “Text Just” button in the attributes panel. |
| 4:02 | Let us choose centre alignment. |
| 4:05 | Let us click at the centre of the first box. |
| 4:11 | Sorry, I did not choose the correct position. |
| 4:15 | I will click at a different location to move the cursor away. |
| 4:19 | I will then click at the correct position. |
| 4:27 | Let us now type the text “Control” and click the mouse. |
| 4:35 | We would now want to enter some more lines with arrows. |
| 4:40 | Let us choose the “polyline button” |
| 4:43 | Let us select the “Arrow Mode” button from the attributes panel and select the second option. |
| 4:53 | Let us click the “Arrow Type” button and an arrow head. |
| 5:00 | Let us click at the point where we want the line to start. |
| 5:08 | Let us move the mouse to the end point of the desired line. |
| 5:14 | Let us now click there with “middle mouse button”. |
| 5:20 | The line is created with an arrow. |
| 5:25 | I want to place a circle. |
| 5:27 | Let us choose the “circle on the left” from the “left hand side panel”. |
| 5:33 | We will place it to the left of the first box. |
| 5:37 | Click the mouse. As I move the mouse, the circle becomes bigger. |
| 5:47 | When we get the right size, let us release the mouse button. |
| 5:54 | Oops, the circle is larger than what I wanted. |
| 5:57 | I can undo this operation, using the edit button at the top. |
| 6:02 | We can also delete this object, using the Delete button on the left hand panel. |
| 6:10 | Let us do that now. |
| 6:14 | A skeleton with cross hairs appears. |
| 6:18 | All key points of all objects also appear. |
| 6:22 | Move the cross hairs to a key point that indicates the circle and click. |
| 6:32 | In case a wrong object is deleted, no need to panic. |
| 6:35 | You can undo it: Click the “edit” button, hold, go to “Undo” and release the mouse. |
| 6:44 | If some objects are closely placed, you may have difficulty in choosing them. |
| 6:49 | You can solve this through the “zoom” feature. |
| 6:55 | Click the “View” button on the top left hand side, hold and choose one of the zoom options. |
| 7:00 | Let me release the mouse at “Zoom to fit the canvas”. |
| 7:04 | Now it is easy to discriminate between the objects. |
| 7:08 | Let me delete the circle now. |
| 7:12 | Let me unzoom. |
| 7:20 | I will move the diagram to the centre with the use of scroll buttons. |
| 7:35 | I do not like to leave “delete” symbol on, because I can accidentally delete something else. |
| 7:41 | I can change this by choosing any other button. |
| 7:44 | Let me choose the left circle. |
| 7:47 | Let me redraw the circle |
| 8:00 | I want to put another line from this line. |
| 8:04 | For this, we will first put a “dot” on the line. |
| 8:07 | Let us click the “library” on the left hand side panel. |
| 8:11 | The library is indicated by a stack of books. |
| 8:15 | A “dialog window” opens. |
| 8:17 | Next to the library, it says “None Loaded”. |
| 8:20 | Let us click and hold. |
| 8:22 | A list of available libraries appears. |
| 8:25 | Move the mouse to the “Logic library” and release the mouse . |
| 8:31 | Let us choose the “small dot” by double clicking on it. |
| 8:36 | The “dialog window” gets closed. |
| 8:38 | We see a cross hair, along with the chosen small dot. |
| 8:42 | Let us place the dot on the line by clicking. |
| 8:51 | The cursor and the small dot show up once again, suggesting that we can place it at some other location also. |
| 8:57 | We do not want to place the dot at any other place. |
| 9:00 | Let us close it by clicking the right button of the mouse. |
| 9:05 | The right button does an “undo” operation. |
| 9:08 | In this case, dot selection has been removed. |
| 9:10 | Let us draw a line from this dot to the circle. |
| 9:15 | Let us select the polyline. |
| 9:18 | Notice that the previous selections of “arrow mode” and “arrow type” have been remembered. |
| 9:24 | Within a session, Xfig remembers the parameter values. |
| 9:28 | Click at the dot. |
| 9:34 | Move the mouse to the bottom and click. |
| 9:41 | Now turn the mouse to the left, until at the bottom of the circle. Click. |
| 9:47 | Move the mouse to the circle and now click the “middle mouse button”. |
| 9:54 | Let us draw another line, to the left of the circle by copying. |
| 10:08 | Let us now save this figure using the “file button” at the top left hand corner of Xfig and choosing “save”. |
| 10:19 | Let us now export the file. |
| 10:22 | Let us click the “file” button once again and choose “export”. |
| 10:30 | Let us choose “language” and then “PDF”. |
| 10:36 | We get the file “feedback.pdf”. |
| 10:43 | Let us open this file through the command “open feedback.pdf”. |
| 10:56 | We now have the block diagram that we wanted. |
| 11:00 | We have completed our objective. |
| 11:04 | We have an assignment for you |
| 11:08 | Substitute the blocks with different objects. |
| 11:13 | Try out operations, such as, rotate and flip. |
| 11:19 | View the file feedback.fig in an editor, and identify different components. |
| 11:25 | Using the library, create entirely different block diagrams. |
| 11:32 | Spoken Tutorial is a part of the Talk to a Teacher project Supported by the National Mission on Education through ICT (NMEICT), MHRD, Government of India. |
| 11:44 | More information on this mission is available at |
| 11:53 | We welcome your participation and also your feedback. |
| 11:57 | This is Kannan Moudgalya signing off. Thanks for joining. Goodbye. |
