Tutorial EAGLE 4.1 -- 2nd edition - Cadsoft

EAGLE-Tutorial Version 4.1
12 Drawing a Schematic
In this section you will learn how nets and buses are used in a drawing. You
will then be able to create a schematic.
To create an empty schematic, open a new drawing and enlarge the editor
window.
Grid
The standard grid for schematics is 0.1 inches. Symbols should be placed on this
grid or a multiple of it, since otherwise it can happen that nets cannot be connected
to the pins.
Set the alternative grid to 0.25 inch. This would allow to adjust, for example,
labels in a finer grid which will be activated by pressing the Alt key.
Adding a Frame to a Schematic
As a start, select a drawing frame from the library frames.lbr, which contains
predefined frames in miscellaneous formats.
• ADD, and enter the word letter or frame in the search field. Select a suitable
frame and • • for example LETTER_P. A frame which fits on a letter format
page (portrait) is now attached to the cursor.
If you cannot see it completely, press function key F4 until it matches your
screen, then place it with a click of the left hand mouse button so that its
lower left corner is placed on the coordinates (X=0, Y=0).
Now a further frame is attached to the cursor. Click the icon with the stop
sign to terminate the ADD command. Press Alt+F2 to show the frame in
full size or click the Zoom-to-fit icon in the action toolbar.
Adding and Changing Text
You can add lines, text and other objects to predefined frames and text
fields in the library. Or you can design and save your own frames.
Variable texts, e.g. the project title or the revision number, can be inserted
directly in the Schematic Editor where you are now.
Frames are saved as symbols in the library, therefore it makes sense to
write the text in layer 94, Symbols.
Now bring the frame text field into the editor window so that it is completely
visible. Next click the icon for the TEXT command and enter the
following text
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