Last time we spoke about Eagle, the most used software in the field of drawing Electronic schematics.
Today I will show you an easy way to use this one; I hope that way to be simple and clear for all off you.

Create new project
Start up the Eagle control panel, and right-click on "projects" to create a new project.
You'll get to name it whatever you want
 
Create new schematic in the project
Once you have created the new project, it will be "opened" automatically (which doesn't do much other than tell EAGLE that "this is the current project".) Right click on the new project and follow the popup menus to create a new schematic.

Find and place ("add") components

Components are added to a schematic from the ADD dialog, which you get to by clicking the ADD button over on the GUI menu.

Most used library

The most useful libraries are :

  • supply 1
  • supply 2
  • rcl
  • con-amp-mt
  • linear
  • led
  • rectifier
  • transistor
  • trafo

Different elements in the "add" command


"Drop" used to hide unnecessary libraries

Neaten things up

We can make things a bit neater by moving some of the components, junctions, and wires around just a BIT using the Move button. When you select an object after clicking the move button, the object gets attached to your mouse pointer and behaves like when you were adding objects with respect to the other mouse buttons.

Re-zoom the drawing

Since we have all the components added, we can use the zoom-to-fit button to fit things better in our window...

 

Wiring components

Now it's time to make wire between components, find "Wire" to start

When you finish making wire between two components, hit "Escape" in the keyboard to move to the next one

Do Rule Check!

The button shown does an electrical rule check. It will check whether the pins designated outputs are connected to inputs, whether there are obvious missing junctions, and stuff like that.

Fix Errors and Warnings

When we run it on our schematics so far, we get a warning that the junction are missing. We could fix that with the name command, or just leave it as is.

In general, you don't have to FIX every warning that shows up in a rule check, but you should understand what the complaint is, and have a good justification WHY you don't need to fix it.

Apply component values

When we plopped down the components during the "add" phase, we didn't assign specific values to any of them. Some of the components have inherent values that don't need to change. But the resistors, capacitors, and diodes should all have their values filled in appropriately.

Values are assigned using the "Value" button. After selecting the button, click on each component near its origin (little "+" sign), and you should be presented with an opportunity to change the value.

Save your work often

Now is a good time to save our work. This is where you get to attach a name to your schematic,

as well. You might need to use "save as" for your first save, to prevent it from saving "untitled.sch".

 

 

Transform the schematic into board

After finishing and saving your schematic, now we can move to the next step which is to move to board drawing by using "Board" as shown here in the picture.

Rearrange your components

Use "move" and the right-button of the mouse to rearrange your circuit on the board

Autorouter

After rearranging your circuit , just go to "Tools / Auto"

 

For the preferred directions leave them as shown in picture

Then hit "OK"

The job is done

You can add some modification on the route.
your circuit is ready, save your work as usual and print it if you want

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