. Now we are ready to use the autorouter . Left-click on the autorouter button on the bottom of the toolbar at the left. You will be prompted with the window shown below. Be sure to match the Routing Grid selection with that specified earlier. Click on OK to begin the autorouting process.
Your finished board should resemble the one shown below. With more complicated boards, the autorouter will not be able to complete every single connection. The remaining connections are left up to the user to finish manually. Also, the router will sometimes layout connections with 90 degree angles. A good rule of thumb in PCB design is to have all routes bending at 45 degrees. To practice manually routing a connection, let's first get rid of the connection that was created at 90 degrees. To do this, select the ripup button from the toolbar on the left and click on the two lines shown below with an arrow.
Your board should now look like the one below.
To route this connection manually, select the Route button from the toolbar on the left. To route at 45 degree angles, you must select the appropriate Wire Bend from the toolbar at the top (select the one that is second from the left _/). Also, you want to use a route that is the same width as the other traces on your board. Select the drop down bar next to Width and select 10 mil. Now, left-click on one end of the thin yellow wire on your board and move up to the other end of the yellow wire, while at the same time creating a connection of 45 degrees. Your new route should look like the one shown below. One last piece of useful information for laying out and routing your PCB is using vias. Vias are through-holes which connect routes on the top and bottom layers. To demonstrate their usefulness, lets delete the route we just created using the ripup tool. Again with the simplicity of this board, there was no need for vias, but let's create a case where there would be. Suppose we want to create the connection shown below.
Start by selecting the Route button from the toolbar at the left. And if we started out with a route on the Bottom
- Fall '14
- web site, Printed circuit board, EAGLE Layout Editor, boondog web site