layer (left-click the drop down box at the top left and select Bottom ), we would create a short when passing over the first trace. However, if we created two vias, we could bypass this trace and finish our route.
To finish this route we need to create two vias. While in the middle of manually routing on the bottom layer, select the layer drop down box at the top left and choose Top . This will automatically place a via at the specified location and will also change your route from the bottom to the top.
Once passing over the blue trace, change your layer again from Top to Bottom and make the connection with the appropriate trace. Your finished board should look like the one below.
Finally, one last step before generating your PCB gerber files is to check over everything. EAGLE PCB provides two nice tools for this: Electrical Rule Check (ERC) and Design Rule Check (DRC) . Generating Gerber Files The final step in completing your PCB design is to generate the Gerber files. These are the files used by companies to fabricate your PCB. I order PCBs from AP Circuits so this part of the tutorial will be tailored towards their requirements. The first step to creating your Gerber files is to start the CAM Processor by clicking the CAM button in the top toolbar. You will see the following window pop up. First, you want to change the Device to Gerber_RS274X . Next based on the table below, enter the file extension in the File box and make sure the corresponding layers are highlighted in the box at the right. Then select Process Job to generate the corresponding files. Repeat this 4 times for each file listed in the table below. The final step is to create the NC drill file. Change the Device to Excellon and turn the Drills and Holes layers on and everything else off. Type in .ncd in the file box and select Process Job . This completes the last step of PCB design. You now have all the files necessary to send your board off to fabrication!! This tutorial was created by B. Green: home page
- Fall '14
- web site, Printed circuit board, EAGLE Layout Editor, boondog web site