How to Create PCB Assembly Drawing in Eagle?

2017-05-19 09:55:58 zhengxiaowei 491

EAGLE’s board designer is where a good portion of the magic happens. It’s here where the dimensions of the board come together, parts are arranged, and connected by copper traces. In the board editor, the conceptual, idealized schematic you’ve designed becomes a precisely dimensioned.

PCB Assembly Drawing in Eagle

Process overview:

Prepare the design.

Create Gerbers, generic files accepted by any PCB fab house.

Layers Overview

PCB composition is all about layering one material over another. The thickest, middle part of the board is a insulating substrate (usually FR4). On either side of that is a thin layer of copper, where our electric signals pass through. To insulate and protect the copper layers, we cover them with a thin layer of lacquer-like soldermask, which is what gives the PCB color (green, red, blue, etc.). Finally, to top it all off, we add a layer of ink-like silkscreen, which can add text and logos to the PCB.

EAGLE’s Layers

The EAGLE board designer has layers just like an actual PCB, and they overlap too. We use a palette of colors to represent the different layers. Here are the layers you’ll be working with in the board designer:

1\Complete major design of your printed circuit board. Use EAGLE to draw and check your schematic, create a board, place the parts where you want them, route the signals and finalize the design.

2\Open the "CAM Processor" menu and select "GerberAuto" to generate the basic board shape information your manufacturer needs if he is not set up to read the EAGLE file directly. Gerber is an industry-standard file format.

3\Open the "Layout Editor" and click on the "Options/Set/Drill" dialog. Use the tools to place different kinds of drill marks for your board. This plan tells a manufacturer where to drill holes for placement of screws and other parts on your circuit board. Save the drill information in "Excellon" format.

4\Open the "Schematic Diagram Editor," click "Run" and select "Bom.ulp." Compile notes about what board material to use, how many layers your board has and what parts are needed. Save this file.

Create gerber files

Gerber files are the PDFs of PCBs. Gerber files describe a PCB exactly as it should appear, agnostic of the display hardware. It’s a final production format that isn’t intended to be edited. We created our gerber files in Eagle using the procedure outlined in SparkFun’s Eagle tutorial.

The Eagle CAM processor writes gerber files, open it from the menu under File->CAM processor.

SparkFun has a script (CAM) that configures the CAM processor to make gerber files. Load the CAM script using File->Open->Job…

By default, SparkFun’s silkscreen configuration only includes the place layer. Our parts usually have labels on the names and docu layers, activate these layers on the top and bottom silkscreen tabs to add them to the output.

Click Process Job to create the gerber files.

The CAM processor creates seven files that we need.

Top and bottom copper (.GTL, .GBL)

Top and bottom solder mask (.GTS, .GBS)

Top and bottom silkscreen (.GTO, .GBO)

Drill file, 2.4 leading (.TXT)

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