Transcript Document
EAGLE CAD Instructor: Ted Markson Lecture Goals Learn basics of using the schematic editor, board layout, library editor and CAM processor specific to EAGLE Learn common practices for creating schematics and printed circuit boards 2 EAGLE CAD with Ted Markson 7/20/2015 Introduction to Printed Circuit Boards (PCBs) Used for complex or inconvenient circuits When there are more than 20 jumper wires on a breadboard Thru-hole and Surface Mount technologies Production PCB runs are proportionally inexpensive Always prototype the design! Saves money in the long run 3 DorkbotPDX and BatchPCB by Sparkfun are prototype pooling services EAGLE CAD with Ted Markson 7/20/2015 The Software We will demonstrate the editor applications of EAGLE during each of the description slides. 4 EAGLE CAD with Ted Markson 7/20/2015 General Notes Script that runs at startup of every EAGLE instance eagle.scr Sets options such as default values and command assignments Use this to customize your user experience. The SCR file can be transferred to another computer A full mouse is highly recommended. Laptop touch pads are cumbersome to use effectively 5 Left click usually applies a tool to the target Middle click performs panning Scroll wheel performs zooming Right click shows or cycles through options EAGLE CAD with Ted Markson 7/20/2015 HELP command When in doubt, use the HELP command Exquisite documentation for every available command Tool parameters and behaviors can all be found in HELP Syntax help <topic name> Examples 6 help move help grid help drc help symbol EAGLE CAD with Ted Markson 7/20/2015 Schematic Editor Used to symbolize your circuit design Basic components are devices, nets, labels, buses Use large fonts and right-angle nets More Metadata is More Better Add author, date, production info, etc Work on a 100 mil grid 7 1 inch = 1,000 mil EAGLE CAD with Ted Markson 7/20/2015 Electrical Rules Check (ERC) Used to check a schematic for consistency Produces errors regarding number and connection of 8 Parts/elements Nets/signals EAGLE CAD with Ted Markson 7/20/2015 Board Layout Editor Used to layout your physical circuit design Basic components are packages, traces, geometry Geometry includes polygons, lines, and labels In general… Use oblique-angle traces Use 2+ electrically isolated mounting holes Use vias for accessing traces Consider design requirements for each package Buffer zones, ground planes, clean voltages, etc Treat any non-production design like a prototype Work on a 10 mil grid 9 1 inch = 1,000 mil EAGLE CAD with Ted Markson 7/20/2015 Library Editor (.lbr) Used to design devices Basic components are symbols, packages, devices Use practices from both board and schematic editor Naming conventions A device is a symbol connected to a package Packages have names common within the industry Symbols and devices usually named with part number Prefixes: R, C, IC, X, Q Use Descriptions! 10 Put part numbers, suppliers, and unique information into the device description for reference.You’ll thank me later. EAGLE CAD with Ted Markson 7/20/2015 CAM Processor (.cam) Used to export machine-readable files of your design Most commonly used for Gerber exports CAM job output is sent to manufacturer Review your Gerbers using a Gerber viewer such as http://circuitpeople.com 11 EAGLE CAD with Ted Markson 7/20/2015 Questions? 12 EAGLE CAD with Ted Markson 7/20/2015