Eagle CAD

• Autodesk Eagle Tutorials
• Fab academy Introduction to Eagle
• CBA Fab Eagle library
• Fab Eagle new Libraries
• Eagle Alignment tools
• Gerber viewer
• Tutorials
  • Eagle tutorial Jeremy Blum
  • Designing SMD foot prints Eagle
  • Sparkfun Custom footprints
  • Sparkfun Eagle schematic
  • Sparkfun SMD advanced
  • Sparkfun creating a new eagle part
  • Programming AVR-1 series Yuichi
  • MegaTinycore
  • UPDI Yuichi
  • Double side PCB Sibu

• PCB layout
  • Sparkfun PCB layout
  • layer Tdocu shows where the actual components sit on the foot print, change to a bright colour to see them.
  • Define net classes to give separate routing conditions for each class of components like the power and signal traces.
  • A trace with many right angles in them will tend to round the edges of a square wave signal and will cause the microcontroller to not read them properly. This is a probabilistic issue, may not happen.
  • Its not good practice to put capacitors in an array far away from the microcontroller, you want to keep the traces short.
  • when feeding power, you want to keep the input power supply stack to one side and feed all the components in a star configuration.
  • Watch for ground return paths, its the path the current takes to get back to the regulator/supply, if you have a lot of traces in the bottom, some can create pinch points in the ground plane. Need to take care for high current paths.
  • Try to lay all the signal traces first on the top layer, and gnd layer on botton. if four layer board, then signal, gnd, vcc, bottom layer.
• Workflow
  • New Project > New schematic
  • Add components from Libraries, move rotate, copy them.
  • Use net tool to link components
  • Smash tool to edit the positions of the labels
  • put values in the label to define them.
  • Use Alt to move in finer spacing.
  • F7 to use the move command
  • F4 to go to name mode
  • F5 to go to value mode
  • F8 rats nest
  • F9 route
  • Alt+F9 ripup
  • Click an air wire and click ‘i’ to get the properties, you can disable air wire if needed.
  • When routing hold the shift key and click to drop a via, use the middle mouse button to drop to the bottom of the layer
• Selecting overlapping layers in board view, left click to select, right click to alternate between parts.
• Routing, to get a via, start a trace and change layer manually or use the middle mouse button.
• After routing, click ratsnest and check bottom status, it should say noting to do.
• To make a ground pour, draw a polygon next to the dimension line, use the isolate settings at the top to adjust the clearance, and use the name tool to name it as GND, last-click ratsnest to fill the ground pour. Good practice to have ground pours on both sides of the board.
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tags design Electronics Mechatronics Mechatronica M10V pick and place Eagle CAD