Never guess component dimensions. Open the manufacturer datasheet and locate the or Land Pattern dimensions. Note the pad spacing (pitch), pad width, and hole diameters. Step 2: Set Your Grid

Think of a macro as a "rubber stamp" for your PCB. Instead of manually placing four pads, drawing an outline, typing "C1," and drawing connecting tracks every time you need a specific IC or connector, you can simply stamp a pre-made macro.

Then he remembered the macros.