Arduino+pro+micro+eagle+library [upd] [ 99% Essential ]

Designing with the Arduino Pro Micro: A Guide to Eagle PCB Libraries

2. Arduino Official GitHub

While Arduino focuses on the Uno and Mega, their official "Hardware" repository contains updated libraries for the Leonardo (which shares the 32U4 core). You can derive the Pro Micro from these files with minor tweaks. arduino+pro+micro+eagle+library

SparkFun-Boards Library: This is the most widely cited and used library for the Pro Micro. Since SparkFun originally designed the Pro Micro, their library includes the most accurate footprints and schematic symbols. Designing with the Arduino Pro Micro: A Guide

file contains footprints for the Pro Micro (3.3V and 5V versions). Element14 Community Library: arduino+pro+micro+eagle+library

The "Pro Micro" was originally developed by SparkFun Electronics, and its official Eagle files are widely considered the industry standard.