| Symbol Pin | Package Pad | Signal | |------------|-------------|--------| | RAW | 1 | RAW | | GND1 | 2 | GND | | RST1 | 3 | RST | | VCC | 4 | VCC | | TX | 5 | TX | | RX | 6 | RX | | GND2 | 7 | GND | | SCL | 8 | SCL | | SDA | 9 | SDA | | A3 | 10 | A3 | | A2 | 11 | A2 | | A1 | 12 | A1 | | A0 | 13 | A0 | | D15 | 14 | D15 | | D14 | 15 | D14 | | D16 | 16 | D16 | | D10 | 17 | D10 | | D9 | 18 | D9 | | D8 | 19 | D8 | | D7 | 20 | D7 | | D6 | 21 | D6 | | D5 | 22 | D5 | | D4 | 23 | D4 | | LED | 24 | LED | | D12 | 25 | D12 | | GND3 | 26 | GND |
Imagine building a custom 8-key macro pad. With the Pro Micro Eagle library:
An EAGLE library consists of three main components:
| Component | Purpose | |----------------|-------------------------------------------------------------------------| | Symbol | Schematic representation (pins, labels, function) | | Footprint | PCB layout pattern (pads, holes, silkscreen, dimensions) | | Device | Binds symbol to footprint, defines package variants (e.g., SMD, through-hole) |
For the Pro Micro, the library typically treats the board as a component (a sub-circuit module) rather than re-drawing the ATmega32U4 and its support circuitry.
Left edge (X = -9.0 mm) | Pad # | Y (mm) | |-------|--------| | 1 | +15.0 | | 2 | +12.46 | | 3 | +9.92 | | 4 | +7.38 | | 5 | +4.84 | | 6 | +2.30 | | 7 | -0.24 | | 8 | -2.78 | | 9 | -5.32 | | 10 | -7.86 | | 11 | -10.40 | | 12 | -12.94 | | 13 | -15.48 |
Right edge (X = +9.0 mm) | Pad # | Y (mm) | |-------|--------| | 14 | +15.0 | | 15 | +12.46 | | 16 | +9.92 | | 17 | +7.38 | | 18 | +4.84 | | 19 | +2.30 | | 20 | -0.24 | | 21 | -2.78 | | 22 | -5.32 | | 23 | -7.86 | | 24 | -10.40 | | 25 | -12.94 | | 26 | -15.48 | arduino pro micro eagle library
Pad 27 (second RST) is often omitted in many Pro Micro layouts – check your variant.
Pro tip: The library often includes two variants – one with male pin headers (for soldering to a carrier board) and another with female headers (for plugging the Pro Micro in like a module). Choose carefully based on your assembly method.
After creating the library:
Arduino Pro Micro Eagle Library Report Arduino Pro Micro Go to product viewer dialog for this item.
, based on the ATmega32U4 microcontroller, is a staple in compact electronics design. Integrating this board into custom PCB layouts requires a precise Autodesk Eagle library to ensure proper footprint and pin alignment. Core Specifications Microcontroller: ATmega32U4 (16 MHz) Operating Voltage: 5V or 3.3V variants Digital I/O Pins: 12 (5 with PWM) Analog Inputs: 4 Form Factor: 24-pin DIP-compatible footprint Dimensions: Approximately 1.3" x 0.7" (33mm x 18mm) Key Library Features
Schematic Symbols: Visual representation for circuit design. PCB Footprints: Accurate 0.1" pitch header spacing. | Symbol Pin | Package Pad | Signal
3D Models: Often included for STEP file exports (in advanced libraries).
Pin Mapping: Clearly labeled RX, TX, VCC, and GND pins to prevent wiring errors. Installation Guide
Download: Obtain the .lbr file from a trusted source like the SparkFun Eagle Library.
Move Files: Place the file into your Eagle libraries folder (typically found in Documents/EAGLE/libraries). Activation: Open Eagle.
Go to Options > Directories to ensure the library path is correct.
In the Control Panel, right-click the library and select Use. Left edge (X = -9
Refresh: Use the refresh command in the schematic editor to make the library visible in the "Add Part" menu. Design Considerations
USB Clearance: The Micro-USB connector adds roughly 0.07" to the board's total length.
Header Height: Consider clearance if stacking components above the Pro Micro.
Voltage Selection: Ensure the library footprint matches your specific 3.3V or 5V hardware version, as pinouts can occasionally vary by manufacturer. Arduino Micro without Headers | Compact USB Dev Board
Creating a custom Eagle library (.lbr) file for the Arduino Pro Micro can be done in two ways: creating the file manually using the XML code below, or following the design steps to build it from scratch in the Eagle editor.
Here is a complete piece containing the Source Code for the library and a Step-by-Step Guide on how to implement it.
Manually creating a Pro Micro library is tedious and error-prone. Instead, use a community-tested library:
| Mistake | Consequence | |---------|-------------| | Swapping left/right edge | Board reverses in layout | | Forgetting GND connection | Unreliable operation | | Using wrong pin numbering | Mismatch with Arduino IDE | | Omitted mounting holes | Cannot secure board physically | | Confusing RAW vs VCC | Can damage board if 12V applied to VCC |