| Parameter | Value | |-----------|-------| | Microcontroller | ATmega32U4 | | Operating Voltage | 5V (or 3.3V variant) | | Clock Speed | 16 MHz (5V) / 8 MHz (3.3V) | | Board Dimensions | 33mm x 18mm (approx) | | Mounting Hole Diameter | 2.5mm (two holes) | | Pin Count | 18 + 4 mounting holes (usually 12 on each edge) |
The Arduino Pro Micro Eagle Library typically includes:
Popular sources for the library include: arduino pro micro eagle library
The Arduino Pro Micro Eagle library provides ready-to-use schematic symbols and PCB footprints for the Arduino Pro Micro (commonly based on the ATmega32U4). It streamlines designing custom PCBs that integrate the Pro Micro module by ensuring correct pin mapping, footprint dimensions, and recommended clearance for headers and USB connector.
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 | Popular sources for the library include: The Arduino
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 |
Pad 27 (second RST) is often omitted in many Pro Micro layouts – check your variant. This defines the logical connections
| Issue | Solution |
|----------------------------------------|--------------------------------------------------------------------------|
| Pins are swapped (D2 vs D3) | Double-check pin mapping against official Pro Micro pinout diagram. |
| Footprint does not match actual board | Verify dimensions: 33.0mm × 17.8mm. Some clones are slightly different. |
| No USB connectivity after assembly | Ensure D+ and D- are not connected – they go directly to onboard USB. |
| EAGLE cannot find library | Check library path; use Use command in Schematic Editor. |
| DRC errors with silkscreen | Reduce silkscreen width to 0.15mm or move outline to tPlace layer. |
This defines the logical connections.
| Parameter | Value (mm) | |-----------|------------| | Board width | 18.0 | | Board height | 33.0 | | Pad length | 1.5 | | Pad width | 0.8 | | Pad pitch (edge to edge) | 2.54 (0.1") | | Hole diameter (pads) | 0.9 | | Mounting hole diameter | 2.5 | | Mounting hole position (from top edge) | 2.5 mm | | Mounting hole X offset from center | ±7.5 mm |