Once the library is installed, follow these steps to integrate the Pro Micro as a module in your PCB:

Manually creating a Pro Micro library is tedious and error-prone. Instead, use a community-tested library:

If you prefer to build your own library (good for learning or custom pin mapping), follow these steps:

| 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 |

| 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 |