Arduino Pro Mini XL
michpro·Arduino_Pro_Mini_XL
About the Arduino Pro Mini XL PCB
Arduino Pro Mini XL is an open source AVR/Arduino PCB design by michpro, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 18.5 × 33.3 mm, with 14 components from 10 distinct parts.
Its main chip is the ATMEGA1284P-MU, from the AVR/Arduino family. By type, the board carries 7 capacitors, 2 resistors, 1 IC, 1 crystal, 1 switch and 1 diode.
It belongs with the usb & debug tools designs in this gallery.
From the project
ATmega1284P uC module in Arduino Pro Mini format
- Arduino Pro Mini XL - Overview - Features - Schematic diagram - Module visualisation - Assembly - Production files - Software Compatibility - Installing MightyCore - Getting Started - Burning the Bootloader - Troubleshooting - Physical Specifications - Reporting bugs - Acknowledgments - License - Support
The Arduino Pro Mini XL is supported by the Arduino IDE through the MightyCore board package, which provides board definitions for the ATmega1284P.

Main components on the Arduino Pro Mini XL
Arduino Pro Mini XL bill of materials (BOM)
14 components, 10 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATMEGA1284P-MU ATmega1284P-MU | QFN-44-1EP_7x7mm_P0.5mm_EP5.2x5.2mm | U1 |
| 1 | 20MHZ 20MHz | muRata-resonator_SMD_CSTCExxM00G55-R0 | Y1 |
| 1 | C455280 Reset | SW_SPST_EVQPE1 | SW1 |
| 1 | LED | LED_0805_2012Metric | D1 |
| 1 | 10UH 10uH | L_0805_2012Metric | L1 |
| 1 | 10U 10u | C_0603_1608Metric | C1 |
| 5 | 100N 100n | C_0603_1608Metric | C2, C3, C4, C6, C7 |
| 1 | 100N 100n | C_0805_2012Metric | C5 |
| 1 | 10K 10k | R_0603_1608Metric | R1 |
| 1 | 1K5 1k5 | R_0603_1608Metric | R2 |
Arduino Pro Mini XL design files
The KiCad project lives in the michpro/Arduino_Pro_Mini_XL repository on GitHub; these links point at the commit this page was built from.
Arduino Pro Mini XL: common questions
What microcontroller does the Arduino Pro Mini XL use?
The Arduino Pro Mini XL is built around the ATMEGA1284P-MU, from the AVR/Arduino family.
How big is the Arduino Pro Mini XL PCB?
The Arduino Pro Mini XL measures 18.5 × 33.3 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Arduino Pro Mini XL?
14 components, from 10 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Arduino Pro Mini XL design files?
From the michpro/Arduino_Pro_Mini_XL repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Arduino Pro Mini XL design in my own project?
Yes, under the terms of its CERN-OHL-P-2.0 license, which michpro chose for the repository.
Can I test firmware for the Arduino Pro Mini XL without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
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