______  ______ ______   ______   __     ______     ______           ______  _       _ 
(_____ \(_____ (_____ \ / __   | / /    / __   |   (_____ \         |  ___ \(_)     (_)
 _____) )_____) )____) ) | //| |/ /____| | //| |___ _____) )___ ___ | | _ | |_ ____  _ 
(_____ (|  ____//_____/| |// | |___   _) |// | (___)  ____/ ___) _ \| || || | |  _ \| |
      | | |     _______|  /__| |   | | |  /__| |   | |   | |  | |_| | || || | | | | | |
      |_|_|    (_______)\_____/    |_|  \_____/    |_|   |_|   \___/|_||_||_|_|_| |_|_|

RP2040-ProMini Project

The RP2040-ProMini project aims to create a replacement for the Arduino Pro Mini using the RP2040 MCU.

RP2040-ProMini Board

The RP2040-ProMini board is a 4-layer board designed to accommodate the popular Raspberry Pi RP2040 MCU in the commonly used, but obsolete, Arduino Pro Mini footprint.

Preview:

You can view the Schematics in PDF format for detailed information.

STEP 3D files are available with pins and without pins.

Features:

• Arduino Pro Mini compatible pinout
• Partially compatible with Arduino Nano RP2040 Connect pinout
• (v3.x) Detachable USB and JTAG extension board with RESET button
• Dual-core Cortex-M0+ Raspberry Pi RP2040
• Small footprint suitable for DIY projects
• (v1.x) 19 GPIO pins, including 4 analog inputs or (v2.x-v3.x) 21 GPIO pins, including 4 analog inputs
• USB data pins on the side connector
• SWD debugging pins on the side connector
• (v1.x) LDO-based 3.3V power supply with a maximum 16V input or (v2.x-v3.x) Buck-Boost converter based 3.3V power supply with input range of 2.5V-12V
• Supports both SOIC and WSON 16MB flash packages
• Flat back side enables use as a sub-assembly
• Two cut points to reduce power consumption of unused components

CAM files, as well as the BOM and CPL files for JLCPCB, are available.

Board Pinout

Following pinout is used for the board:

Board Pin	RP2040 Pin	Function	Notes
D0	GPIO1	UART0 TX
D1	GPIO0	UART0 RX
D2	GPIO25
D3	GPIO15
D4	GPIO16
D5	GPIO17
D6	GPIO18
D7	GPIO19
D8	GPIO20
D9	GPIO21
D10	GPIO5	SS
D11	GPIO7	MOSI
D12	GPIO4	MISO
D13	GPIO6	SCK	LED
D14 A0	GPIO26
D15 A1	GPIO27
D16 A2	GPIO28
D17 A3	GPIO29
D18	GPIO12	SDA
D19	GPIO13	SCL
D20	GPIO22
D21	GPIO23

Cut Points

There are two cut points on the board to reduce power consumption of unused components.

Cut Point	Function	Notes
CUT_VIN	Separates VIN-to-3V3 power supply with power LED from the rest of the board	This cut point is useful if you want to power the board from 3V3 pin instead of VIN pin.
CUT_LED	Separates LED on pin D13 from the rest of the board	This cut point is useful if you want to reduce power consumption of the board.

Version History

Roughly RP2040-ProMini board exists in three flavors:

• v1.x - this boards are cheaper because they are based on LDO power supply.
• v2.x - this boards are more expensive because they are based on Buck-Boost power supply.
• v3.x - this boards has same basic design as v2.x but includes detachable USB and JTAG extension board.

The development of v3.x boards is happening in master branch, while v1.x and v2.x boards are developed in dev_v1 and dev_v2 branches respectively.

Each board version listed below is tagged in its respective branch and includes all the necessary files to manufacture the board.

v3.2 - 09.02.2024

• Added Gxx pin names on the back of the board.
• Made extension board cut-out openings wider for easier cutting.

v3.1 - 21.11.2023

• Removed pull-up resistor from SWCLK line.
• Added white silkscreen under LEDs to add light reflection.

v3.0 - 29.08.2023

• Added detachable USB and JTAG extension board with RESET button.
• Improved routing a bit.

v2.2 - 01.01.2024

• Added Gxx pin names on the back of the board.

v2.1 - 21.11.2023

• Removed pull-up resistor from SWCLK line.
• Added white silkscreen under LEDs to add light reflection.

v2.0 - 23.07.2023

• Use Buck-Boost converter instead of LDO.
• Added two new digital pins.
• Moved few components around.

v1.3 - 01.01.2024

• Added Gxx pin names on the back of the board.
• Made front and back texts bigger for better readability.

v1.2 - 21.11.2023

• Removed pull-up resistor from SWCLK line.
• Added white silkscreen under LEDs to add light reflection.

v1.1 - 05.07.2023

• Moved few components around.
• Added BOOTSEL mini button for programming convenience.
• Changed LED resistors to allow more current, making LED to emit more light.

v1.0 - 25.06.2023

• Moved few resistors around.
• Added small GND fill under the MCU.
• Switched positions of UD- and GND pins on the side connector.
• Generated different set of BOM and CPL files for SOIC and WSON versions of the board.

v1.0b1 - 13.06.2023

Initial release for testing purposes.

Links

• Raspberry Pi RP2040 information page.
• Arduino Pro Mini information page.
• Arduino Nano RP2040 Connect page.
• Arduino SDK for RP2040 board.

How to Help

Your contributions as code, resources, or finances are welcome! Please contact me directly via email at andriy.golovnya@gmail.com or through my GitHub profile.

If you'd like to make a financial contribution, you can donate via PayPal or Ko-Fi. Your support is greatly appreciated.

Thanks in advance!