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README.md

SparkFun Pro nRF52840 Mini Breakout

The SparkFun Pro nRF52840 Mini small breakout board for Raytac's MDBT50Q-P1M module, which features an nRF52840. It breaks out as many pins as it can in an Arduino Pro Mini footprint. Also included on the board are a qwiic (I²C) connector, LiPo battery charger, and on/off switch.

Note: the SparkFun Pro nRF52840 Mini Breakout does not include a QSPI external flash. Any Python code will need to be stored on the internal flash filesystem.

CircuitPython Pin Defs

CircuitPython pin definitions try to follow those of the Arduino Pro Mini, which the footprint is based on.

This can be somewhat confusing, especially around the analog pins. Here's a quick pin-map:

Board pin label	Digital Pin Reference	Additional Pin Capabilities	Pin/Port Reference
17	D1	TX	P0_17
15	D0	RX	P0_15
8		SDA	P0_08
11		SCL	P0_11
19	D3		P0_19
20	D4		P0_20
21	D5		P0_21
22	D6		P0_22
23	D7		P0_23
9	D8		P0_09
10	D9		P0_10
2	D10	A0	P0_02
3	D11	MOSI, A1	P0_03
31	D12	MISO, A7	P0_31
30	D13	SCK, A6	P0_31
29		A5	P0_29
28		A4	P0_28
5		A3	P0_05
4		A2	P0_04

If a pin isn't defined as D0, D1, etc., standard port/pin references should work -- e.g. P0_17 is pin 17, P0_02 is pin 2, etc.

Bootloader Notes

The nRF52840 Mini ships with a slightly modified (i.e pin defs and USB defs) version of the Adafruit nRF52 bootloader, which supports UF2 and CDC bootloading.

Hardware Reference

The nRF52840 Mini hardware layout is open source: