2.7 KiB
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: