BoardPilotSD card module with Nordic nRF52840 DK
Wiring for the SD card module (full size, SPI) on the Nordic nRF52840 DK (nRF52840-QIAA, 3.3 V logic), chosen with the same pin rules BoardPilot uses: default buses first, and no pins that are used for flash, USB, the debugger or booting.
Wiring
| SD card module pin | Role | Nordic nRF52840 DK pin | Notes |
|---|---|---|---|
| GND | Ground | GND | |
| 3V3 | Power | 5V | Use 3V3 or 5V, not both |
| 5V | Not wired to the board | not connected | Alternative 5 V input through the on-board regulator |
| CS | SPI chip select | P1.12 | |
| MOSI | SPI MOSI | P1.13 | |
| SCK | SPI clock | P1.15 | |
| MISO | SPI MISO | P1.14 | |
| GND2 | Ground | GND |
Check before you power it on
- Supply: 5 V from the 5V pin.
Test code (Arduino)
The Arduino core for this board numbers its pins differently from the chip names, so no code is shown here. Use the pin names from your core’s variant file.
Arduino board: adafruit:nrf52:pca10056. Plug USB into the port on the short edge (interface MCU, J2) and set the power switch to ON; before the first Arduino sketch, burn the Adafruit bootloader and SoftDevice once.
Questions
Which Nordic nRF52840 DK pins do I use for the SD card module?
GND → GND, 3V3 → 5V, CS → P1.12, MOSI → P1.13, SCK → P1.15, MISO → P1.14, GND2 → GND.
Does the SD card module work with the Nordic nRF52840 DK at 3.3 V?
Yes: the SD card module runs at 3.3-5 V and the Nordic nRF52840 DK uses 3.3 V signals, so no level shifting is needed.
BoardPilot checks this wiring in 3D as you build it, and finds crossed or missing wires on the real board.
Download BoardPilotFull Nordic nRF52840 DK pinout · SD card module (full size, SPI): all pins and data
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