LED with Nordic nRF52840 DK

Wiring for the LED with 220 Ω resistor 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

LED pin	Role	Nordic nRF52840 DK pin	Notes
A	Input to the part	P1.03	Anode (long leg), through the resistor to a GPIO
K	Ground	GND	Cathode (short leg, flat side)

Check before you power it on

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 LED?

A → P1.03, K → GND.

Does the LED work with the Nordic nRF52840 DK at 3.3 V?

Yes: the LED runs at 3.3 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 BoardPilot

Full Nordic nRF52840 DK pinout · LED with 220 Ω resistor: all pins and data

The LED on other boards

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