Push button with Nordic nRF52840 DK

Wiring for the Push button 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

Push button pin	Role	Nordic nRF52840 DK pin	Notes
1	Output from the part	P1.03	To a GPIO; use INPUT_PULLUP in code
2	Ground	GND

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 Push button?

1 → P1.03, 2 → GND.

Does the Push button work with the Nordic nRF52840 DK at 3.3 V?

Yes: the Push button 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 · Push button: all pins and data

The Push button on other boards

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