DS18B20 with Nordic nRF52840 DK

Wiring for the DS18B20 waterproof temperature probe 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

DS18B20 pin	Role	Nordic nRF52840 DK pin	Notes
VDD	Power	5V	Red wire
DQ	One-wire data	P1.03	Yellow (sometimes white) wire. Needs a 4.7 kΩ pull-up to 3.3 V
GND	Ground	GND	Black wire

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 DS18B20?

VDD → 5V, DQ → P1.03, GND → GND.

Does the DS18B20 work with the Nordic nRF52840 DK at 3.3 V?

Yes: the DS18B20 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 BoardPilot

Full Nordic nRF52840 DK pinout · DS18B20 waterproof temperature probe: all pins and data

The DS18B20 on other boards

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