BMP280 with Nordic nRF52840 DK

Wiring for the GY-BMP280 pressure + temperature 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

BMP280 pin	Role	Nordic nRF52840 DK pin	Notes
VCC	Power	VDD
GND	Ground	GND
SCL	I2C clock (SCL)	P0.27
SDA	I2C data (SDA)	P0.26
CSB	Not wired to the board	not connected	Chip select. Leave unconnected (pulled HIGH on the board) to use I2C
SDO	Not wired to the board	not connected	Address select: LOW = 0x76, HIGH = 0x77. Most boards default to 0x76

Check before you power it on

Supply: 3 V from the VDD pin.
I2C uses the board’s default pins P0.26 (SDA) and P0.27 (SCL). Most modules include pull-up resistors; if the part is not found, check them and swap-test SDA/SCL.
To make sure it is the real chip, read register 0xD0: a genuine part answers 0x58.

Test code (Arduino)

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  Wire.begin();  // SDA = P0.26, SCL = P0.27 (the board's default I2C pins)
  Wire.beginTransmission(0x76);
  bool found = Wire.endTransmission() == 0;
  Serial.println(found ? "GY-BMP280 pressure + temperature found at 0x76" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

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 BMP280?

VCC → VDD, GND → GND, SCL → P0.27, SDA → P0.26.

Does the BMP280 work with the Nordic nRF52840 DK at 3.3 V?

Yes: the BMP280 runs at 3.3 V and the Nordic nRF52840 DK uses 3.3 V signals, so no level shifting is needed.

What is the I2C address of the BMP280?

0x76 or 0x77. An I2C scan (BoardPilot does it for you) shows which one your module uses.

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 · GY-BMP280 pressure + temperature: all pins and data

The BMP280 on other boards

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