BMP280 with Raspberry Pi Pico 2

Wiring for the GY-BMP280 pressure + temperature on the Raspberry Pi Pico 2 (RP2350, 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	Raspberry Pi Pico 2 pin	Notes
VCC	Power	3V3(OUT)
GND	Ground	GND
SCL	I2C clock (SCL)	GP5
SDA	I2C data (SDA)	GP4
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: 3.3 V from the 3V3(OUT) pin.
I2C uses the board’s default pins GP4 (SDA) and GP5 (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 = GP4, SCL = GP5 (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: rp2040:rp2040:rpipico2. If the board is not found, hold the BOOTSEL button while plugging in the USB cable.

Questions

Which Raspberry Pi Pico 2 pins do I use for the BMP280?

VCC → 3V3(OUT), GND → GND, SCL → GP5, SDA → GP4.

Does the BMP280 work with the Raspberry Pi Pico 2 at 3.3 V?

Yes: the BMP280 runs at 3.3 V and the Raspberry Pi Pico 2 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 Raspberry Pi Pico 2 pinout · GY-BMP280 pressure + temperature: all pins and data

The BMP280 on other boards

ESP32 DevKit Arduino Mega 2560 R3 Arduino Nano Arduino Uno R3 WeAct Black Pill STM32F411CE ESP32-C3-DevKitM-1 ESP32-S3-DevKitC-1 Nordic nRF52840 DK NUCLEO-F401RE Raspberry Pi Pico W Raspberry Pi Pico Teensy 4.1

Other parts on the Raspberry Pi Pico 2

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