BMP280 I2C or SPI Barometric Pressure & Altitude Sensor

Bosch BMP280 barometric pressure and temperature sensor breakout with selectable I2C or SPI interface. Suitable for weather sensing and altitude estimation; successor to BMP085/BMP180.

Logical pinout · physical placement not verified

One grouped source record is expanded into separate logical pads where unambiguous; physical placement is not implied.

Vin
Input to the onboard regulator; Adafruit says power the breakout with 3-5VDC at the microcontroller logic level.
Type · PowerVoltage · 3-5VDC input
3Vo
3.3V output from the onboard regulator; Adafruit says up to 100mA can be drawn.
Type · PowerVoltage · 3.3V output, up to 100mA
GND
Common ground for power and logic.
Type · GroundVoltage · 0V
SCKSCL
SPI clock input; also I2C clock line SCL according to the Adafruit pinout page.
Type · I2C, SPIVoltage · 3-5V logic safe, use logic level on Vin
SDO
SPI serial data out from the BMP280 to the processor.
Type · SignalVoltage · 3-5V logic safe, use logic level on Vin
SDISDA
SPI serial data input to the BMP280; also I2C data line SDA according to the Adafruit pinout page.
Type · I2C, SignalVoltage · 3-5V logic safe, use logic level on Vin
CS
SPI chip select input; pull low to start an SPI transaction. Leave disconnected for I2C use per Adafruit guidance.
Type · SPIVoltage · 3-5V logic safe, use logic level on Vin

Pin	Type	Function	Voltage
Vin	Power	Input to the onboard regulator; Adafruit says power the breakout with 3-5VDC at the microcontroller logic level.	3-5VDC input
3Vo	Power	3.3V output from the onboard regulator; Adafruit says up to 100mA can be drawn.	3.3V output, up to 100mA
GND	Ground	Common ground for power and logic.	0V
SCKSCL	I2C, SPI	SPI clock input; also I2C clock line SCL according to the Adafruit pinout page.	3-5V logic safe, use logic level on Vin
SDO	Signal	SPI serial data out from the BMP280 to the processor.	3-5V logic safe, use logic level on Vin
SDISDA	I2C, Signal	SPI serial data input to the BMP280; also I2C data line SDA according to the Adafruit pinout page.	3-5V logic safe, use logic level on Vin
CS	SPI	SPI chip select input; pull low to start an SPI transaction. Leave disconnected for I2C use per Adafruit guidance.	3-5V logic safe, use logic level on Vin

Logical pinout · physical placement not verified

One grouped source record is expanded into separate logical pads where unambiguous; physical placement is not implied.

Pin details

7 connections

Vin
Input to the onboard regulator; Adafruit says power the breakout with 3-5VDC at the microcontroller logic level.
PowerVoltage · 3-5VDC input
3Vo
3.3V output from the onboard regulator; Adafruit says up to 100mA can be drawn.
PowerVoltage · 3.3V output, up to 100mA
GND
Common ground for power and logic.
GroundVoltage · 0V
SCKSCL
SPI clock input; also I2C clock line SCL according to the Adafruit pinout page.
I2C, SPIVoltage · 3-5V logic safe, use logic level on Vin
SDO
SPI serial data out from the BMP280 to the processor.
SignalVoltage · 3-5V logic safe, use logic level on Vin
SDISDA
SPI serial data input to the BMP280; also I2C data line SDA according to the Adafruit pinout page.
I2C, SignalVoltage · 3-5V logic safe, use logic level on Vin
CS
SPI chip select input; pull low to start an SPI transaction. Leave disconnected for I2C use per Adafruit guidance.
SPIVoltage · 3-5V logic safe, use logic level on Vin

Start wiring

I2C · SPI · Single data line · 3.3 – 5 V · Breakout

Confirm the data interface matches your host board.

Module pins: Vin, 3Vo, GND, SCK / SCL, SDO, SDI / SDA, CS. Schematik maps them to your board in the app.

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Pinout