Adafruit
Adafruit BMP280 I2C or SPI Barometric Pressure Altitude Sensor
The BMP280 from Bosch is a precision barometric pressure and temperature sensor, and the next-generation upgrade to the BMP085/BMP180/BMP183 family. With sup...
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The BMP280 from Bosch is a precision barometric pressure and temperature sensor, and the next-generation upgrade to the BMP085/BMP180/BMP183 family. With support for both I2C and SPI communication, it offers flexibility for a wide range of weather sensing and altitude estimation projects.
With ±1 hPa barometric pressure accuracy and low altitude noise of 0.25 metres, the BMP280 delivers reliable environmental readings suitable for weather stations, altimeters, and IoT applications. The breakout board includes a 3.3V regulator and level shifting for easy use with both 3V and 5V microcontrollers.
Key Features
- Barometric Pressure – ±1 hPa absolute accuracy
- Temperature – ±1.0°C accuracy
- Altimeter – ±1 metre accuracy with 0.25 m noise floor
- Dual Interface – I2C and SPI communication
- Voltage Range – 3–5V operation via onboard regulator and level shifting
- Fast Conversion – Quick sampling for responsive applications
Also Available
- Adafruit BMP280 – Assembled – Same sensor with headers pre-soldered
- Adafruit BMP388 – Higher precision altimeter (±0.5 m accuracy)
- Adafruit BME280 – Adds humidity sensing to pressure and temperature
- Adafruit BME680 – Adds humidity and VOC gas sensing
Ideal For
- Weather stations and environmental monitoring
- Altitude estimation for drones and robotics
- IoT environmental sensing projects
- Multi-sensor setups using SPI to avoid I2C address conflicts
Package Contents
- 1× Adafruit BMP280 breakout board (headers not soldered)
Jargon buster
Plain-language definitions for the technical terms used above.
- 3.3V regulator
- A 3.3V regulator is a power circuit that provides a steady 3.3 volts for parts that need that supply voltage. On a breakout board, it can let the sensor run safely even when the connected microcontroller or power source uses a higher voltage.
- breakout
- A breakout board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny contacts.
- Headers
- Rows of connector contacts on a fixed pitch (commonly 2.54 mm) used to link a board to a breadboard, jumper wires, or another board. They come as male pin headers and female socket headers; when a module ships with pre-soldered headers it can be used straight away, whereas bare pads require soldering the pins yourself.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- I2C address
- An I2C address is the number a device uses so a microcontroller can tell it apart from other devices on the same I2C bus. It matters because two devices with the same fixed address may conflict if used together.
- IoT
- Short for Internet of Things, meaning physical devices that connect to networks or the internet to send data or be controlled remotely. It matters if you want projects such as connected sensors, remote controls or classroom data-logging activities.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
- VOC
- Volatile organic compounds are gases released from things like paints, cleaners, smoke, and some plastics. A VOC reading helps indicate indoor air quality, but it is usually an index or estimate rather than a direct identification of each chemical.
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