Adafruit
Adafruit BMP390 - Precision Barometric Pressure and Altimeter
The BMP390 from Bosch (also known as BMP390L) is a high-precision barometric pressure and temperature sensor, offering the best altitude accuracy in the Bosc...
The BMP390 from Bosch (also known as BMP390L) is a high-precision barometric pressure and temperature sensor, offering the best altitude accuracy in the Bosch pressure sensor lineup. With relative accuracy of ±3 Pascals (±0.25 metres of altitude) and noise as low as 0.1 metres, it is ideal for drone altitude hold, precision altimeters, and environmental monitoring.
Supporting both I2C and SPI interfaces, the BMP390 provides flexible connectivity. Use I2C for simple wiring with STEMMA QT / Qwiic plug-and-play connectors, or SPI to connect multiple sensors without address collisions. The breakout board includes a 3.3V regulator and level shifting for use with both 3V and 5V microcontrollers.
Key Features
- Barometric Pressure – ±3 Pascal relative accuracy
- Altitude Precision – ±0.25 metre accuracy with 0.1 m noise floor
- Temperature – ±0.5°C accuracy
- Dual Interface – I2C and SPI communication
- STEMMA QT / Qwiic – Plug-and-play I2C connectors on both sides for daisy-chaining
- Voltage Range – 3–5V operation via onboard regulator and level shifting
Also Available
- Adafruit BMP585 – Ported version with tube attachment for differential measurements
- Adafruit BMP388 – Previous generation (±0.5 m altitude accuracy)
- Adafruit BMP280 – Budget option (±1 m altitude accuracy)
- Adafruit BME280 – Adds humidity sensing to pressure and temperature
Ideal For
- Drone and quadcopter altitude hold
- Wearable altimeters and fitness devices
- High-precision weather stations
- Height-above-sea-level tracking applications
Package Contents
- 1× Adafruit BMP390 precision barometric pressure sensor breakout
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 is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- 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.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- 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.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
- STEMMA QT
- A small plug-in connector system for I2C boards that lets you connect compatible sensors and controllers without soldering. It matters because it can make wiring faster and less error-prone, especially when adding several small modules to a project.
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