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 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