Adafruit BMP390 - Precision Barometric Pressure and Altimeter - STEMMA QT / Qwiic

The Adafruit BMP390 (or BMP390L) is a precision barometric pressure sensor and altimeter breakout from Bosch, following in the footsteps of its predecessors like the BMP085, BMP180, BMP280, and BMP388. As the next-generation sensor, the BMP390 offers improved precision, making it ideal for environmental sensing and tracking altitude with exceptional accuracy. You can use it in either I2C or SPI configurations, providing flexibility depending on your project needs.

With a relative accuracy of ±3 Pascals, the BMP390 provides about ±0.25 meters of altitude accuracy—a significant improvement over the BMP280’s ±1 meter and the BMP388’s ±0.5 meter. It also boasts a low-altitude noise as low as 0.1m and a fast conversion time, making it an excellent choice for applications like drones and quadcopters where stable altitude control is essential. It can also be used in wearables or any project that requires precise tracking of height above sea level. While it can measure temperature with ±0.5°C accuracy, you’ll still need to input the barometric pressure at sea level for absolute height measurements if the weather changes—this is true for all pressure-based altimeters.

The sensor is easy to integrate into your projects. It’s mounted on a custom PCB with STEMMA QT connectors, making it simple to connect to compatible I2C or SPI devices. The STEMMA QT format allows for solderless connections to development boards and makes chaining with other compatible sensors and accessories a breeze. While QT cables are not included, you can find a variety of them available in the shop.

To make integration even easier, the BMP390 comes with a 3.3V regulator and level shifting, allowing you to use it with both 3V and 5V logic microcontrollers. With the included Arduino library, you can start getting data from the sensor in under 10 minutes, ensuring you can quickly dive into your next project!