Adafruit BMP581 I2C/SPI Barometric Pressure & Temperature Sensor - STEMMA QT Breakout

The module is designed for a 3.3V to 5V DC input via the STEMMA QT connector or header pins. Its onboard 3.3V regulator powers the sensor, and integrated level shifters ensure safe communication with both 3.3V and 5V logic microcontrollers like Arduino Uno, Raspberry Pi, or ESP32.

Use a STEMMA QT (or compatible Qwiic) 4-pin JST PH cable to connect the sensor directly to another STEMMA QT/Qwiic enabled board. This provides power, ground, SDA, and SCL connections. The I2C address is configurable via a solder Jumper on the back of the breakout board.

Relative pressure accuracy (±0.4 Pa) refers to the sensor's precision in detecting small changes or differences in pressure, critical for altitude resolution. Absolute pressure accuracy (±30 Pa) is the accuracy of the sensor's reading against a known reference across its entire measurement range, important for absolute altitude or weather pressure readings.

No, the BMP581 sensor core supports both protocols, but you must select one communication interface at a time. The breakout board uses pin configuration and dedicated chip select (CS) for SPI. The interface is typically selected via hardware connections and corresponding library initialization in your code.