Bosch BMP280 Digital Pressure & Temperature Sensor, -40°C~+85°C, I²C & SPI, Compact LGA, Range: 300 hPa~1100 hPa

The BMP280 offers significant improvements over the BMP180, including lower power consumption, higher accuracy, support for both I²C and SPI interfaces, and a smaller physical footprint. It also features more advanced internal filtering and a wider operating voltage range (1.71V to 3.6V), making it better suited for modern, battery-sensitive mobile applications.

The interface is selected via hardware pin configuration. The BMP280's SDO pin acts as the SPI data output and also sets the I²C device address. Pulling SDO high or low selects one of two possible I²C addresses. For SPI mode, the CSB (chip select) pin must be controlled, and the device uses a standard 4-wire SPI protocol. Consult the datasheet for the precise pin connection diagram.

The BMP280 has a typical absolute accuracy of ±1 hPa. For best stability, ensure the sensor is not exposed to direct airflow or rapid temperature changes. Utilizing the sensor's internal oversampling and filtering settings (configurable via registers) can reduce noise and improve the effective resolution in dynamic environments. Proper power supply decoupling is also critical.

Yes, the BMP280 is excellent for measuring relative altitude changes due to its high 0.01 hPa resolution, which corresponds to roughly 10 cm of altitude difference. For absolute altitude, an accurate reference SEA-level pressure value is required. Its low noise and fast response make it suitable for drone altitude hold, climb rate detection, and wearable altitude tracking applications.