BMP280 Barometric Pressure and Altitude Sensor Module (I2C/SPI)

The BMP280 reads atmospheric pressure digitally and precisely enough that firmware can derive a surprisingly usable altitude estimate from it, since pressure drops in a predictable way with height above sea level. Compared to the older BMP180 sensor, it draws less current, responds faster, and supports both I2C and SPI wiring, which makes it the better fit for battery-powered weather stations, altitude-hold logic on small multirotor projects, and barometric-triggered data logging that wants to catch rapid pressure changes. Pairing its altitude estimate with a GPS module's own altitude reading is a common way to get a more responsive, lower-latency height signal than GPS alone can provide in fast-moving or signal-shadowed situations.