BMP180 Digital Barometric Pressure Sensor Module

Measures atmospheric pressure precisely enough to resolve altitude changes of around a metre, plus temperature, reporting both over I2C. Used in weather stations, altimeters and drone altitude hold. Because real weather shifts ambient pressure, absolute altitude drifts over hours unless referenced to a known sea-level pressure — but relative changes over minutes are dependable, which is exactly what altitude hold needs. Resolves altitude changes of roughly one metre; Temperature measurement included; I2C interface uses only two pins; Factory calibrated, no user calibration required