Pressure sensor enables altitude accuracy to within 8cm
Since temperature fluctuations, for example due to a change in the ambient temperature, can occur in cell phones, the temperature coefficient of the sensor is crucial to the accuracy of the altitude measurement that is achievable in practice. The temperature coefficient of the BMP180 is 0.01 hPa/°C, the lowest on the market claims the manufacturer. Noise is the other parameter that has a considerable effect on actual accuracy when determining altitude. Bosch has succeeded in reducing the noise of the sensor to a mere 0.02 hPa. This enables the BMP180 to detect altitude changes down to 0.17 m.
The BMP180 measures absolute pressure or altitude relative to a reference plane such as sea level accurate to within ±1 hPa. So the unit is also suitable for applications that require a classic altimeter. An established altitude profile can thus be recorded, for example during sports activities. As with indoor navigation, the pressure sensor can also assist the GPS during outdoor navigation by stepping in whenever the satellite navigation system in valleys or street canyons reaches its limits. The BMP180 is around 60 percent smaller than its predecessor BMP085 and comes in a 3.6×3.8×0.93mm package.
Visit Bosch Sensortec at www.bosch-sensortec.com
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