Barometric Pressure Sensor
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The BMP085 from Bosch is the best low-cost sensing solution for measuring barometric pressure and temperature as well as altitude. Interfaces to the MCU via I2C interface and is designed to work with 3.3V and 5V systems, equipped with 3.3V regulator, I2C level shifter and the pull-up resistors for the I2C pins.The sensor is based on piezo-resistive technology for EMC robustness, high accuracy and linearity as well as long term stability.
Bmp180 Digital Barometric Pressure Sensor
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Measuring the absolute pressure of the environment using a digital barometer such as this has some interesting applications. By converting the pressure measured into altitude, you have a reliable sensor for determining the height of your robot, plane or projectile! Using a sensor as capable as the BMP180 you can achieve accuracy of 1m, with noise of only 17cm in ultra high resolution noise. The device will operate at only 0.3uA meaning low current draw for battery powered applications.
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