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.

The BMP180 comes fully calibrated and ready to use. As the device operates over I2C, we've added optional I2C pull-ups that can be enabled using the PU (pull-up) jumper on the board for your convenience and ease during breadboarding.

Using I2C, the device provides pressure and temperature as 16-bit values, which are used, along with calibration data within the device, to provide a temperature-compensated altitude calculation.