Measure the relative altitude using an atmospheric pressure sensor.
Click "START MEASUREMENT" at the reference height and start measurement.
Get the relative altitude value with "GET VALUES".
Initialize data with "RESET".
* This software includes works distributed under the Apache 2.0 license.
http://www.apache.org/licenses/LICENSE-2.0
MPAndroidChart - https://github.com/PhilJay/MPAndroidChart