SMAPS (SMArtphone Pressure System) is a framework for collecting and processing pressure data from smartphones for use in numerical weather prediction models.
Both an iOS and Android version is maintained. The logic for both versions is the same, but of course the code differs. (Currently only the iOS version is available)
The framework is included into apps to collect pressure information to make better weather forecasts.
For installation instructions see the ios and android directories respectively.
The framework itself is called smaps, but comes also with a simple app to show how to install and initialise the smaps framework.