This is an Arduino library for the MPL115A2 pressure sensors, modified to be used with I2C library by Wayne Truchsess http://dsscircuits.com/articles/arduino-i2c-master-library.html

It is modified to be used with wlan slovenija sensor gateway: http://dev.wlan-si.net/wiki/Telemetry/sensgw

Originally, the it uses Wire Arduino library: https://github.com/misenso/MPL115A2-Arduino-Library
Pick one up at http://www.misenso.com/products/012/

Download the library by clicking Downlloads in top right, unzip, rename to MPL115A@ and paste in your arduino/libraries folder.Restart the IDE.