Barograph displays the air pressure in millibar or inHg of the last 24 hours in a graph. You can enable a storm alarm, show the history of the past week and correct the pressure to sea level with a fixed altitude or using the altitude from the GPS. Works only on android devices that have a barometric sensor, like the Motorola Xoom, Galaxy Nexus, Galaxy Note or the Sony Xperia Active (Please let me know if there are other devices that have a barometric sensor).
GPS support to determine altitude. Original pressure is also plotted when using altitude.
Another attempt to keep background service alive. Filtering of strange pressure values.
Fixed wrong pressure in graph caption. Added averaging level, high level gives smooth graph when zoomed in.
Moved slidebar to settings. Less battery usage.
Option to hide second graph when using altitude.