There are a lot of different configuration.
Thise project is open source in Arduino and Processing too.
This configuration is designed to follow my personal needs, working in a software house:
- 3 buttons with custom messages , useful to know the reason for my absence ( services, meeting, break... )
- button submit message via interface with autoscroll function integrated, useful to create a list of tasks to accomplish, or just to send personal messages to the device.
- time button, useful to have a desk clock.
- thermometer button, useful for monitoring the temperature of the environment.
Dependig from you necessity you can add all the buttons that you need.
Here you are the video of my configuration, sorry but I'm Italian ;)