Our project is an automatic composting bin. The goal is to remove the human maintenance aspect that is so often neglected.
The composting bin will be able to mix the compost on its own. It will have temperature and humidity sensor to acquire data, as well as an ultrasonic sensor to tell you how full it is.
As an additional feature it suggest plants, depending on the season, you could spend your compost on.

https://dl.dropboxusercontent.com/u/87163060/AA%20schets.jpg

https://dl.dropboxusercontent.com/u/87163060/VA%20schets.jpg