I think that was that automated greenhouse thingy.
This is basically a Raspberry Pi with sensors, a fan and a water pump controlling the air circulation and watering of the greenhouse. The data from the sensors gets stored in a database and you can check the temperature & humidity history on a shitty web interface.
This was one of my very first projects and I'm really proud of finishing it although it's really not perfect. When I started it I had never worked with
1) databases
2) sensors on the raspi
3) webinterfaces
before and somehow managed to get it working.