If you are like me, you need energy to work. And sometimes, at the end of a long workday, it is just too long since you had lunch. In my office, I am not alone in this, so we made a vending machine with some chocolate, nuts and other snacks to help us get through the day.
The machine runs off an EFM32 STK and uses RFID to authenticate users and keep track of balances. It has a simple LCD-and-buttons user interface and a telnet interface over WiFi for adding users, products etc.
I have put up the source code and a description of the system on bitbucket if anyone is interested in making something similar: