Baroness
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This programm is made for simplifying the billig for beverages at an open fridge. Registered users can identify via a RFID tag and add their consumed beverages to their bill. The administrator of the system, called "Beer-Baron" can send the current bill of users via email and of course add some payments that are taken. This can be done via a web interface

Hardware
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The hardware used for this system consists of an raspberry pi, an RFID reader and a small touch screen connected via SPI.