[System Diagram] A Non-invasive Liquid Measuring Device for the Blind



The initial design (above) made use of an RFID reader to identify the cup and its size. However after
talking to some people more knowledgeabel then my self I found out that you need a special RFID
printer and that integrating RFID reading circuitry is much more than a non-trivial task.


The revised design (below)makes use of electrodes and copper pads on the bottoms of the cups to indicate
the cup size. The limitation here is that the number of differnt size cups that can be handled is
a function of the number of electrodes.