searching for sensitive load cell

[foTONICS]

In my final year of schooling I have chosen to design and build an electronic beer pong table.

Nothing fancy, just a circle of LED's that shine one color when the glass is full, a different when it is empty, and off when nothing is there.

I've started to research into what kind of sensor I should use and have thought about load cells, but I'm having trouble finding one that is sensitive and small enough to measure the roughly 3 grams of an empty dixie cup.

any leads?

 

[(*steve*)]

Isn't there a thread for this already?

Can you modify the cup? Placing a thin inductor and capacitor under the cup would create a tuned circuit you can detect. Any liquid in the cup will change the resonant frequency.

I am reminded of grid dip oscillators.