Buranyaaa! If you love ironically drinking pilk (50% pepsi, 50% milk mix), or like anime women, this badge is for you!
This is a fun project we did at hackerspace. @weaselcore did the art, @critbit made it into a PCB.
After inserting the bottles, the eyes glow up. Inserting bottles requires a bit of wiggling, since the holes are a bit skewed - after inserting, they more-or-less stay in place.
You will need:
0603
or 0805
(soldered upside-down)0603
resistors, value between 470 and 200 ohm (the brightest)
On 1st revision board, there's also an option for using a LiPo charger PCB instead of CR2032 holder, but this is not supported, nor advised. Do it on your own risk.