An Arduino micro measures the weight on the load cell, and with the known densities of gin, vermouth, and Kahlua, [Tony] can get a very good idea of how much liquid is in the cocktail shaker.

An Arduino Uno has been used in the projects for controlled using pins 2 and 3 as interrupts to ensure correct rotation and thus linear travel sensing. Correct movement is facilitated with a pair ...

[Chris] tipped us off about a different take on the linear book scanner created by ... and employs two handheld scanners driven by an Arduino Mega. We don’t have a great deal of information ...