Theremin Sensor
The sensors are small and sensitive digital Theremins useful for numerous applications including motion tracking, gestural interfacing, monitoring of small variations of electrical capacitances related to any sorts of conductive materials and media, including metal objects, foil, liquids, water, human body, plants, metal threads, thin plastic films with metallization, all sorts of Christmas stuff etc.
Analog and digital USB sensors for testing, experimenting and performance as well as all appropriate software libraries were provided by Andrey.
More info here: asmir.theremin.ru/theremin-sensors.htm