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This is a cool Arduino capacitance sensor which can be hooked up to the Arduino and used as a candy box. The video includes the ability to hook this up to processing for a counter. It only uses a couple of wires and resistors, some foil, and a candy basket.
for a cheaper project, it is possible to make a capacitance sensor with just a 5 indian rupee (8 cent/0.08$) 555 timer IC.
also we can measure capacitance with it
http://www.arduino.cc/playground/Main/CapSense

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