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A capacitive sensor ("capsense") measures capacitance, but normally this is the means to measuring something else: for example moving your hand close to a metal plate increases its capacitance to ground. Measuring the capacitance thus measures the the touch (capacitive touch sensor) or near-touch. Two insulated electrodes on either side of a glass tube can detect the presence of water in the tube by the change capacitance. | A capacitive sensor ("capsense") measures capacitance, but normally this is the means to measuring something else: for example moving your hand close to a metal plate increases its capacitance to ground. Measuring the capacitance thus measures the the touch (capacitive touch sensor) or near-touch. Two insulated electrodes on either side of a glass tube can detect the presence of water in the tube by the change capacitance. | ||
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*[http://www.instructables.com/id/Building-a-Capacitive-Liquid-Sensor/ Building a Capacitive Liquid Sensor] | *[http://www.instructables.com/id/Building-a-Capacitive-Liquid-Sensor/ Building a Capacitive Liquid Sensor] | ||
* [http://emergent.unpy.net/01219970985 "Two-element capacitative touch sensor"] with an Arduino. Hints at how to extend to more elements. | * [http://emergent.unpy.net/01219970985 "Two-element capacitative touch sensor"] with an Arduino. Hints at how to extend to more elements. |