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DIY Capacitive Proximity Sensors for Interactive Prototyping With Everyday Objects
This Instructable explores interactive potential of electrical field sensing by the means of Capacitive technology. It is because of the technologies low-cost and versatility that it is relatively easy to apply the technology into everyday objects, an area that can be explored by using off-the-shelf materials. https://www.instructables.com/id/DIY-Capacitive-Proximity-Sensors/
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DIY Touch Sensor or Capacitive sensor Switch with Arduino
Build your own touch sensor with this tutorial. https://www.youtube.com/watch?v=wOfTDxI1QUA
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Capacitors and capacitance
This video and lesson from Khan Academy offers a basic overview of capacitors and capacitance. https://www.khanacademy.org/science/physics/circuits-topic/circuits-with-capacitors/v/capacitors-and-capacitance