Is it possible to detect touch event and its position coordinates between two copper plates spaced apart by approximately 6-7 centimeters? The space between plates have to be transparent.

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    \$\begingroup\$ You want to detect the coordinates of something touching the inside of one of the plates just by detecting a change in capacitance? I don't think that's possible. There are ways to detect touch coordinates but just detecting capacitance change between two copper plates isn't one of them. \$\endgroup\$ – John D Aug 5 '15 at 20:34
  • \$\begingroup\$ I have a box which two opposite sides are copper plates. Now I need detect touch and slide on side between these plates. Is there any other solution (cheap and easy)? \$\endgroup\$ – VIPPER Aug 5 '15 at 20:42
  • \$\begingroup\$ Oh, I see. I don't know of any cheap and easy way to do that. \$\endgroup\$ – John D Aug 5 '15 at 20:52

There is really no way to do what you ask. Each copper plate is a single electrode. You therefore have a single capacitor. Something disturbing the field or coupling to the plates can be detected as a change in capacitance of the capacitor, but there is no way to tell where on a plate. You can only measure a single value. How do you suppose you get the additional degrees of freedom to determine location?

You can make a capacitively senses touchpad, but that is done with a array of individual capacitive sensors. There are a lot of different ways to go about measuring the capacitance, inducing the system with test signals, layout of the array, etc, etc. However, all these methods require multiple sensor capacitors to measure more than just touch or not-touch.

  • \$\begingroup\$ A way to obtain the touch coordinates would be to use an ultrasonic sensor. \$\endgroup\$ – BenG Aug 6 '15 at 19:36

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