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An Arduino Uno capacitive touch sensor module detects touch through changes in capacitance. It provides a digital signal when touched, used for creating touch-sensitive interfaces and controls in ...

The sensor forms an image and OpenCV detects the actual touch configuration. It appears you can use the raw data from the Arduino, too, but it might be a little harder.

[mircemk] shows how to create a simple non-contact proximity sensor using little more than an Arduino Nano board, and a convenient software library intended to measure the value of capacitors. The … ...

Touch Board works with any conductive material, and although it comes pre-programmed, it can also be programmed like any other Arduino.