What is capacitive sensing
This is how the Touch Board works, but what does it really mean?
Capacitive sensing is a proximity sensing technology. It detects nearby objects by sensing that the electric field generated by a sensor (in this case one of the 12 electrodes), has been disrupted. It can detect anything that is conductive or that has a significantly different permittivity* than that of air, like a human body or hand.
Capacitive sensing is the technology used in smartphone screens to detect touch. It’s also used in other situations where there’s a need to detect human touch or proximity. It’s also used when trying to detect something without touching it.
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The Touch Board has 12 capacitive sensing electrodes, each of which can individually detect touch and proximity.
*Permittivity [put-mi-tiv-i-tee] is the measure of the difficulty encountered when forming an electric field in a material. The ability of a substance to store electrical energy in an electric field.
Touch screens on your smartphone or tablet, or the trackpad on your laptop also work with capacitive sensing.