Hand on capacitive touch screen

by damienb, published

Hand on capacitive touch screen by damienb Mar 16, 2013
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This is the data returned when a hand is laid on a projected capacitive touchscreen (same technology as cellphones).


This is an example output of my Matlab function to convert any Z-map into a STL file.
The generated solid has a specified size(max) and thickness (min/max).
It's also possible to choose the degree of interpolation to smooth the output result.

Are included 3 levels of interpolation.

The explanation & script are available here: http://wp.me/p3gI7M-1S

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The Microchip sensor is also using mutual-capacitance (capacity measure between 2 electrodes). The Difference is in the number and shape of the electrodes. To detect the gestures at a few cm from the surface they are using 1 driver and 5 big receivers (see p11 http://ww1.microchip.com/downloads/en/DeviceDoc/41667A.pdf)http://ww1.microchip.com/downl.... This is great to "sense" gestures like shown in the video using only 5 measures. In the case of capacitive touch screens, the number of electrodes is vastly larger (the 15inches in this "thing" has 40*70~2800 intersections). So you get a very good resolution and you are able to detect multi-touch gestures.