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Replying to @tomfleet

Credit where credit’s due: this is using @Adafruit’s FreeTouch library (Ladyada’s awesome reverse engineering of the SAMD21 PTC), and these matrix designs were deeply inspired by @PatternAgents’ open source library of touch controls: http://www.patternagents.com/news/2013/11/24/eagle-touch-widgets-library.html

(original)