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As such, the CapSense MBR3 products are not designed to detect water droplets. In fact, it has available features to ignore water droplets and ensure the buttons still work in the presence of moisture…
Just updated my review http://www.element14.com/community/roadTestReviews/1819 after reading the datasheet and register techical manual one more time.
An idea I just saw on the adafruit website is using conductive tape to make up your capacitive sensors. Perhaps an alternative to the evaluation kit would be a breakout board and a selection of different conductive tape shapes.
The demos worked out fine. It's really simple to use. I do not have the code to interface with RPi but I found some code on the element14 blog and created a repository on GITHUB. Will be working to connect it with an arduino. I am also in the process of designing a PCB based on an Arduino and the Capsense. Anyone know where I can get sample devices for a prototype?