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Capacitive Touch PCB layout

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Does anyone have experience making a capacitive touch board?  I've read through an app note put out by ATMEL (http://www.atmel.com/Images/doc10752.pdf) and the TI app note on using TimerD + compB (http://www.ti.com/lit/an/slaa363a/slaa363a.pdf) and came up with the attached board.


I just don't know if the pad layout is correct, if the ground planes are okay and if I will have issues with the signal traces back to the MCU.




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I may be stating the obvious, but have you looked at the Capacitive Touch Booster pack to see how that was done and if it gives any clues?


What are you making? I'm at work so can't view the brd file at the moment.



I tried but I couldn't find a board layout or even really good pics of the booster pack.


The board is just an F5172 based dev board.


Attaching eagle design files.

Design Files.zip

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Depending on what you are looking for, IMHO the TI Touch BP layout for the wheel is not very good because of the interlaced wheel finger portions, it might look cool though ;-)

One of the best guides to sizes, pitchs and layout I found is this one:


Specifically the wheel is working much better than the Touch BP because it's a well shaped layout. Not as fancy though ;-)

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