mbeals 74 Posted April 29, 2013 Share Posted April 29, 2013 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. pcb.brd Quote Link to post Share on other sites
Fred 453 Posted April 29, 2013 Share Posted April 29, 2013 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. Quote Link to post Share on other sites
mbeals 74 Posted April 29, 2013 Author Share Posted April 29, 2013 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. Quote Link to post Share on other sites
bluehash 1,581 Posted April 29, 2013 Share Posted April 29, 2013 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 mbeals 1 Quote Link to post Share on other sites
mbeals 74 Posted April 29, 2013 Author Share Posted April 29, 2013 awesome thanks! Quote Link to post Share on other sites
cubeberg 540 Posted April 29, 2013 Share Posted April 29, 2013 There's some good information here - including the files that B# just posted - http://www.ti.com/tool/430boost-sense1#technicaldocuments bluehash and mbeals 2 Quote Link to post Share on other sites
Fred 453 Posted April 29, 2013 Share Posted April 29, 2013 If you need a close up photo of the booster board then let me know. mbeals 1 Quote Link to post Share on other sites
mbeals 74 Posted April 30, 2013 Author Share Posted April 30, 2013 Thanks for the offer but the eagle files @@bluehash posted gave me all I needed. Quote Link to post Share on other sites
GG430 53 Posted April 30, 2013 Share Posted April 30, 2013 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: http://www.semtech.com/apps/filedown/down.php?file=capacitive-touch-sensing-layout-guidelines-an.pdf Specifically the wheel is working much better than the Touch BP because it's a well shaped layout. Not as fancy though ;-) bluehash 1 Quote Link to post Share on other sites
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