Re: gEDA-user: Suggestions for using a capacitive sensor IC

[DJ Delorie <dj@xxxxxxxxxxx>]

For plain circles, smt pads are easier and better.

If you wanted to do a resistive touch sensor with a circle with a ring
around it, you'd do the circle as a pad and a smaller circle (radius
== ring width) beside it.  Then, when you lay out the board, add an
arc centered on the big pad, intersecting the small pad.  Adjust the
angles with a text editor to come close to but not touch any traces
leading away from the center pad (or connect the center pad with a
via, and make the arc full circle.  Make the solder mask for the
center pad big enough to expose the ring too.


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