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

[Helmut Zulus <helmut.zulus@xxxxxx>]

A practically prooved example of a capacitive sensor matrix keypad, with 
all design files and extensive description of the operation, you can 
find at http://diycalculator.pcl.at
Unfortunately, the project described there is not done in gEDA/gaf nor 
with the IC you want to use but it nicely covers all the sensor stuff.

Have fun!
Helmut


DJ Delorie schrieb:
> 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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