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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