FWIW, here's photos of my "test bed" for the touch sensors. On the front you can see it's just a plastic box. The black dots are at the centers of the touch pads. I'll come up with some nice stick on labels for the buttons later.
On the back you can see the six touch sensors... just little squares of sticky backed copper tape with a wire on each one. Just temporary to learn how it all works. The glue isn't all that good so I'll need something more permanent later.
Around the pads, you see the "ground ring" that surrounds it all. it's connected to system ground (Vss) and helps limit the range of the sensor so it doesn't overlap others nearby, and also seems to make individual pads more sensitive.
Dunno if that helps in your quest for a cheap touch sensor, but my tests so far with the 16F727 are good. A finger touch on any of the six sensor pads activates my routines real nice.
I like 'em a lot so far!
steve
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