On Wed, 31 Oct 2001, Walter Banks wrote:

> Check on Scott's and our web site for information on touch
> switch technology.
> w..

For Walter's:

http://www.bytecraft.com/touch.html

For mine? I don't have any thing about touch sensing on my personal Web
page. However, my employer Synaptics, the market leader for TouchPads, has
quite a bit: http://www.synaptics.com/ .

I'd really be surprised if the QProx devices are just PICs with the part
number scraped off. More likely they've licensed MicroChip's core along
with some proprietary circuitry and have contracted with Microchip to
produce it. This is just a WAG; but it's an educated WAG. Detecting a
single touch *is* straight forward. However, producing a design that is
robust to variations in numerous parameters is not easy. In our touchpads,
we go through numerous details to ensure robustness. This is obvious if
you've ever looked closely at one of our designs. Although, we can
actually not just detect touch, but, more importantly, where the touch
occurred. It's not a trivial problem.


As a related aside, does anybody have an application where they'd like to
use capacitive touch sensing to resolve position? I have my nose to the
engineering grindstone, but occasionally have my ear against the marketing
wall.

Scott

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