(capacitive) Touch slider/potentiometer

Hi,

I'm searching for touch sliders that I can use with my arduino. Unfortunately I can't find a single one to buy or built. There are membrane potentiometer like This, but they are to inaccurately for my use case. I need to differentiate 128 values in 40-60mm width.

Here are a few examples for what I'm searching:


I only found a development board for a capacitive touch microcontroller, which has a touch slider. http://de.mouser.com/ProductDetail/Silicon-Labs/F990SLIDEREK/?qs=cvlTIYUSnFZ7OVkvy6CY1g==

Are there really no touch sliders?

if wired right, this provides 1023 values in a 100mm package.
they also have a 50mm version.

google "arduino soft pot" for tutorials.

This part is easy to use... just dont mix up the wiring... or it will fry (experience)

EDIT: LMGTFY - Let Me Google That For You

EDIT2: tutorials: LMGTFY - Let Me Google That For You

This one is 300mm. Maybe it would work.
http://store.curiousinventor.com/300mm-softpot.html