I'm surprised that there are pull-down resistors on the input pins. This tutorial doesn't have that: http://make.larsi.org/electronics/TouchScreen/ I would expect the pull-down resistors would make everything non-linear and may be what is keeping your pressure equations from working.
This document talks about getting pressure readings:http://www.ti.com/lit/an/sbaa155a/sbaa155a.pdf
And I still do not figure out how to measure the resistance across the x plane (not the x position). This data is supposed to be provided by in the panel datasheet but I have only a range, not a specific figure. How should I do it ?
Please enter a valid email to subscribe
We need to confirm your email address.
To complete the subscription, please click the link in the
email we just sent you.
Thank you for subscribing!
via Egeo 16