Basic questions about resistive touch screens

Other Hardware Displays
1

Hello,

I am thinking about using a resistive touchscreen as a XY+pressure sensor.

However there are a few things which I'd like to know:

  1. How useful is the pressure sensing ? I mean does it have a useful range ? How many levels of pressure can I expect after ADC conversion ? Is it reliable ?
  2. What is the usual tracking rate ?
  3. Is it possible and easy to buy just any commercial touch screen, hack it and connect it to an Arduino ?

Thank you in advance.

2

Hi,

I'm not sure I can help a lot, but I have a 2.4" touch screen on my MEGA, so if you think you can make some code to detect pressure, I may test it.
My library is ITDB02_touch from Henning Karlsen. See Electronics - Henning Karlsen

It allows you to set the precision of the screen, but I'm not sure the ITDB02 allows any pressure measurement.

For tracking rate, i'd evaluate it about 5-10 points/sec.

Possible, everything is. Easy, probably not. It will surely vary according to what you buy.

3

Hello touchinet, I did not see your message in time! If your proposal is still valid, could you please check if more data are available with the read() function than with the getX() and getY() functions?

Thank you in advance.

4

I am thinking about using a resistive touchscreen as a XY+pressure sensor.

You can't.
There is no pressure information to read from these, it dosn't work like that.