How to use a 4 wire resistive touchscreen with an Arduino

A resistive touchscreen consists of two flexible and resistive sheets with an air gap between them. Then the screen is touched, the two sheets are pressed together.
By applying a voltage over one of the sheets it is possible to calculate the position in one direction by measuring the voltage on the other sheet.
To get the position in the other direction the voltage is applied over the other sheet (the one you previously measured the position from) and measure the position from the first sheet (the one you previously apply a voltage over).

In this video it is shown how to do this with an Arduino.

Видео How to use a 4 wire resistive touchscreen with an Arduino канала Marcus Waerme