I have a graphic lcd with resistive touch screen. I have the screen=20
working fine for display but now need to get the touch portion working.=20
The problem I have is there are 4 wires for the touch surface and none=20
of them are labeled. I don't know which one is upper left, x axis or y=20
axis . I was hoping someone knew an easy way to figure this out.

What I have done is measure the resistance of the wires with no touch on=20
the screen and with one touch to the right bottom corner. Here are the=20
readings.

No touch:
Wires
1 -4  =3D .6k
1-2  =3D 2M
2-3 =3D  .4K
3-4 =3D 3.9M

With touch:
Wires
1-4 =3D .6k
1-2 =3D .8K
2-3 =3D .4k
3-4 =3D 1.4K

If some other measurements would be better just let me know and I will=20
do them. This is my first touch screen project so all pointers welcome .
Thanks
Mark


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