Touchscreen Calibration Issue

**Bugbyte** · 11-04-2004, 01:03 AM

Hi - newbie here. I've purchased an 8" touchscreen and USB controller and am having problems calibrating it. I've emailed them but haven't gotten a response so after doing a

I thought I'd ask.

Starting in the upper right hand corner of the screen, if I touch there, the pointer displays more or less directly under my fingertip but as I move diagonally (both down and toward the middle of the screen) the pointer moves progressively (seemingly exponentially) farther to the left and down. By the time I reach the exact middle of the screen, the pointer is all the way in the lower left hand corner and activates the Start menu.

The controller didn't come with any instructions so I plugged the cable in the way I thought it should go. Is it possible I plugged it in upside down? The reason I haven't tried turning it over is because I'm not sure if that would damage the controller or not.

Any advice is appreciated.

**cxl214** · 11-05-2004, 03:47 AM

I think you can give it a try. I have a PS/2 5-Wire type touch screen, and have similar problem like yours. After I reverse the connection, it worked out just fine. You can also check their web site. They should have the pin assignment post on the web.

**digitalww** · 11-07-2004, 05:23 PM

You need to do a 4 point calibration and then the 25 point. This will fix all your problems.

Armen

Originally Posted by Bugbyte

Hi - newbie here. I've purchased an 8" touchscreen and USB controller from digitalww and am having problems calibrating it. I've emailed them but haven't gotten a response so after doing a

I thought I'd ask.

Starting in the upper right hand corner of the screen, if I touch there, the pointer displays more or less directly under my fingertip but as I move diagonally (both down and toward the middle of the screen) the pointer moves progressively (seemingly exponentially) farther to the left and down. By the time I reach the exact middle of the screen, the pointer is all the way in the lower left hand corner and activates the Start menu.

The controller didn't come with any instructions so I plugged the cable in the way I thought it should go. Is it possible I plugged it in upside down? The reason I haven't tried turning it over is because I'm not sure if that would damage the controller or not.

Any advice is appreciated.

**Bugbyte** · 11-20-2004, 01:38 AM

Eh...the problem is that when I do the 4 point calibration, I can't touch any of the points on the screen. For example, the first point is in the lower left of the screen. In order for the cursor to be anywhere near that point, I'm actually touching near dead center of the touchscreen. Regardless, I'm unable to ever have the calibration routine recognize that I touch that point so I can never complete the calibration. Vicious circle.

BTW, I flipped the connector without frying the board but got no better results.

I mounted the screen using duct tape around the very edges. I was careful not to go but 1/8" in. Still, is it possible that would cause the kind of problems I'm having?

**archimense** · 11-20-2004, 01:46 AM

Sounds like the touchscreen panel is bad.

Almost the same thing happened to my Lilliput.

**Don 944 LA** · 11-20-2004, 05:22 PM

Thats a common problem with the lilliputs.

There is a reset that clears any values on the TS.
try doing the reset first.
I have 2 that do the same thing.

**DJ WATTS** · 11-22-2004, 05:15 AM

4 point worked for me, 25 point however was too much and messed up me screen setting so a few goes with 4 point again and its now puuuuurfect!!

**WhiteRabbit** · 12-03-2004, 01:16 AM

have you tried doing the 4 point calibration with disregard where the cursor is during the test?

**Bugbyte** · 12-03-2004, 08:53 AM

Originally Posted by WhiteRabbit

have you tried doing the 4 point calibration with disregard where the cursor is during the test?

I have but no matter where I touch on the screen, it doesn't detect it as touching the point it is asking me to. The screen beeps each time I touch it, so it is detecting the touch, just never calibrates.