Thread: capacitive touchscreen with controller

Is it possible for someone to give me the exact dimensions (length/width) of the panel?

I was thinking since I have the mechatroniks machined aluminum double din kit, I probably could not modify the bezel easily to fit the screen but I could possibly place the new panel in front of the bezel since the bezel doesn't sit flush with the dash. Although there would be a slight gap between the panel and the viewable portion of the screen.

Or I could just splurge for the $160 kit made for the liliput on ebay and be done with it

Originally Posted by thunderbay

How about letting us know how the install went in the double din setup, as that's how my setup will be. did you cut the top and bottom off the DDIN kit? and how did you fill the ir sensor hole, or did you? how was the width relative to the kit? pictures would be nice.

boy do i feel like a cheater, i bought the kit off ebay, heres the LINK

its still on the workbench, i'm building some sort of vented cover for the back. sorry for the lack if input at this time, i'll try to get some pics up before i install it. it just seems like i should get the usb to run thru the monitor cable first.

Originally Posted by Maddnezz

You might be referring to me, I had mentioned that I was thinking about going this route, but ultimately it seemed like too much effort/risk. I might still go this route eventually (I'm quickly learning this project requires extended dedication) but for not there are more important hurdles to jump over. If you are still really interested in it, send me a PM I'll explain in detail the route I was planning on going. It should be a fairly simple task but it's always good to collaborate you might catch something I didn't and we help each other minimize the risk.

Actually, he was referring to me. See post # 69 in this tread.

I received the 3M touchscreen and controller and proceeded to install it last night. I got everything hooked up and working, but when installed in the car, my speakers were buzzing when the controller was plugged in. The pitch of the buzz would change as I touched the screen, as well.

Any idea what is causing that? My system has previously been buzz free, as I am very aware of any EMI or ground loop noises that are present and have gone to exhaustive lengths to prevent them.

Could this be a grounding problem with the touchscreen controller?

Thanks

Originally Posted by sivart321

I received the 3M touchscreen and controller and proceeded to install it last night. I got everything hooked up and working, but when installed in the car, my speakers were buzzing when the controller was plugged in. The pitch of the buzz would change as I touched the screen, as well.

Any idea what is causing that? My system has previously been buzz free, as I am very aware of any EMI or ground loop noises that are present and have gone to exhaustive lengths to prevent them.

Could this be a grounding problem with the touchscreen controller?

Thanks

I'm surprised that more people doing this upgrade haven't experienced this more often, since the technology for capacitive touch panels rely solely on measuring distortions in an electrostatic field emitted on the panel.

You could try, like you mentioned, grounding the controller. But other things you may want to try are:
-move any signal lines away from the screen, controller, or cable
-if intersecting cables cannot be avoided, have them intersect at 90 degree angles.
-ferrite chokes at each end of the usb cable for the controller

If you are using onboard audio, just hope that it is not picking up the buzz directly through the computer.

I used this to fix a bad eb701 touchscreen. I went to a car wash and i think they sprayed my screen with windex. Anyhow I put this in and its working. I used a stylus before and this is only working with finger touch.

Originally Posted by sivart321

I received the 3M touchscreen and controller and proceeded to install it last night. I got everything hooked up and working, but when installed in the car, my speakers were buzzing when the controller was plugged in. The pitch of the buzz would change as I touched the screen, as well.

Any idea what is causing that? My system has previously been buzz free, as I am very aware of any EMI or ground loop noises that are present and have gone to exhaustive lengths to prevent them.

Could this be a grounding problem with the touchscreen controller?

Thanks

I would guess that it is. If you read the install datasheet it states that the controller needs to be grounded and if I remember correctly it recommends grounding to the screen. I mounted mine to the side of the double DIN LCD kit and just ran a ground wire from the screw hole on the board to a ground point that was relatively close, I just do that out of habit with cards like this as the screw holes tend to be common ground.

Originally Posted by hokshi

I used this to fix a bad eb701 touchscreen. I went to a car wash and i think they sprayed my screen with windex. Anyhow I put this in and its working. I used a stylus before and this is only working with finger touch.

A normal stylus won't work, you went from a resistive touch screen to a capacitive. The way I understand a capacitive works, someone correct me if I'm wrong. It needs a conductive material (skin) to sense where it's being touch, and a resistive measures the amount of resistance at multiple points in the circuit, the more conductive wires in the circuit (4 wire seems like it's most common and seems like minimum) the more accurate. Those explanations are in a nutshell as it would take a wikipedia page to explain it all. There are stylus that are made specifically for capacitive touch screens, and I'm sure one of the many that you can get from ebay for the Iphone would work, if a stylus is that important to you. Come to think of it myself it might not be a bad idea as the edges can be a bit.....touchy (I hate myself a little more every time I make a joke that lame).