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A New Chapter for MagicMirror: The Community Takes the Lead
Read the statement by Michael Teeuw here.

IR Touch Frame calibration

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  • P Offline
    peemoeller @cyberphox
    last edited by Feb 20, 2019, 5:57 PM

    @cyberphox thanks! Are you able to point me on how to make the adjustments? I have xinput installed but not sure where to go from here.
    Thanks for your help!

    1 Reply Last reply Reply Quote 0
    • C Offline
      cyberphox
      last edited by Feb 21, 2019, 1:03 PM

      run the calibration from the menu…touch the points and that’s it!

      Full time Dad, DJ and entertainer and lover of technology.

      P 1 Reply Last reply Feb 21, 2019, 5:58 PM Reply Quote 0
      • P Offline
        peemoeller @cyberphox
        last edited by peemoeller Feb 22, 2019, 5:01 AM Feb 21, 2019, 5:58 PM

        @cyberphox Hi there, ok! I now managed to get my IR Touch Overlay set to portrait! also just finished running the xinput touch calibrator program under ‘Preferences’ (it had me touch the 4 red crosses). It shows:

        < Calibrating standard Xorg driver “Multi touch overlay device” current calibration values: min_x=0, max_x=65535 and min_y=0, max_y=65535
        If these values are estimating wrong, either supply it manually with the - -precalib option, or run the ‘get_precalib.sh’ script to automatically get it (through HAL). >

        My issue, I find the curser doesn’t reach the the edges of my monitor. Example I can’t simply click on the Raspberry Icon in the corner. The curser is diaginally 2 inches away? I have a 42 inch IR Touch Overlay using a 32 inch LCD monitor.

        Where can I set or adjust this? Any thoughts?

        Fun!

        K 1 Reply Last reply Feb 27, 2019, 10:26 AM Reply Quote 0
        • K Offline
          klimbo @peemoeller
          last edited by Feb 27, 2019, 10:26 AM

          @peemoeller said in IR Touch Frame calibration:

          @cyberphox Hi there, ok! I now managed to get my IR Touch Overlay set to portrait! also just finished running the xinput touch calibrator program under ‘Preferences’ (it had me touch the 4 red crosses). It shows:

          < Calibrating standard Xorg driver “Multi touch overlay device” current calibration values: min_x=0, max_x=65535 and min_y=0, max_y=65535
          If these values are estimating wrong, either supply it manually with the - -precalib option, or run the ‘get_precalib.sh’ script to automatically get it (through HAL). >

          My issue, I find the curser doesn’t reach the the edges of my monitor. Example I can’t simply click on the Raspberry Icon in the corner. The curser is diaginally 2 inches away? I have a 42 inch IR Touch Overlay using a 32 inch LCD monitor.

          Where can I set or adjust this? Any thoughts?

          Fun!

          i ask the same question my bro

          1 Reply Last reply Reply Quote 0
          • B Offline
            Bruno
            last edited by Mar 7, 2020, 9:26 PM

            @klimbo said in IR Touch Frame calibration:

            mple I can’t simply click on the R

            So, has anyone found a solution for this?
            I have a 32 inches mirror (and 32 inches touch frame) in a 18 inches screen. Since the touchframe is bigger than the screen i couldn’t find a way to calibrate it to just work on the 18 inches screen area (as I do when I calibrate it on Windows).

            Does anyone have any thoughts on how to do this?

            Thanks.

            1 Reply Last reply Reply Quote 0
            • B Offline
              Bruno
              last edited by Mar 8, 2020, 11:05 PM

              Here is a few more information.

              The picture below shows my mirror (with the 18’’ screen) and the 32’’ touch frame above it.
              (This is just a test mirror, that’s why the touch frame doesn’t match the mirror frame. And just ignore the painted part… it’s just some information i can’t share)

              Before calibrating it, the 18’’ screen is “mapped” to the whole 32’’ touch frame. That’s expected.

              ![alt text](0_1583708443439_IMG_20200308_194221.jpg image url)

              What I need to do is calibrate it so the only part of the touch frame that will recognize the touch is the area of the 18’’ screen.

              I run the command

              DISPLAY=:0.0 xinput_calibrator
              

              Then I calibrate the screen, like the picture below (clicking the four points)

              0_1583708645714_IMG_20200308_194250.jpg

              The output of the command is:

              Calibrating standard Xorg driver "Touch Device FC315WH00DL-CT-B2-20P"
                      current calibration values: min_x=0, max_x=65535 and min_y=0, max_y=65535
                      If these values are estimated wrong, either supply it manually with the --precalib option, or run the 'get_precalib.sh' script to automatically get it (through HAL).
              
              
              --> Making the calibration permanent 
                copy the snippet below into '/etc/X11/xorg.conf.d/99-calibration.conf'
              Section "InputClass"
                      Identifier      "calibration"
                      MatchProduct    "Touch Device FC315WH00DL-CT-B2-20P"
                      Option  "MinX"  "8770"
                      Option  "MaxX"  "46111"
                      Option  "MinY"  "5539"
                      Option  "MaxY"  "40880"
              EndSection
              

              But nothing changes… when I touch the screen again, the same thing is happening: the 18’’ screen is “mapped” for the whole 32’’ touchframe, not just the area of the 18’’ screen.

              I tried saving the code above both on /etc/X11/xorg.conf.d/99-calibration.conf and modifying the values of Min/Max X/Y (like changing from 46111 to 2000) but absolutely nothing changes… I think the touchframe is not using these values for anything.

              When I use the same touchframe on windows and use the calibration tool, it map my 21’’ PC monitor correctly for the 32’’ touch frame.

              I’ve been struggling with this for a few days and I see that a lot of people is having/had the same problem. Does anyone know a solution for this?

              Thanks.

              1 Reply Last reply Reply Quote 0
              • B Offline
                Bruno
                last edited by Bruno Mar 9, 2020, 10:36 PM Mar 9, 2020, 10:26 PM

                Ok, after a lot of hours searching and testing i finally figured it out.

                Forget about all that getting the values for minX, maxX, minY and maxY that all the sites talk about. Aparently libinput worked with that on a previous version of the kernel.

                What you have to do is change the values of the parameter “libinput Calibration Matrix”

                Steps:

                1. find your devices name (or id) with the command
                "xinput"
                

                If it fails with a message “Unable to connect to X server” just use before.

                export DISPLAY=:0.0
                

                Write down your devices name and id

                1. Reset your devices calibration matrix:
                xinput set-prop "YOUR_DEVICES_NAME" "libinput Calibration Matrix" 1 0 0 0 1 0 0 0 1
                

                (Obs: this “virgin” matrix above is for the screen WITHOUT ANY ROTATION. Just plain landscape mode, aka, “display_rotate=0” on /boot/config.txt
                I’ll talk about rotation below)

                1. Start xinput_calibrator on verbose mode:
                xinput_calibrator -v
                

                Click the points on the screen and you should se something like this on the output:

                DEBUG: Adding click 0 (X=181, Y=132)
                DEBUG: Adding click 1 (X=862, Y=129)
                DEBUG: Adding click 2 (X=186, Y=661)
                DEBUG: Adding click 3 (X=868, Y=665)
                

                We’ll need only the click0 and click3 X and Y

                1. Get your screen current resolution:
                xrandr | grep current
                

                You’ll see something like:

                Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
                
                1. Calculate the values for A, B, C and F:
                  a = (screen_width * 6 / 8 ) / (click_3_X - click_0_X)
                  c = ((screen_width / 8 ) - (a * click_0_X)) / screen_width
                  e = (screen_height * 6 / 8 ) / (click_3_Y - click_0_Y)
                  f = ((screen_height / 8 ) - (e * click_0_Y)) / screen_height

                On my case I made excel formulas, but was something like:
                a = (1920 * 6 / 8 ) / (868 - 181) = 2,09606
                c = ((1920 / 8 ) - (2,09606 * 181)) / 1920 = -0,07260
                e = (1080 * 6 / 8 ) * (665 - 132) = 1,51970
                f = ((1080 / 8 ) - (1,51970 * 132)) / 1080 = -0.06074

                (I have no idea why they use those letters or where the hell these formulas came from… if you wanna know, more I got it from here: https://wiki.archlinux.org/index.php/Calibrating_Touchscreen )

                1. Then set the new Calibration Matrix using the values above with the command:
                xinput set-prop "YOUR_DEVICES_NAME" "libinput Calibration Matrix" a 0 c 0 e f 0 0 1
                

                There you go. Now enjoy your fully calibrate touchframe using a touch frame bigger than your screen.

                1. To make it permanent:
                  Create the file: /etc/X11/xorg.conf.d/99-calibration.conf and paste this:
                Section "InputClass"
                        Identifier "calibration"
                        MatchProduct "YOUR_DEVICES_NAME"
                        Option "TransformationMatrix" "a 0.0 c 0.0 e f 0.0 0.0 1.0"
                EndSection
                

                (of course change your devices name and the values for a, c, e and f)

                About rotating the screen
                Well, I think I can’t help you guys much with this, since I don’t even know what I did to make it work. When you rotate the screen (display_rotate=X on /boot/config.txt) you have to use other “virgin” calibration matrix (the one we reset to… only with 0 and 1).
                If you wanna know more: maybe this site will help https://wayland.freedesktop.org/libinput/doc/1.11.3/absolute_axes.html

                I am using display_rotate=1
                So the “new matrix” is:
                0.0 1.0 0.0 -1.0 0.0 1.0 0.0 0.0 1.0
                (I had to put ‘.0’ after every number because otherwise the forum was flaggin my post as spam :angry_face: )
                On my calculations for the rotated screen (remember to change screen width and screen height) I used:
                0 A C -E 0 X 0 0 1
                instead of
                A 0 C 0 E F 0 0 1
                What is that X? Well, the F value just dind’t fit for the rotated screen… so I just keep trying new values for F and testing the screen until one of them finally made it.

                Well, I hope it helps somebody.
                See ya.

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                • B Offline
                  Bruno
                  last edited by Mar 9, 2020, 10:51 PM

                  Actually, the first link should be: https://wiki.archlinux.org/index.php/Talk:Calibrating_Touchscreen

                  I couldnt edit my post anymore because the forum is still thinking this is spam…

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                  • M Offline
                    mrSnatz
                    last edited by Apr 13, 2020, 8:54 AM

                    Thank you for your instructions. Unfortunately, this does not work for me. I have a 42 “frame over a 32” monitor.
                    The monitor is only a part of the touch frame area.
                    According to your instructions, no error message appears, but the ratio does not fit in the calibration. Do you have a tip for me here?

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