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QT Creator Serial Port Plotter

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  • mrjjM mrjj

    @priscilla-v

    Hi
    Its controlled via the QCPAxisTicker
    Im not sure if you mean the Big Ticks or the Sub Ticks.
    There is lots of info here
    https://www.qcustomplot.com/index.php/tutorials/basicplotting

    Anyway for the big Ticks.
    if you add to
    void MainWindow::setupPlot()
    around line 220

    QSharedPointer<QCPAxisTickerFixed> fixedTicker(new QCPAxisTickerFixed);
        ui->plot->xAxis->setTicker(fixedTicker);
        fixedTicker->setTickStep(40.0);
        fixedTicker->setScaleStrategy(QCPAxisTickerFixed::ssNone); 
    

    It looks like this
    alt text
    Which might be what you want.

    • Y axis to be a square,
      Well that depends entirely on the y range and step versus the x
      alt text

    • "Plot Controls" new default values.
      You can click on the UI file and alter them there
      alt text

    priscilla vP Offline
    priscilla vP Offline
    priscilla v
    wrote on last edited by
    #13

    @mrjj Thank you so much :D

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    0
    • priscilla vP Offline
      priscilla vP Offline
      priscilla v
      wrote on last edited by
      #14

      Hi, how would you get each frame of the small ones to measure 40 milliseconds? I was trying but I can not achieve it.

      0_1545612001544_Captura.PNG

      mrjjM 1 Reply Last reply
      0
      • priscilla vP priscilla v

        Hi, how would you get each frame of the small ones to measure 40 milliseconds? I was trying but I can not achieve it.

        0_1545612001544_Captura.PNG

        mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by
        #15

        @priscilla-v
        Hi
        Im not sure how to get change that.
        You could try ask here
        https://www.qcustomplot.com/index.php/support/forum/
        Its the actual plotter being used in the project.

        priscilla vP 2 Replies Last reply
        0
        • mrjjM mrjj

          @priscilla-v
          Hi
          Im not sure how to get change that.
          You could try ask here
          https://www.qcustomplot.com/index.php/support/forum/
          Its the actual plotter being used in the project.

          priscilla vP Offline
          priscilla vP Offline
          priscilla v
          wrote on last edited by priscilla v
          #16

          @mrjj
          Hi, I managed to change the little squares values to 40ms, which is what I needed, though it only look like this when I haven't clicked the Play button. I commented line 208, and add the code in line 210.

          0_1545872017777_Code_changed.PNG

          When clicked, it changes all the x-axis configuration.
          Do you know why is this happening?

          When I run the program

          0_1545871775695_before.PNG

          When I click play button

          0_1545871786170_After.PNG

          (I don't mind the numbers written in the scale like 0.25, 0.5 , 0.75 or 50, 100, 150 etc I just calculated that 20 of those I think they are called ticks is equivalent to 4 seconds, and each one has 5 subticks so, when i did the math realize that each subtick would be 40ms that way)

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          0
          • mrjjM mrjj

            @priscilla-v
            Hi
            Im not sure how to get change that.
            You could try ask here
            https://www.qcustomplot.com/index.php/support/forum/
            Its the actual plotter being used in the project.

            priscilla vP Offline
            priscilla vP Offline
            priscilla v
            wrote on last edited by
            #17

            @mrjj Excuse one more question, how could you achieve a 50 Hz low pass filter in this serial plotter software?

            mrjjM 1 Reply Last reply
            0
            • priscilla vP priscilla v

              @mrjj Excuse one more question, how could you achieve a 50 Hz low pass filter in this serial plotter software?

              mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #18

              @priscilla-v
              Hi welcome back
              funny enough, its being discussed here
              https://forum.qt.io/topic/98570/implement-low-pass-filter
              for same program :)

              1 Reply Last reply
              1
              • priscilla vP Offline
                priscilla vP Offline
                priscilla v
                wrote on last edited by
                #19

                This is my ECG in a noise-free environment.

                0_1547678218132_3036.png

                When the charger is connected to the PC but not to the power outlet.
                0_1547678256288_14874.png

                When the PC is near any outlet.
                0_1547678293057_1483.png

                When the PC is connected to the electrical network.0_1547678317653_803.png

                I tried to use this piece of code but there was no change.

                0_1547678344924_Captura.PNG

                1 Reply Last reply
                0
                • mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by
                  #20

                  Hi
                  well it seems the code only
                  does an assignment to a double variable.
                  Where is the actual filter function ?

                  1 Reply Last reply
                  0
                  • priscilla vP Offline
                    priscilla vP Offline
                    priscilla v
                    wrote on last edited by
                    #21

                    It returns this error

                    0_1547679233571_Captura.PNG

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                    0
                    • mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by
                      #22

                      Hi
                      oh, you have to move the function outside ( over ) the current function.
                      you define a function inside other function which it complains about.

                      1 Reply Last reply
                      2
                      • priscilla vP Offline
                        priscilla vP Offline
                        priscilla v
                        wrote on last edited by
                        #23

                        Thank you very much for all the help in this forum, it was very helpful. :)

                        ZgemboZ 1 Reply Last reply
                        0
                        • priscilla vP priscilla v

                          Thank you very much for all the help in this forum, it was very helpful. :)

                          ZgemboZ Offline
                          ZgemboZ Offline
                          Zgembo
                          wrote on last edited by
                          #24

                          @priscilla-v said in QT Creator Serial Port Plotter:

                          Thank you very much for all the help in this forum, it was very helpful. :)

                          Hi! Did you manage to make fixed tick and subtick count? I need to have ticks every 10mm and subticks every 2mm.

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