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    NPN sensor problem

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    • Petr Kundefined
      Petr K @fcwilt
      last edited by

      @fcwilt said in NPN sensor problem:

      M558 P5 C"^!zprobe.in" H5 F120 T6000

      Z probe value 1000, when triggered value is 0

      fcwiltundefined 1 Reply Last reply Reply Quote 0
      • fcwiltundefined
        fcwilt @Petr K
        last edited by

        @petr-k said in NPN sensor problem:

        @fcwilt said in NPN sensor problem:

        M558 P5 C"^!zprobe.in" H5 F120 T6000

        Z probe value 1000, when triggered value is 0

        Was that with the ! character or without?

        Frederick

        Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

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        • Petr Kundefined
          Petr K @fcwilt
          last edited by

          @fcwilt M558 P5 C"^zprobe.in" H5 F120 T6000

          fcwiltundefined 1 Reply Last reply Reply Quote 0
          • fcwiltundefined
            fcwilt @Petr K
            last edited by

            @petr-k said in NPN sensor problem:

            @fcwilt M558 P5 C"^zprobe.in" H5 F120 T6000

            Well then it should work with the ! unless the the output voltage of the sensor simply isn't meeting the logic levels needed of the input.

            What is the forward voltage drop of that diode?

            Did you try it without the diode?

            As I recall the logic 0 voltage level for the input is appx 0.8 volts. It's possible the combination of the drop across the NPN transistor in the sensor and the diode fails to meet that logic 0 level.

            Frederick

            Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

            Petr Kundefined 1 Reply Last reply Reply Quote 1
            • Petr Kundefined
              Petr K @fcwilt
              last edited by

              @fcwilt I try it without diode too, but it was the same, nothing changed.

              fcwiltundefined dc42undefined 2 Replies Last reply Reply Quote 0
              • fcwiltundefined
                fcwilt @Petr K
                last edited by

                @petr-k said in NPN sensor problem:

                @fcwilt I try it without diode too, but it was the same, nothing changed.

                Do you have a way to measure the voltage at the input to the board to verify the low (sensor triggered) and high (sensor not triggered) voltage levels

                Frederick

                Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

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                • Phaedruxundefined
                  Phaedrux Moderator @Petr K
                  last edited by

                  @petr-k said in NPN sensor problem:

                  M584 M584 X0 Y1 Z2:4 E3 ; set drive mapping

                  You have M584 twice on that line.

                  Z-Bot CoreXY Build | Thingiverse Profile

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                  • Petr Kundefined
                    Petr K @fcwilt
                    last edited by

                    @fcwilt
                    IMG_20210828_094804_New.jpg

                    IMG_20210828_094840_New.jpg

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                    • dc42undefined
                      dc42 administrators @Petr K
                      last edited by dc42

                      @petr-k if you have a multimeter then as @fcwilt suggested, you should measure the voltage between the IN pin and GND pins of the Z Probe connector. You should get:

                      • With the sensor not connected: nearly 3.3V (and DWC should report the Z probe reading as 0). If you don't read 3.3V then most likely your M558 command is wrong.
                      • With the sensor connected but not triggered: same (except that if the sensor includes a pullup resistor, you may get a higher voltage than 3.3V)
                      • With the sensor connected and triggered: about 0.2V if you don't use the diode, or 0.5V if you do.

                      Edit: in your photo it looks as though you may be using 2 diodes connected in series.

                      Duet WiFi hardware designer and firmware engineer
                      Please do not ask me for Duet support via PM or email, use the forum
                      http://www.escher3d.com, https://miscsolutions.wordpress.com

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                      • Petr Kundefined
                        Petr K @dc42
                        last edited by

                        @dc42

                        sensor connected, not triggered - 3.0V
                        sensor connected, triggered - 0V
                        sensor disconnected, not triggered - 0V
                        sensor disconnected, triggered - 1,5 V

                        All with diode.

                        My soldering looks like a second diode šŸ˜„

                        Petr Kundefined 1 Reply Last reply Reply Quote 0
                        • Petr Kundefined
                          Petr K @Petr K
                          last edited by

                          G31 X35 Y-4 Z0 P500 was the problem, I had two parameters P (P0 and P500), now works great

                          Petr Kundefined 1 Reply Last reply Reply Quote 2
                          • Petr Kundefined
                            Petr K @Petr K
                            last edited by

                            @petr-k And P≠0

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