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    Mini height sensor Having Problems

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    Duet Hardware and wiring
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    • dc42undefined
      dc42 administrators
      last edited by

      M558 P1 is correct. Can you post a photo showing the connections you have made at both ends of the cable?

      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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      • jnolan72undefined
        jnolan72
        last edited by

        Sensor Wiring
        Out GND VCC
        White Black Brown

        Wire to Wire Connector
        From
        White Black Brown
        To
        White Black Red

        To the Duet Wifi

        Z Probe IN GND Z_Probe_MOD +3.3V
        White Black Red

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        • dc42undefined
          dc42 administrators
          last edited by

          Your connections look correct to me. Please check the displayed readings again. You should get a reading near zero when there is no surface near the sensor, about 465 when there is a surface close but the LED is not on, and a value around 535 when the red LED is on. If you are seeing 468 all the time, then either the web interface is not updating or there is a bad connection somewhere in the white wire.

          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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          • jnolan72undefined
            jnolan72
            last edited by

            Found 1 problem my Z Probe IN Wire that was reading several M OHM's (Replaced)

            The wire itself was the problem not the connector.

            Thanks

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            • dc42undefined
              dc42 administrators
              last edited by

              You should get 4 flashes using M558 P1, or 2 flashes if you use M558 P5.

              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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              • jnolan72undefined
                jnolan72
                last edited by

                Ok I think I have this figured out
                I was trying the command by sending gcode through the web not in the config.g

                Once I put the commands in config.g
                On reboot I got 4 flashes and it looks like it is working.
                I will be testing more tomorrow after I remount and rewire it back in place

                This bring up a few question
                1. on boot up does the sensor output become a input to read the config from the duetwifi in the first 4 seconds?
                2. Is this only done at bootup or can this be triggered at any time?
                3. Does the sensor use all 6 Z probe modes?
                4. What does each flash mean 1,2,3,4,?
                5. Is there a place I can read these details

                Thanks

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                • dc42undefined
                  dc42 administrators
                  last edited by

                  1. Yes, it looks to see if there is a pullup resistor on that pin.
                  2. Only at boot time
                  3. It is intended for use in mode 1. You could use it in mode 5, then you should get 2 flashes.
                  4. 2 flashes mean it's detected a pullup resistor and started in digital mode, 4 flashes means no pullup resistor detected and it is in analog mode. After that, rapid flashing means the phototransistor is saturated e.g. due to bright sunlight reflecting off the bed into the sensor.
                  5. https://miscsolutions.wordpress.com/mini-height-sensor-board/

                  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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                  • Merlinundefined
                    Merlin
                    last edited by

                    Duet Wifi v1.0 with 1.81 firmware; T3P3 hot end printed part with brass inserts , version for All Metal effector.
                    dc42 IR Sensor , new version with surface IR emitters and detector. 24V psu
                    E3D V6 hot end with new heater block for cartridge thermister and silicone sock.
                    T3P3 glass bed with black paper.

                    Sensor flashes 4 times on power up , and reads 537 when white paper triggers red light.
                    Using feeler gauges the height between bottom edge of IR sensor board and the hot end nozzle tip is about 2.4mm
                    The problem is that with no white and in a darkened room, after calibrating G92 Z0 to cartridge paper thickness =-
                    the Z probe reading stays at 465 and never triggers the sensor fully so nozzle end hits glass bed!
                    Does this simply mean the trigger height is less then 2.4mm?
                    With this hardware configuration I cannot see any easy way to reduce the distance between ir sensor and nozzle tip.
                    Anyone any ideas?

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                    • Merlinundefined
                      Merlin
                      last edited by

                      I have a workaround.
                      I took 0.8mm off the unthreaded end of the heat break.
                      now the IR sensor fires at z=0.35mm, so before the nozzle hits the bed glass

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                      • dc42undefined
                        dc42 administrators
                        last edited by

                        I'm glad you fixed it. The fitting instructions for the IR sensor suggest that you aim to have the bottom of the board 1.5mm higher than the tip of the nozzle.

                        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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