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Mini height sensor Having Problems

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Duet Hardware and wiring
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  • undefined
    jnolan72
    last edited by 26 Apr 2017, 22:45

    I have Mini differential IR sensor by dc42
    FIrst Problem (Fixed)on power up is flashes 2 time not 4.
    I move Z Probe In to Z Probe_Mod and set M558 P1
    Got 4 flashes

    Does not matter if Z probe or Z Probe_mod is wired

    Now I
    M558 P1 and G31 P500 Z1.0
    and P2 and P3
    It only shows 468 no matter what the height is Z

    The Red Light goes on at the correct height

    My Bed is a Black aluminum Heat bed with Glass on top, using glue stick on top of that

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    • undefined
      dc42 administrators
      last edited by 27 Apr 2017, 05:49

      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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      • undefined
        jnolan72
        last edited by 27 Apr 2017, 10:29

        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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        • undefined
          dc42 administrators
          last edited by 27 Apr 2017, 13:32

          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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          • undefined
            jnolan72
            last edited by 27 Apr 2017, 19:44

            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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            • undefined
              dc42 administrators
              last edited by 27 Apr 2017, 22:04

              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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              • undefined
                jnolan72
                last edited by 28 Apr 2017, 01:11

                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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                • undefined
                  dc42 administrators
                  last edited by 28 Apr 2017, 11:54

                  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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                  • undefined
                    Merlin
                    last edited by 5 May 2017, 15:27 5 May 2017, 15:26

                    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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                    • undefined
                      Merlin
                      last edited by 7 May 2017, 11:40

                      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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                      • undefined
                        dc42 administrators
                        last edited by 7 May 2017, 19:43

                        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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