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    Bad read value from dc42 IR sensor

    IR Height Sensor
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    • Charpy
      Charpy last edited by

      Hi everyone,

      For my core XY I' work on a duet 2 wifi rev 1.02+ with the 2.05 firmware and the wifi version is 1.23.

      Here is my problem : My sensor never give me a read value of 465 or 535 but directly 986 and it stay's like that...
      In result i have very bad accurency when probing...

      The sensor flaches 4 times at start up and the led light's up correctly when probing.
      I've tried different surfaces like hand, black tape, white paper and different ambiant light but the result is the same...

      i've define like this in my config.g file :

      M558 P1 X0 Y0 Z1 F100 T2400 H3 A3
      M557 X10:440 Y10:530 S30:30
      G31 P500 X3 Y108 Z2.160

      Thank's in advence !
      Charpy

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      • Phaedrux
        Phaedrux Moderator last edited by

        Try increasing your dive height from H3 to H10 and see if it improves.

        Z-Bot CoreXY Build | Thingiverse Profile

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        • Charpy
          Charpy last edited by

          Thank's for your answer !
          I have the same result : the value of the probe is the same : 986...

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          • Phaedrux
            Phaedrux Moderator last edited by

            Is this a new probe?

            Z-Bot CoreXY Build | Thingiverse Profile

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            • Charpy
              Charpy last edited by

              I hope ! i've buy it last 2 month on RepRapworld.com
              On the back of the pcb it's writed ver1.3.

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              • Phaedrux
                Phaedrux Moderator last edited by

                Can you try cleaning the sensor gently with a cotton bud and some isopropyl?

                Z-Bot CoreXY Build | Thingiverse Profile

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                • Charpy
                  Charpy last edited by

                  I did it,
                  Now the result is 984

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                  • Charpy
                    Charpy last edited by

                    Finally I found it!
                    based on the diagram here: https://raw.githubusercontent.com/dc42/OrmerodSensorBoard/master/SchematicAndPCB/Mini-differential-IR/V1.2/schematic.png

                    I saw that the value of the R5 resistor was +10M ohms.
                    In fact the resistor was poorly soldered and is not possible to see it with naked eye!

                    Now the probe read correctly 465 and 535.
                    Luckly i'm not bad with electronics. someone else would just have tossed it in the trash! ...

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                    • Phaedrux
                      Phaedrux Moderator last edited by

                      Well done!

                      Z-Bot CoreXY Build | Thingiverse Profile

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                      • Charpy
                        Charpy last edited by Charpy

                        I still have a mistake...
                        I've leveled my bed as best as i can by hand but the height map look like this :2020-05-07 15_59_03-CoreXY.png

                        And is impossible I have 1.4 mm higher on the back
                        The probe seems to "drift" by the time. (as you can see on the X moves)
                        I tried other cables and different microstepping setup but the result is the same
                        This is possible ?
                        Any idears ?

                        thank's in advence

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                        • Charpy
                          Charpy last edited by

                          It is possible that the sensor is damaged by the bad solder of the resistance ?

                          I think i have tried all i can do... I need some help ! ...

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                          • Phaedrux
                            Phaedrux Moderator last edited by

                            I'm affraid it may be time to replace the probe.

                            Z-Bot CoreXY Build | Thingiverse Profile

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