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    Problem with IR sensor

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    IR Height Sensor
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    • AlexLinundefined
      AlexLin
      last edited by

      O and I have this config.c…....as it came from the reprap config
      ; Z-Probe
      M574 Z1 S2 ; Set endstops controlled by probe
      M558 P1 H5 F120 T6000 ; Set Z probe type to unmodulated and the dive height + speeds
      G31 P500 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height
      M557 X15:285 Y15:285 S20 ; Define mesh grid

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      • dc42undefined
        dc42 administrators
        last edited by

        Most likely you have connected the OUT pin of the sensor to the wrong pin on the Z probe connector (it should go to the IN pin), or there is a bad crimp connection in that 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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        • AlexLinundefined
          AlexLin
          last edited by

          I suspected that yes…since when I measure volt on out and gnd I measure 0.09V and the value drops to 37
          I did recrimp the out and it is connected to the in on the duet...........
          And I did measure ohm between the underside of the sensor to the underside of the connector on the duet and it is 0 ohm....

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          • dc42undefined
            dc42 administrators
            last edited by

            I guess it's possible that the OUT pin of your sensor isn't properly soldered to the PCB, although it must have passed testing.

            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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            • AlexLinundefined
              AlexLin
              last edited by

              O and it triggers when I get close to the sensor(red led) so yes it must be something with the out signal. See photos for connections
              http://photo.aletronix.com/Other/3D-printing/i-rKBHdgT/A
              http://photo.aletronix.com/Other/3D-printing/i-24HGbtC/A
              had to solder to the sensor, since I don't have enough space for the connector

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              • AlexLinundefined
                AlexLin
                last edited by

                solved….R4 on the sensor was badly soldered....soldered both sides and seems to give sensible data 0 when far from bed but always 985 when close...no values in between. Duet detects it as z-stop.
                Shouldn't the values vary?

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                • dc42undefined
                  dc42 administrators
                  last edited by

                  I am glad you solved it. However, both R4 and R5 would have to be open circuit to give the original symptom. So please check R5 too.

                  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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                  • AlexLinundefined
                    AlexLin
                    last edited by

                    Well , the LED worked so R5 is fine. Only out didn't work. But I checked and resoldered R5 and R4 under a microscope and it looks fine now…..C1 is supposed to be not mounted I suppose

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                    • dc42undefined
                      dc42 administrators
                      last edited by

                      R5 doesn't affect the LED, it's R6 that does. R5 is the resistor next to L1. C1 is not mounted.

                      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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                      • AlexLinundefined
                        AlexLin
                        last edited by

                        A indeed sorry… I'll check r5 too

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