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Problem with IR sensor

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IR Height Sensor
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  • undefined
    AlexLin
    last edited by 28 Feb 2018, 18:07

    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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    • undefined
      dc42 administrators
      last edited by 28 Feb 2018, 18:22

      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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      • undefined
        AlexLin
        last edited by 28 Feb 2018, 18:32

        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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        • undefined
          dc42 administrators
          last edited by 28 Feb 2018, 18:41

          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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          • undefined
            AlexLin
            last edited by 28 Feb 2018, 18:44

            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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            • undefined
              AlexLin
              last edited by 28 Feb 2018, 19:04

              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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              • undefined
                dc42 administrators
                last edited by 28 Feb 2018, 21:26

                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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                • undefined
                  AlexLin
                  last edited by 1 Mar 2018, 07:03

                  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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                  • undefined
                    dc42 administrators
                    last edited by 1 Mar 2018, 10:35

                    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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                    • undefined
                      AlexLin
                      last edited by 1 Mar 2018, 15:43

                      A indeed sorry… I'll check r5 too

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