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    Flashing BLTouch

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    Duet Hardware and wiring
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    • crchisholmundefined
      crchisholm
      last edited by crchisholm

      I have posted about this on the RepRap forum, but probable should have started here.

      Duet WiFi, 24v, CoreXY.

      I am having a problem with BLTouch. It was working perfectly for a couple of weeks and then started flashing and became unresponsive. On the reprap forum, it was suggested that the voltages might be off but I checked and I have a consistent 5.01v on the red wire and 3.28v on the white wire which I think is within spec. I was printing just fine before this started. When I couldn’t figure anything out, I swapped the flashing BLt for another and seemed to be working. I started going through the calibration step in the duet docs and after running G30 S-1, the new one started flashing and now it to is unresponsive. Cycling power does nothing.

      Either I have just blown a second BLt, or the problem is not with the device. Can anyone offer some help?

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      • crchisholmundefined
        crchisholm
        last edited by

        Additional info: came back from dinner and powered up the duet. The BLtouch was not flashing but I tried to home z and the bed rose but the BLTouch did not deploy. I then tried g30 and got the message that the probe was already triggered at the start of the probing.

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        • Phaedruxundefined
          Phaedrux Moderator
          last edited by

          Considering that it seems to happen across multiple BLTouch I would focus on checking the wiring. Either a bad crimp or intermittent failure.

          Z-Bot CoreXY Build | Thingiverse Profile

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          • crchisholmundefined
            crchisholm
            last edited by

            Yep, I think that’s a good suggestion. I inspected the terminations and wires, but would probably be a good idea to re-terminate them. I am kind of thinking the 2 wire (black and white) would be a good starting place. That one has the cheesiest connector.

            Tomorrow’s business. I’ve reached today’s frustration quota.☹

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            • antlestxpundefined
              antlestxp
              last edited by

              are you getting a fast red flash or a slow flash?

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              • dc42undefined
                dc42 administrators
                last edited by

                BLTouch flashes when it is in an error state. I'm not sure exactly what causes this, but I think one of them is deploying the probe when it is too close to the bed.

                You can send command M280 Px S160 (choose the value of x and add I1 or not according to your configuration) to reset the error. Some users include this in their config.g and homing files.

                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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                • Vetiundefined
                  Veti
                  last edited by

                  see
                  https://www.youtube.com/watch?v=wq5QmN-MIJA

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                  • antlestxpundefined
                    antlestxp
                    last edited by

                    There are 2 error states for the bltouch. a rapid flash is a mechanical issue. either the magnet is out of place when retracted or there is an issue with it moving. there is a a slower red flash that is for a wiring or connection error. either its wired wrong or it detects a random short. this is for the v2 v2.1 as far as i know.

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                    • crchisholmundefined
                      crchisholm
                      last edited by

                      Well, turns out there was a wiring/termination issue. I re-terminated the wires (black and white) and everything worked great. Thanks for all the suggestions.

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