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    change microswitch to a light barrier

    Tuning and tweaking
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    • ICY_SNAKE
      ICY_SNAKE last edited by

      Hello,

      i am new here.
      My printer is a modix 60 V3.
      There is a DUET board installed.
      The modix Printer does not have Z-Stop switch.
      (so without it could destroy my hotend)
      I like to add a light barrier. (also like to replace the microswitches for X&Y)
      Does anyone already have it? Any info installing a light barrier instead of a microswitch?

      Thx for your help
      Dieter

      DO IT OR DON'T

      T3P3Tony o_lampe 2 Replies Last reply Reply Quote 0
      • T3P3Tony
        T3P3Tony administrators @ICY_SNAKE last edited by

        @icy_snake you an use pretty much anything that can switch a 3.3V IOn.in from 0 to 3.3V or from 3.3V to 0V to act as a "switch" in this case. So a simple microswitch is used to connect an IOn.in to ground as an endstop. So the question is what options for outputs do the light barriers you are looking at have. Also how would you integrate them into the mechanics of the printer?

        www.duet3d.com

        T3P3Tony ICY_SNAKE 2 Replies Last reply Reply Quote 0
        • mrehorstdmd
          mrehorstdmd last edited by

          I put opto endstops in all three axes in my printer and ran tests of the precision- they came out excellent.

          Blog posts here:
          https://drmrehorst.blogspot.com/2020/01/ummd-gets-opto-endstops.html
          https://drmrehorst.blogspot.com/2020/03/testing-ummds-xy-optical-endstops.html
          https://drmrehorst.blogspot.com/2020/03/a-new-z-axis-optical-endstop-design-for.html
          https://drmrehorst.blogspot.com/2020/03/testing-ummds-new-z-axis-optical.html

          https://drmrehorst.blogspot.com/

          1 Reply Last reply Reply Quote 3
          • o_lampe
            o_lampe @ICY_SNAKE last edited by o_lampe

            @icy_snake Beam brakers (light barrier = Lichtschranke in German) are easy to use. You have to supply 3.3 or 5V, which is the only difference to some microswitches. The signal is often inverted, so you have to check endstops with M119 and perhaps use M574 X? S? P"!xstop" etc. (the ! inverts the signal)

            1 Reply Last reply Reply Quote 1
            • T3P3Tony
              T3P3Tony administrators @T3P3Tony last edited by

              @ICY_SNAKE I has a light curtain in mind as opposed to an opto switch. If you mean a opto switch then as has already been said there are used frequently.

              If you mean a light curtain across the whole bed - thats a different story!

              www.duet3d.com

              1 Reply Last reply Reply Quote 1
              • ICY_SNAKE
                ICY_SNAKE @T3P3Tony last edited by

                @t3p3tony Hello Tony,
                i will print some brackets to hold the pcb with the beam braker.

                Thats what I would use.
                https://www.amazon.com/gp/product/B07JMDLD84/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

                DO IT OR DON'T

                T3P3Tony mrehorstdmd 2 Replies Last reply Reply Quote 0
                • dc42
                  dc42 administrators last edited by

                  @icy_snake see https://duet3d.dozuki.com/Wiki/Connecting_endstop_switches#Section_3_3V_compatible_optical_endstop.

                  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

                  1 Reply Last reply Reply Quote 1
                  • T3P3Tony
                    T3P3Tony administrators @ICY_SNAKE last edited by

                    @icy_snake ahh ok yes, just a confusion in terminology - these are optical endstops as we call them. dc42 linked to the documentaiton for them.

                    www.duet3d.com

                    1 Reply Last reply Reply Quote 1
                    • mrehorstdmd
                      mrehorstdmd @ICY_SNAKE last edited by mrehorstdmd

                      @icy_snake I show those opto endstops as currently unavailable, but there are other suppliers who make the same thing. Look for the LM393 comparator chip on whatever devices you use. That chip switches the output between logic 0 and 1 very quickly and I think that is responsible for the high precision of the endstops.

                      This one uses the LM393 comparator

                      https://drmrehorst.blogspot.com/

                      1 Reply Last reply Reply Quote 1
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