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    Runoff 3.3V on expansion socket

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    • bigsub
      bigsub last edited by bigsub

      Hi to all, I bought a pcb relay board as this attached. It runs ok, but I'd like to runoff the psu (so the relais) at end of a print job or remotely instead of by a hand switch on 3.3V wire.
      I check with M81 but it seems that the only way to runoff the relais is putting off the 3.3V. Is there a way, via gcode, to cut 3.3V on expansion socket?
      Anyway, I don't know why this board wants also the ps_on wire.

      Any ideas?

      1817935b-fce9-41ca-8589-a4da9792c216-image.png

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      • dc42
        dc42 administrators last edited by dc42

        My impression is that you have purchased one of the few relay boards that doesn't have optically isolated inputs; but I can't be certain from the photos you have posted. Please provide a link to the datasheet or seller's page for that relay module.

        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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        • bigsub
          bigsub @dc42 last edited by

          @dc42 said in Runoff 3.3V on expansion socket:

          My impression is that you have purchased one of the few relay boards that doesn't have optically isolated inputs; but I can't be certain form the photos you have posted. Please provide a link to the datasheet or seller's page for that relay module.

          Hello, I finally choosed a simple relay board optically isolated as written in other posts here.

          BTW, this is the link of the object in aliexpress

          https://it.aliexpress.com/item/32974992635.html?spm=a2g0s.9042311.0.0.27424c4dYNXVMk

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