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    Using Heat Bed Output as IO Pin

    Duet Hardware and wiring
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    • PayTor
      PayTor last edited by

      Hi, I'm trying to use the heat bed output of a DuetEthernet as a regular IO. I've used "M307 H0 A-1 C-1 D-1" command to disable the bed heater first. I can actually confirm that it's disabled with "M307 H0". But then when I use "M42 P0 S255" to turn it on manually, the bed heat LED on the board flashes and turns off quickly. Is there anything I'm missing here? I can control all other heater outputs like this (E0-E6). Bed heater is the only one I can't control.

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      • dc42
        dc42 administrators last edited by

        You may need to send M140 H-1 to tell the firmware that there is no bed heater.

        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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        • PayTor
          PayTor last edited by

          M140 H-1 removes the Bed Heater temperature control box from the web interface, but still the same issue. The LED flashes for second and turns off.

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          • dc42
            dc42 administrators last edited by

            I have confirmed this as a bug, and I will try to include a fix in 1.19beta11.

            Edit: I found the problem. Temporary workaround: put the M140 H-1 command earlier in config.g than your M563 tool definition commands.

            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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            • PayTor
              PayTor last edited by

              I don't have an M563 tool definition command. I put M140 H-1 on top of my config.g, still didn't work.

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              • dc42
                dc42 administrators last edited by

                After your M140 H-1 command, create a tool with M563, then delete it.

                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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                • PayTor
                  PayTor last edited by

                  Works perfectly, Thanks.

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                  • dc42
                    dc42 administrators last edited by

                    Fixed in 1.19beta10+2 which I released earlier today.

                    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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