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    E1 as 12v pwm

    Tuning and tweaking
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    • mfoltz
      mfoltz last edited by

      I am wanting to add some 12v leds for lighting and 3 extra fans for stepper cooling and was wondering if I could use my unused E1 heater terminals to control these? I would like to inject g code with my slicer to turn them on and off with a print.
      I thought of using one of my pwm fan pins but they are all already in use.

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      • dc42
        dc42 administrators last edited by

        Yes you can, using the M42 command. See https://duet3d.com/wiki/Using_servos_and_controlling_unused_I/O_pins.

        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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        • mfoltz
          mfoltz last edited by

          would I use M42 P? S1

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          • dc42
            dc42 administrators last edited by

            Yes, S1 to turn them on, S0 to turn them off, or something in between to turn them on at reduced brightness.

            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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            • mfoltz
              mfoltz last edited by

              what would the P parameter be for the E1 heater pin?

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              • dc42
                dc42 administrators last edited by

                E1 heater is heater 2, so it would be P2 as described in the wiki page I linked to.

                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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                • mfoltz
                  mfoltz last edited by

                  Just wanted to double check. Thanks You are a big part of what makes duet so great.

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                  • mfoltz
                    mfoltz last edited by

                    Just tried it sent M305 H2 A-1 C-1 D- and then when I send M42 P2 S1 I get the error message M42 P2 S1
                    Error: Logical pin 2 is not available for writing.

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                    • dc42
                      dc42 administrators last edited by

                      It's M307 you need not M305.

                      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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