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    Hysteresis for fans in thermostatic mode

    Firmware wishlist
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    • deckingman
      deckingman last edited by

      This is no big deal so very low priority but I've noticed that some of my fans can become very "busy" switching on and off when the monitored temperature channel is at the switching temperature. It would be quite nice if there was a bit of hysteresis so that the temperature has to drop (say) half a degree below the set temperature before the fan switches off. Half a degree would work well for me but I guess ideally the hysteresis ought to be user configurable.

      Ian
      https://somei3deas.wordpress.com/
      https://www.youtube.com/@deckingman

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      • dc42
        dc42 administrators last edited by

        I have it on my list to allow the PWM to be varied depending on the temperature.

        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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        • deckingman
          deckingman last edited by

          Thanks David. However, some fans don't work well with PWM so half a degree or so of hysteresis between fan on temperature and fan off temperature might still be useful (but only if it's not a great deal of work).

          Ian
          https://somei3deas.wordpress.com/
          https://www.youtube.com/@deckingman

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          • dc42
            dc42 administrators last edited by

            I guess I should allow you to provide min and max temperatures, and either smooth PWM between them or or on/off at them.

            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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            • deckingman
              deckingman last edited by

              @dc42:

              I guess I should allow you to provide min and max temperatures, and either smooth PWM between them or or on/off at them.

              I'd say that would cover all eventualities for all users. As I said, it's not a huge issue - just a "would be nice to have" at some time in the future.

              Ian
              https://somei3deas.wordpress.com/
              https://www.youtube.com/@deckingman

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