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    Duet WiFi fan confusion

    Duet Hardware and wiring
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    • Asdasd1234
      Asdasd1234 last edited by

      Hi all,

      I'm trying to get a fan working to go into the housing for the Wifi board. but I only need it running at half speed if that (its a pretty beefy fan for its job)

      It's a 4 wire 12v fan.

      I've connected just the Vin and ground to the FAN1 connector on the board.

      I can only make it turn on with this command "M106 P1 I1" The I1 part is needed or it doesn't work. And S0.1-1 or S50/S100/S255 have no affect on speed.

      How do I slow down this fan?

      All help appreciated!

      Many Thanks

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      • dc42
        dc42 administrators last edited by

        Connect the red and black wires to an always on fan connector, and the PWM wire to the FAN- pin of your chosen fan connector. Use parameter I1 innthe M106 command to invert the polarity.

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        • Asdasd1234
          Asdasd1234 last edited by

          I'll try that and report back, cheers!

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          • biscuitlad
            biscuitlad last edited by

            Isn't P1 defined to be a thermostatically controlled by default? You need to disable it first:

            M106 P1 H-1

            Then send your variable rate.

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