Hotend fan software controlled?

Discussion in 'E3D-v6 and Lite6' started by sungod3k, Feb 11, 2015.

  1. sungod3k

    sungod3k Active Member

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    Hi,

    the hotend fan is a 2 wire fan and therefore hard to turn on and off by software. With a 3 wire fan one could just use and analog pin to control the signal wire, is there a know way to include a some sort of software switch with the aux pins?

    Chees
     
  2. elmoret

    elmoret Administrator

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    1.) The hotend fan should be always on.
    2.) You don't control the signal wire on a 3-pin fan, you measure it. It is for feeding back RPM data.
     
  3. Mike Kelly

    Mike Kelly Volunteer

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    In marlin firmware you can enable the hot end fan using the auto-cooling settings in the configuration_adv.h file. You define which pin you want to control it from, the temperature it enables at (50), and the fan speed (255).

    You'd need a MOSFET circuit and 12v supplied on the power side or a RRD fan extender.
     
  4. sungod3k

    sungod3k Active Member

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    @elmoret
    1) I just dont want to walk a across the room all the time to shut the machine of just because the fan is so loud.
    2) didnt know that, thanks

    @mkelly
    I found a similar thing with a relay linked to m42. ill check it out.
     

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