Can a PWM Fan connection be used for Duet WiFi enclosure fan?



  • I wanted to add a fan to my Duet WiFi enclosure (https://www.thingiverse.com/make:274016) , but I'm using both always on fan connections - 1 for the hotend fan, and 1 for my LED lights.

    Can I somehow use a PWM Fan connections - and maybe even set it only to come on when the Duet board gets to a certain temp?


  • administrators

    If you connect an electronics cooling fan to a controlled fan output, at present you can't control it automatically but this is planned for the future. For now you can just turn it on using an M106 command in config.g.



  • Excellent - Thank you



  • @dc42:

    If you connect an electronics cooling fan to a controlled fan output, at present you can't control it automatically but this is planned for the future. For now you can just turn it on using an M106 command in config.g.

    How would that be different than the way M106 works today? It turns on/off at a given temperature. Isn't that all he wants? I'm planning to do exactly this same thing. I assumed this would work the same as it does with my hotend fan.

    Ian


  • administrators

    Goldentuna wanted the fan to come on when the Duet reaches a certain temperature. That bit isn't supported yet. But you could use bed and/or extruder temperature to control it.



  • I stuck a bead thermistor onto the X axis stepper driver with a dab of epoxy on the basis that the stepper drivers probably get the hottest. In fact I did one of the drivers on the Duex5 as well because I use two separate fans. Then use M106 P2 S255 I0 H2 T45 and M106 P3 S255 I0 H3 T45 to control them at 45 degC. I created a couple of dummy tools too so that I could see the temperatures on DWC i.e. M563 P99 H3 and M563 P98 H2. Works a treat.



  • @dc42:

    Goldentuna wanted the fan to come on when the Duet reaches a certain temperature. That bit isn't supported yet. But you could use bed and/or extruder temperature to control it.

    Maybe I should elaborate on my plan… I bought a Duex5 so that I could get additional temp & fan connections. The plan being that I could use those with M106 to accomplish what Goldentuna wants. So, the problem with his request is just that the Duet alone doesn't have any more temp sensor connections, right?


  • administrators

    Hi Ian

    You can do what you describe using one more thermistor input.

    As the DuetWifi reports the CPU temperature there is an aspiration to make this a temperature channel that can be used for fan control.



  • @T3P3Tony:

    Hi Ian

    You can do what you describe using one more thermistor input.

    As the DuetWifi reports the CPU temperature there is an aspiration to make this a temperature channel that can be used for fan control.

    Ah… Ok. Makes sense.


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