Duet3D Logo Duet3D
    • Tags
    • Documentation
    • Order
    • Register
    • Login

    Fan8 output weird stuff

    Scheduled Pinned Locked Moved Unsolved
    Duet Hardware and wiring
    2
    4
    186
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • matej1006undefined
      matej1006
      last edited by

      Hello

      i have one question is normal on Duex 5Ch board that when i set fan8 off i have on pin's 4,95V when i turn on fan i have 1.65V?

      Please help?

      1 Reply Last reply Reply Quote 0
      • owlfabundefined
        owlfab
        last edited by owlfab

        How exactly are you measuring the voltage? Across the two connector pins, or relative to ground? Is the fan connected?

        1 Reply Last reply Reply Quote 0
        • matej1006undefined
          matej1006
          last edited by

          fan is not connected i measure across two pin's and to ground

          1 Reply Last reply Reply Quote 0
          • owlfabundefined
            owlfab
            last edited by

            I'm assuming you have the jumper set to 5V?

            If you are measuring 4.95V across the pins with the fan turned off, that seems wrong.

            However, neither of the fan pins is actually tied to GND. One of the fan pins is always going to show 5V/12V/VIN relative to GND (selectable by jumber). The other one is pulled closer to GND the higher the fan speed is set.

            All that is to say, your measurements almost make sense if you are measuring the low-side pin relative to actual GND. Maybe you could just attach a fan and see if it works?

            1 Reply Last reply Reply Quote 0
            • First post
              Last post
            Unless otherwise noted, all forum content is licensed under CC-BY-SA