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Groups > linux.debian.user > #239225

Re: smart fans

From Gene Heskett <gheskett@shentel.net>
Newsgroups linux.debian.user
Subject Re: smart fans
Date 2021-08-23 00:20 +0200
Message-ID <CP3YR-78P-3@gated-at.bofh.it> (permalink)
References <COJ46-2g1-13@gated-at.bofh.it> <COYPw-3Mb-11@gated-at.bofh.it> <CP2T7-6tC-3@gated-at.bofh.it>
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On Sunday 22 August 2021 17:04:06 Gene Heskett wrote:

> On Sunday 22 August 2021 12:46:14 Polyna-Maude Racicot-Summerside 
wrote:
> > On 2021-08-22 10:02 a.m., Emanuel Berg wrote:
> > > tomas wrote:
> > >> I disagree. The thing poses [1] as a DC motor (2 pins power,
> > >> one tacho). I don't think you get too much control over RPM
> > >
> > > That's what you get with the 4th wire/pin? A sensor to
> > > read RPM?
> >
> > Opposite
> > 3 wire = 2 wire to drive motor + 1 wire to get speed
> > 4 wire = 2 wire to drive, 1 to get speed, 1 to modify speed
>
> I as a CET, am totally unimpressed with the miss-information being
> thrown about in this thread. A total lack of how its actually done in
> real hardware.
>
> 1. Any si diode, passing a few microamps of fwd current, is in fact an
> excellent, does not need to be calibrated, thermometer capable of 1
> degree C accuracy.  There are several million candidates buried in
> todays cpu's.
>
> 2, even a 2 wire fan can be controlled by using this voltage to
> determine the on time of a small transistor. Often down to 1% speed at
> room tmps, so other than the cost of the time at die bondout time, its
> free. The 1% minimum is actually used to help distribute the motors
> lubricant.
>
> 3, boiled down, the temp measured by this diode can be scaled to
> control the fan to maintain the device being monitored at a fixed
> maximum temp, and its done on 2 or 3 of the gates on the cpu die
> intended to be used to replace a bad gate in you cpu. Intelligently
> done at test and bondout time, it might add 10 seconds to the time
> needed to verify the rest of the chip.
>
> > > "What you can't measure, you can't control"
>
> Better, if you can measure it, you can control a 2 wite motor.
>
And I knew I couldn't get by without a typu. s/b wire.
In fact, if a motor has 3 wires, there is a good chance its a tacho wire, 
used ONLY to tell /you/ how fast its running.

> Cheers, Gene Heskett


Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>

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Thread

smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 02:00 +0200
  Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 02:50 +0200
    Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 03:10 +0200
      Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 05:00 +0200
        Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 05:10 +0200
      Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 05:10 +0200
        Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 05:30 +0200
          Re: FOSS "BIOS" (UEFI) (was: Re: smart fans) Reco <recoverym4n@enotuniq.net> - 2021-08-22 07:30 +0200
            Re: FOSS "BIOS" (UEFI) (was: Re: smart fans) Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 08:30 +0200
              Re: FOSS "BIOS" (UEFI) (was: Re: smart fans) Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 10:30 +0200
              Re: FOSS "BIOS" (UEFI) The Wanderer <wanderer@fastmail.fm> - 2021-08-22 12:10 +0200
                Re: FOSS "BIOS" (UEFI) Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 13:30 +0200
              Re: FOSS "BIOS" (UEFI) (was: Re: smart fans) Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 15:20 +0200
                Re: FOSS "BIOS" (UEFI) (was: Re: smart fans) Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 16:30 +0200
                Re: FOSS "BIOS" (UEFI) (was: Re: smart fans) Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 18:50 +0200
          FOSS "BIOS" (UEFI) (was: Re: smart fans) Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 07:30 +0200
  Re: smart fans <tomas@tuxteam.de> - 2021-08-22 09:10 +0200
    Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 09:50 +0200
      Re: smart fans <tomas@tuxteam.de> - 2021-08-22 10:00 +0200
        Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 10:10 +0200
          Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 10:10 +0200
            Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 10:20 +0200
          Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 10:30 +0200
            Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 10:50 +0200
              Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 15:10 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 16:10 +0200
                Re: smart fans The Wanderer <wanderer@fastmail.fm> - 2021-08-22 16:10 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 16:20 +0200
                Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 18:50 +0200
      Re: smart fans Hans <hans.ullrich@loop.de> - 2021-08-22 17:30 +0200
        Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 17:50 +0200
  Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-22 09:50 +0200
    Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 10:00 +0200
      Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 10:20 +0200
      Re: smart fans <tomas@tuxteam.de> - 2021-08-22 10:30 +0200
        Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 10:40 +0200
        Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 10:40 +0200
          Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 10:40 +0200
            Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 10:50 +0200
              Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 11:30 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 11:50 +0200
                Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 15:10 +0200
                Re: smart fans didier gaumet <didier.gaumet@gmail.com> - 2021-08-22 11:50 +0200
                Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 15:10 +0200
              Re: smart fans didier gaumet <didier.gaumet@gmail.com> - 2021-08-22 11:30 +0200
          Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 11:00 +0200
            Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 15:10 +0200
              Re: smart fans <tomas@tuxteam.de> - 2021-08-22 15:50 +0200
                Re: smart fans rhkramer@gmail.com - 2021-08-22 16:10 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 16:50 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 16:10 +0200
                Re: smart fans <tomas@tuxteam.de> - 2021-08-22 16:30 +0200
                Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 18:50 +0200
                Re: smart fans Gene Heskett <gheskett@shentel.net> - 2021-08-22 23:10 +0200
                Re: smart fans Gene Heskett <gheskett@shentel.net> - 2021-08-23 00:20 +0200
                Re: smart fans "Thomas Schmitt" <scdbackup@gmx.net> - 2021-08-22 16:30 +0200
                Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 18:50 +0200
                Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-22 19:00 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-22 23:10 +0200
                Re: smart fans <tomas@tuxteam.de> - 2021-08-23 10:10 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-23 21:10 +0200
                Re: smart fans <tomas@tuxteam.de> - 2021-08-23 21:10 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-23 21:30 +0200
                Re: smart fans <tomas@tuxteam.de> - 2021-08-23 21:40 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-23 22:30 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-24 00:30 +0200
            Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-22 22:30 +0200
              Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 23:20 +0200
      Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-22 21:30 +0200
        Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 22:00 +0200
          Re: smart fans didier gaumet <didier.gaumet@gmail.com> - 2021-08-22 23:20 +0200
            Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 23:40 +0200
              Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-22 23:50 +0200
                Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-23 00:40 +0200
              Re: smart fans didier gaumet <didier.gaumet@gmail.com> - 2021-08-23 09:30 +0200
        Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 22:20 +0200
          Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-22 23:10 +0200
            Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 23:30 +0200
        Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-22 23:50 +0200
          Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-23 00:10 +0200
            Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-23 02:00 +0200
              Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-23 02:10 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-23 02:40 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-23 03:00 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-23 03:30 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-23 21:00 +0200
                Re: smart fans "Andrew M.A. Cater" <amacater@einval.com> - 2021-08-24 18:20 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-24 23:00 +0200
                Re: smart fans Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-23 03:30 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-23 21:00 +0200
              Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-23 03:20 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-23 21:00 +0200
                Re: smart fans "Thomas Schmitt" <scdbackup@gmx.net> - 2021-08-23 22:50 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-23 23:00 +0200
                Re: smart fans "Thomas Schmitt" <scdbackup@gmx.net> - 2021-08-23 23:30 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-24 00:50 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-24 01:30 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-24 02:30 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-24 03:00 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-24 04:30 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-24 05:20 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-24 09:00 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-24 23:20 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-24 23:40 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-24 00:40 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-24 00:20 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-24 02:10 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-24 04:00 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-24 07:30 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-24 09:50 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-25 00:20 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-25 01:30 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-08-29 01:00 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-29 12:00 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-09-04 00:10 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-09-04 03:50 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-09-04 04:50 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-09-04 23:00 +0200
                Re: smart fans Emanuel Berg <moasenwood@zoho.eu> - 2021-09-07 03:10 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-09-07 23:20 +0200
                Re: smart fans David Christensen <dpchrist@holgerdanske.com> - 2021-08-24 11:20 +0200

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