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Re: Video: What is a PID Controller?

From Tim Wescott <seemywebsite@myfooter.really>
Subject Re: Video: What is a PID Controller?
Newsgroups comp.dsp
References <-LadnXcXB42A87fKnZ2dnUU7-R-dnZ2d@giganews.com> <df0fd0f8-9169-4374-88bd-c92b1779a635@googlegroups.com>
Message-ID <-LadnXAXB40vFrfKnZ2dnUU7-R-dnZ2d@giganews.com> (permalink)
Date 2016-05-04 18:54 -0500

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On Wed, 04 May 2016 16:51:30 -0700, robert bristow-johnson wrote:

> On Wednesday, May 4, 2016 at 5:48:17 PM UTC-4, Tim Wescott wrote:
>> Just posted a video.  It's my first real effort and, as videos go,
>> rough as a cob -- but I think the information is solid.
>> 
>> I have a 15-minute time limit -- trying to fit an informative video
>> into that is kind of like explaining General Relativity with a book of
>> haiku.
>> 
>> https://www.youtube.com/watch?v=2elEXcv0AV8
> 
> why does the fan trainer arm stand straight up when the controller is
> *not* on?  why doesn't it fall?  like at frame 220, it is pulled back
> from what looks like it's a hard stop, but it doesn't drop to the hard
> stop.
> 
> is it just the friction forces on the drive train (angle sensor or motor
> if there is one besides the fan)?

It's balanced, and has a little bit of friction.  Mostly it's well 
balanced.

Achieving both, in a mechanism that I could produce cheaply in quantity, 
was an interesting challenge.

Good question.

-- 

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

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Thread

Video: What is a PID Controller? Tim Wescott <seemywebsite@myfooter.really> - 2016-05-04 16:48 -0500
  Re: Video: What is a PID Controller? eric.jacobsen@ieee.org (Eric Jacobsen) - 2016-05-04 21:58 +0000
  Re: Video: What is a PID Controller? Les Cargill <lcargill99@comcast.com> - 2016-05-04 18:30 -0500
  Re: Video: What is a PID Controller? Martin Riddle <martin_ridd@verizon.net> - 2016-05-04 19:43 -0400
    Re: Video: What is a PID Controller? Tim Wescott <seemywebsite@myfooter.really> - 2016-05-04 18:57 -0500
      Re: Video: What is a PID Controller? Clifford Heath <no.spam@please.net> - 2016-05-05 09:07 +1000
        Re: Video: What is a PID Controller? Tim Wescott <seemywebsite@myfooter.really> - 2016-05-04 19:52 -0500
          Re: Video: What is a PID Controller? Tim Wescott <seemywebsite@myfooter.really> - 2016-05-04 20:08 -0500
  Re: Video: What is a PID Controller? robert bristow-johnson <rbj@audioimagination.com> - 2016-05-04 16:51 -0700
    Re: Video: What is a PID Controller? Tim Wescott <seemywebsite@myfooter.really> - 2016-05-04 18:54 -0500
  Re: Video: What is a PID Controller? Randy Yates <yates@digitalsignallabs.com> - 2016-05-04 23:44 -0400
  Re: Video: What is a PID Controller? Jeff Liebermann <jeffl@cruzio.com> - 2016-05-04 23:21 -0700
    Re: Video: What is a PID Controller? Tim Wescott <tim@seemywebsite.com> - 2016-05-05 01:49 -0500
      Re: Video: What is a PID Controller? Jeff Liebermann <jeffl@cruzio.com> - 2016-05-05 00:58 -0700
        Re: Video: What is a PID Controller? Jeff Liebermann <jeffl@cruzio.com> - 2016-05-05 18:14 -0700
  Re: Video: What is a PID Controller? Bob Penoyer <bob@NOSPAMbobpenoyer.com> - 2016-05-05 10:07 -0700
  Re: Video: What is a PID Controller? OG <freenews@freenewsspam.net> - 2016-05-05 11:01 -0700
  Re: Video: What is a PID Controller? Baron <baron@linuxmaniac.net> - 2016-05-05 20:55 +0100
  Re: Video: What is a PID Controller? eric.jacobsen@ieee.org (Eric Jacobsen) - 2016-05-05 20:37 +0000
  Re: Video: What is a PID Controller? piglet <erichpwagner@hotmail.com> - 2016-05-06 11:02 +0100
    Re: Video: What is a PID Controller? Randy Yates <yates@digitalsignallabs.com> - 2016-05-06 12:21 -0400
    Re: Video: What is a PID Controller? Tim Wescott <seemywebsite@myfooter.really> - 2016-05-06 12:52 -0500
  Re: Video: What is a PID Controller? Steve Underwood <steveu@dis.org> - 2016-05-06 22:45 +0800
    Re: Video: What is a PID Controller? makolber@yahoo.com - 2016-05-06 08:13 -0700
      Re: Video: What is a PID Controller? Tim Wescott <seemywebsite@myfooter.really> - 2016-05-06 12:52 -0500
  Re: Video: What is a PID Controller? gyansorova@gmail.com - 2016-05-06 14:09 -0700
    Re: Video: What is a PID Controller? Tim Wescott <seemywebsite@myfooter.really> - 2016-05-06 18:11 -0500
      Re: Video: What is a PID Controller? gyansorova@gmail.com - 2016-05-08 11:46 -0700
        Re: Video: What is a PID Controller? Tim Wescott <tim@seemywebsite.com> - 2016-05-08 15:20 -0500
  Re: Video: What is a PID Controller? ChesterW <iamsnoozin@yahoo.com> - 2016-05-06 20:51 -0500

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