Newsgroups: comp.robotics
Path: brunix!sgiblab!news.cs.indiana.edu!noose.ecn.purdue.edu!nettle.ecn.purdue.edu!laird
From: laird@nettle.ecn.purdue.edu (Kyler Laird)
Subject: Re: PWM DC motor control
Message-ID: <laird.764438838@nettle.ecn.purdue.edu>
Sender: news@noose.ecn.purdue.edu (USENET news)
Organization: Purdue University Engineering Computer Network
References: <PJG.94Mar21134448@parint.esl.com> <H5RLJc1w165w@sfrsa.com>
Date: Wed, 23 Mar 1994 16:07:18 GMT
Lines: 17

Slightly off the subject, but...

Is lock-up detection "easy" with an H-bridge controlling a (not
necessarily PWM) DC motor given an unstable power supply?  I saw
a chip from Motorola that seems to have this ability, but I'm
concerned with supply voltage changes and voltage drops to the
motor.

What I'm looking for is a way to control my car door windows.  I
want to know when they stop, though - and I'd prefer not to use
an optical encoder.  (I'd have a heck of a time putting one on
the sunroof motor.)  I also can't afford a big voltage drop
across a sensing resistor in series with the motor.

Thanks!

--kyler
