Subject:
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Re: Resets
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sun, 24 Mar 1996 16:07:37 GMT
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Original-From:
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raest <raest@vnetSAYNOTOSPAM.net>
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Viewed:
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1963 times
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The MB design keeps ground in common, but the ground to the cpu, has an
inductor in line with it, the HB also has a inductor on the ground side,
I think.
You might want to put an inductor on both sides of the motor, with a cap
inbetween both of them...
On Sat, 23 Mar 1996, John S Seng wrote:
> If I add a separate motor power to the L293's, can I keep the ground
> lines common? If not, what pins are motor ground? (I know pins 4,5,12,
> and 13 are ground) Thanks.
>
> -John
>
>
> On Sat, 23 Mar 1996, raest wrote:
>
> > I have a few suggestions, these are all things that I have seen before to
> > help reduce noise from motors
> >
> > I think that the problem might be due to crap getting back to the power
> > line... thereby causing the DS1233 to say, time to reset...
> >
> > - try a seperate power supply for the 293 chips, this isolates them from
> > the power for the
> > - add another inductor to the power supply for the cpu, there is
> > currently one there vs 2 on the Mini Board
> > - you might add some caps across the motor terminals, this can help sock
> > up some of the noise
> > - you might also add another large cap to the power line
> >
> >
> > On Fri, 22 Mar 1996, Fred G. Martin wrote:
> >
> > > > I traced my reset problem down to the fact that there is a ton of
> > > > electrical noise in the chip power (+5V). The noise is there only when
> > > > motors are running. After a minute or so of running the motors, I'll get
> > > > a runtime error or the board will just hang. These are the same motors
> > > > that I used to run for hours. Any ideas? TIA (again...:)
> > >
> > > I can't say that I have an explanation of why the motors would work at
> > > first and then cause problems later, but I can say that:
> > >
> > > Not all motors work with the Handy Board. In particular, motors that
> > > want to draw too much current (e.g., more than 1A) will cause
> > > problems.
> > >
> > > If the L293's are getting too hot to touch when running the motors,
> > > the motors are probably going to be a problem.
> > >
> > > -Fred
> > >
> > >
> >
> >
>
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