Subject:
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Re: Increasing current output to motors on HandyBoard
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 12 Apr 1999 00:03:16 GMT
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Original-From:
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K.L.McKinnon <klmckin@magmacom&antispam&.com>
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Viewed:
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1030 times
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Actually, if you have been following this thread, there are several
ideas that have come up, including the solid state relay (reliable, high
current, but SPST, moderate cost ), transistor to up the
current(reliable, mded current, low cost, but SPST), mechanical relay
(requires driver, mod cost, multiple configurations, reliable to 10's of
thousands of cycles.)
K.L. McKinnon
Terry P. Gathright wrote:
>
> Hi,
> Anyone know where I can purchase a commercial unit that I can operate
> automobile starter type relays from the COMOS outputs on the handyboard
> expansion board? only 5 mA per output.
> Or would it be eaiser to fabricate? I don't want to damage the
> outputs.
> Thanks in advance
> Terry P. Gathright
>
> ----------
> > From: Gary Livick <glivick@pacbell.net>
> > To: MAR ERICSON <mar@cooper.edu>
> > Cc: K.L.McKinnon <klmckin@magmacom.com>; Chuck McManis
> <cmcmanis@mcmanis.com>; Ian Nieves <wired@cmu.edu>;
> handyboard@media.mit.edu
> > Subject: Re: Increasing current output to motors on HandyBoard
> > Date: Saturday, April 10, 1999 2:17 PM
> >
> > Total cost for both, $56.00. Smaller ones are cheaper. Again, the • advantage is
> > convenience, not cost. These pulg right into the motor driver output • ports on either
> > the Handy Board or the Rug Warrior with the L293D left in place, and take • no other
> > components.
> >
> > I'm doing R&D for my product line, and cost is not a criteria when I try • something.
> > However, getting 6 amps at 36 volts is pretty cheaply done this way if • someone was
> > building a bot needing this kind of power. For smaller robots, smaller • and less
> > expensive relays could be used, however given the time and knowledge it • could be done
> > for much less using H-Bridges from Allegro or some other source.
> >
> > Gary Livick
> > http://www.lightwaverobotics.com
> >
> >
> > MAR ERICSON wrote:
> >
> > > So that's like $28 for the H excluding the protecting circuitry? How • much
> > > did this setup cost for both motors?
> > >
> > > -----------
> > > ericson mar
> > > Robotics Consultant
> > > mar@cooper.edu
> > > (212)353-4356
> > >
> > > Department of Mechanical Engineering
> > > The Cooper Union for the Advancement of Science and Art
> > > -------------------------------------------------------
> > >
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