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From: gcouger@jsun.okstate.edu (Gordon Couger)
Subject: Re: PC controled robotic arm project...
Message-ID: <CxMoAp.84x@osuunx.ucc.okstate.edu>
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Reply-To: Gordon Couger <gcouger@olesun.agen.okstate.edu>=
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References: <CxLAn0.CJC@nyongwa.montreal.qc.ca>
Date: Thu, 13 Oct 1994 20:16:01 GMT
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In article <CxLAn0.CJC@nyongwa.montreal.qc.ca>,
Albert Yale <matrix@nyongwa.montreal.qc.ca> wrote:
> 
>Okay, i've been asking questions and questions, now, leme present you my
>whole project, and i'd be very gratefull if anyone sends me suggestions.
>tnx a lot!
> 
>I wana control step motors through a pc's parallel port. he's the idea...
> 
>Motor spec: 'Big Inch Motor' by HSI (?)
>            8-10vdc
>            3.6w
>            2deg/step
> 
>Pallel port spec: 5.2vdc
>                  13mA
> 
>My idea was:
> 
We have done this with optoIsolators and solid state realys or IFR123
FET and optoIsolators. 
Crydom 6301a Allide 682-0120 $12 each provides a relay that handels 3
amps and is optoisolated. It needs 5v at 15ma. I have driven this realy
with a 68HC11. 

The fet hooks up this way.

       v+------3
               3 motor winding
               3
               | source
5v--opto-gate-FET
               |
            Ground

Good luck
Gordon
                            Gordon Couger                            
                            Biosystems & Agricultural Engineering              
                            Oklahoma State University                         
                            114 Ag Hall, Stillwater, OK  74074                 
gcouger@olesun.agen.okstate.edu 405-744-9763 day 624-2855 evenings 
    I do not speak for my employer
