Subject:
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Re: hexipod walker
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 4 Feb 2000 13:26:22 GMT
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Original-From:
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Adam Oliver <oli@wantree.com.au(ihatespam)>
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Viewed:
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2017 times
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Personally I use a Scott Edwards Serial Servo Controller (model 1, there is
a new one out now) - SSC.
On the handyboard web site is a program to control this serial device from
the handyboard, which means you can just set each leg position and let the
other board do the work. CUts down on processing time and hassles. I use 2
of them daisy-chained together to control 12 servos for my hexapod walker
check out http://www.wantree.com.au/~oli for more info if u like..
hope this helps
Adam
> COOL! How do you control 8 servos? I have the expansion board and there
> are only 6 servo connections there. What other port did you use to • control
> the other 2 servo? Or do you use the expansion board at all? I am • looking
> for a way to add two more servo to my robot, instead of using to motor • with
> sensor control.
>
> --
>
> Ray
>
> Thomas Hauri <handyboard@media.mit.edu> wrote in message
> news:3695F792.7460E88E@zhwin.ch...
> Timing 12 servos with the HB could be done. So far we are using 8 servos
> which don't use much cpu resources at all. But 1 compare output can only
> time 8 servos because of the servos timing requierments without using a • lot
> of cpu time. So a second compare output must be used for the other 4 • servos.
> But using a clever algorithm timing 12 servos could be done.
> The biggest problem is to get all the contol algorithms to run for 12 • servos
> (12 axes) in realtime.
> It could be done using multiple handyboards.
>
> I'm very interested in your project, so please keep posting ideas and
> information about your WALKER.
>
>
> > I believe the best thing to do is use separte controlers (e.g. PICs) to
> > control the specific motions of the servo's. This will allow you to have
> > more control over the HB. There are several places on the web (e.g.
> > http://www.brouhaha.com/~eric/pic/ where you can find info on PIC's
> > including having them control servo's. I think the timing constraints on
> > 12 servo's will heavily tax the HB resources.
> >
> > Ronald Wijngaarde
> >
> > > ----------
> > > From: r.farnhill@bssl.co.uk[SMTP:r.farnhill@bssl.co.uk]
> > > Sent: vrijdag 8 januari 1999 11:30
> > > To: handyboard@media.mit.edu
> > > Subject: hexipod walker
> > >
> > > Hi all
> > >
> > > Iam thinking about making a six legged walking robot using servos and
> > > wondered if anybody has already built one.
> > > I want to use two servos per leg one for lifting and another for the
> > > sweeping action so giving 12 in total. One thing i want to know is how
> > > do
> > > you control twelve servos? i have seen some serial servo controllers
> > > that
> > > control upto 256, is it possible to control them with just the
> > > handyboard.
> > > also does the HB have enough proccessing power to control all these
> > > servos
> > > and still have enough spare for obstical avoidance etc.
> > >
> > >
> > >
> > > Any thoughts, tips etc.
> > >
> > > Thanks Russ....
>
>
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Message has 1 Reply:
Message is in Reply To:
 | | Re: hexipod walker
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| COOL! How do you control 8 servos? I have the expansion board and there are only 6 servo connections there. What other port did you use to control the other 2 servo? Or do you use the expansion board at all? I am looking for a way to add two more (...) (25 years ago, 4-Feb-00, to lugnet.robotics.handyboard)
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