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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 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 2 Replies:
 | | Re: hexipod walker
|
| Have a look a (URL) is my hobby robotics site. Currently I have a Hexwalker running with a HB. The 12 servo's are simply controller by a PIC 16F84. This PIC is controlled by the HB through an async interface. This makes it lightweight on the HB, so (...) (25 years ago, 4-Feb-00, to lugnet.robotics.handyboard)
| | | Re: hexipod walker
|
| 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 (...) (25 years ago, 4-Feb-00, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Re: hexipod walker
|
| 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 (...) (26 years ago, 8-Jan-99, to lugnet.robotics.handyboard)
|
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