Boe-Bot Servos
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Posts: 46,084
I bought the Parallax Boe-Bot special and decided to play with it to learn a
little programming. It comes with the new updated servos. After I put it
together the RPM of the servos are not even close. I have to use a 500 pulse
time for one servo and a 820 pulse time for the other to get it to track
straight. I ended up shimming the servos so they "turn" to get it close... I
can now use 500/970 which is much better.
Is this a common problem with the new servos?
Hank Hagquist
HobbyTalk - http://www.hobbytalk.com
HobbyShopper - http://www.hobbyshopper.com
little programming. It comes with the new updated servos. After I put it
together the RPM of the servos are not even close. I have to use a 500 pulse
time for one servo and a 820 pulse time for the other to get it to track
straight. I ended up shimming the servos so they "turn" to get it close... I
can now use 500/970 which is much better.
Is this a common problem with the new servos?
Hank Hagquist
HobbyTalk - http://www.hobbytalk.com
HobbyShopper - http://www.hobbyshopper.com
Comments
you can insert a small phillips driver to set
the 'do-nothing' point -- which should be
1500 mS (or 750 on Pulsout).
2. I also bought the special. I havn't gotten
to the point of actually running it yet. Sigh.
Thus even if both are properly set to the same
'do-nothing' point, I don't know if they will
be the same speed at the same Pulsout setting.
More later, I'm sure.
--- In basicstamps@yahoogroups.com, "Hank Hagquist" <hankster@h...>
wrote:
> I bought the Parallax Boe-Bot special and decided to play with it
to learn a
> little programming. It comes with the new updated servos. After I
put it
> together the RPM of the servos are not even close. I have to use a
500 pulse
> time for one servo and a 820 pulse time for the other to get it to
track
> straight. I ended up shimming the servos so they "turn" to get it
close... I
> can now use 500/970 which is much better.
>
> Is this a common problem with the new servos?
>
> Hank Hagquist
> HobbyTalk - http://www.hobbytalk.com
> HobbyShopper - http://www.hobbyshopper.com
other. Needing a 360 ms offset just seems kind of extreme.
Hank Hagquist
HobbyTalk - http://www.hobbytalk.com
HobbyShopper - http://www.hobbyshopper.com
Original Message
From: "Allan Lane" <allan.lane@h...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, February 09, 2004 3:26 PM
Subject: [noparse][[/noparse]basicstamps] Re: Boe-Bot Servos
> 1. The new servo's have a 'tuning' port, where
> you can insert a small phillips driver to set
> the 'do-nothing' point -- which should be
> 1500 mS (or 750 on Pulsout).
>
> 2. I also bought the special. I havn't gotten
> to the point of actually running it yet. Sigh.
> Thus even if both are properly set to the same
> 'do-nothing' point, I don't know if they will
> be the same speed at the same Pulsout setting.
> More later, I'm sure.
>
> --- In basicstamps@yahoogroups.com, "Hank Hagquist" <hankster@h...>
> wrote:
> > I bought the Parallax Boe-Bot special and decided to play with it
> to learn a
> > little programming. It comes with the new updated servos. After I
> put it
> > together the RPM of the servos are not even close. I have to use a
> 500 pulse
> > time for one servo and a 820 pulse time for the other to get it to
> track
> > straight. I ended up shimming the servos so they "turn" to get it
> close... I
> > can now use 500/970 which is much better.
> >
> > Is this a common problem with the new servos?
> >
> > Hank Hagquist
> > HobbyTalk - http://www.hobbytalk.com
> > HobbyShopper - http://www.hobbyshopper.com
The servos in your kit are different from (and better than) the servos
described in the
Robotics v1.5 text. There should have been a handout in your kit with
instructions for the Parallax Continuous Rotation servos and other parts
that have been changed (and improved). Look for "Robotics Appendix J"
on www.parallax.com -> Downloads -> Educational Curriculum.
Also available from the same page is the newly revised Robotics with the
Boe-Bot v2.0 text, which supports all the new hardware and PBASIC 2.5.
Regards, Andy
Andy Lindsay
Applications Engineer
Parallax, Inc.
Original Message
From: Allan Lane [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=w0goqhm37BjcKo6I8_vwhmUS57EGrM76rZ6AvUaID5fMWPVXRl5D4WbFuraDxGezoxdEjdoEIIAljmNG8K5lqFRFhh0]allan.lane@h...[/url
Sent: Monday, February 09, 2004 12:27 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Boe-Bot Servos
1. The new servo's have a 'tuning' port, where
you can insert a small phillips driver to set
the 'do-nothing' point -- which should be
1500 mS (or 750 on Pulsout).
2. I also bought the special. I havn't gotten
to the point of actually running it yet. Sigh.
Thus even if both are properly set to the same
'do-nothing' point, I don't know if they will
be the same speed at the same Pulsout setting.
More later, I'm sure.
--- In basicstamps@yahoogroups.com, "Hank Hagquist" <hankster@h...>
wrote:
> I bought the Parallax Boe-Bot special and decided to play with it
to learn a
> little programming. It comes with the new updated servos. After I
put it
> together the RPM of the servos are not even close. I have to use a
500 pulse
> time for one servo and a 820 pulse time for the other to get it to
track
> straight. I ended up shimming the servos so they "turn" to get it
close... I
> can now use 500/970 which is much better.
>
> Is this a common problem with the new servos?
>
> Hank Hagquist
> HobbyTalk - http://www.hobbytalk.com
> HobbyShopper - http://www.hobbyshopper.com
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