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In lugnet.robotics.handyboard, Gary Livick writes:
> It's just an ordinary motor after you modify it to take out the feedback device,
> and you have no idea of where it is pointing at any time. Maybe you could have
> the robot turn in a circle to find the beacon? Or use a small stepper motor? You
> can drive a bipolar stepper right off one of the L293D motor ports. If you don't
> like either of those ideas, how about mounting two servo motors, one on top of the
> other, with your sensors on top of the two. That way you can get nearly 360° of
> rotation.
>
> Good luck!
>
> Gary Livick
>
> raju kammela wrote:
>
> > Hi,
> > I am trying to implement a auto recharge system for my robot. i am using a
> > homming beacon on the recharging station and whenever myrobot is out of charge
> > it has to find the that beacon. to scan the area i need to use the sero motor.
> > i never used a servo motor for continuous rotation. and i never opened one to
> > see the pot arrangement. so my question is if we modify the servo for continous
> > rotation is it still going work as a sero or then it's just a ordanary motor.
> > all i need is to get 360 deg of rotation for my scan. i am waiting for this
> > part of my design to complete. please help with this question.
> >
> > thanks in advance.
> >
> > raj
Hi all,
why so complicated ?
Use a pair of gears to double the turn ability.
We had the same problem (to find a beacon) and succesfully build it.
I guess you don't have to be 1 degree accurate, or ?? I think 2 degrees will
work. (You don't have time to look on every degree.)
I have another good hint for you.
Use three beacon sensors to find the beacon.
The middle sharp focused the other two with a wider range to find it left or
right.
If you're interested take a look at our solution
http://www.informatik.fh-hamburg.de/~lego/Projekte/bilder_roberta/roberta_hk_3.jpg
(sorry this site is available in german only, but that doesn't matter for
the photo I guess ;-) )
Rainer
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Message has 1 Reply:
 | | Re: hacking servo motors
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| Thanks guys(Rainer and Gary) for your valuble ideas. i think i will go with the Rainer's method because of the simpicity(only one motor). any way i designed my sensor module for beacon finding long back with three sensors. so now i got confidence (...) (24 years ago, 1-Feb-01, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Re: hacking servo motors
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| It's just an ordinary motor after you modify it to take out the feedback device, and you have no idea of where it is pointing at any time. Maybe you could have the robot turn in a circle to find the beacon? Or use a small stepper motor? You can (...) (24 years ago, 15-Jan-01, to lugnet.robotics.handyboard)
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