Subject:
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Re: NXT "remotes"
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Newsgroups:
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lugnet.org.us.laflrc
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Date:
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Mon, 31 Jul 2006 14:30:08 GMT
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Viewed:
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1775 times
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On Mon, July 31, 2006 9:05 am, John Brost wrote:
> actually managed to get it to work rather quickly. I was amazed at how easy it
> was to create a receiver and transmitter program. But I've got a few questions
> for those of you who've done this sort of thing before.
>
> 1. A "dead" spot in the center. As it stands now, it is very tough to get the
> transmitter back to "0" so the motors on the receiver NXT actually stop. Is
> there an easy way to create a larger "stop" zone?
I have mine set so if the reading is between -10 to +10, it stops. So, if the
reading is <-10, go backwards, else if the reading is >+10 go forwards, else stop.
> 2. This may be related to #1... I think I remember at HoB how at least one
> remote was auto-centering. How was that done? Is it just a matter of
> continuously driving the levers back to 0 degrees at a low power setting?
This is a bit tricky. And, a bit of trickery.
The program is very simple. The first command was: move motor A zero degrees,
followed by B & C. Then, it went into the loop of transmitting the values from A, B
& C. As long as the program is running, it uses full power to hold the motors in
position.
The remote I've been using is actually a very early prototype NXT. That matters
because the original motors were not very powerful (unlike the production motors).
So, if you do this with a production NXT, it will drive the motors hard enough that
you can't move them.
What? You say I should just turn down the power on the motor? Sure, that sounds
good, however, I don't think it works. The problem is that once the motors reach
their desired location (at low power), they get full power to maintain that
position.
I think you need to do the same type of thing that needs to be done for the
receiver. So, if the Joystick rotation sensor is <-10, drive forward some distance.
If it's >10, drive backward. Otherwise, coast.
Steve
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Message has 1 Reply:
 | | Re: NXT "remotes"
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| (...) Thanks (and thanks to Bryan who replied off-lugnet) I had forgotten the bit about those motors being pre-prototypes. When I find time, I'll take a look at trying to figure out what to do with the more powerful ones. At the very least if I can (...) (18 years ago, 31-Jul-06, to lugnet.org.us.laflrc)
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Message is in Reply To:
| | NXT "remotes"
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| Things have been way too quiet on here for a long time now... Since I know I won't be getting much LEGO playing time at home anytime soon, and since I was headed out of town this past weekend, I took a page from Dave K's book and took my LEGO with (...) (18 years ago, 31-Jul-06, to lugnet.org.us.laflrc)
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