Subject:
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Re: NXT to NXT communication?
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 3 May 2006 17:49:32 GMT
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Viewed:
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2907 times
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In lugnet.robotics, Joe Strout wrote:
> In lugnet.robotics, Steve Hassenplug wrote:
>
> > The NXT to NXT communication works very well, and is easy to use. Here's some
> > video of an NXT controller for an NXT robot...
> >
> > http://www.brickshelf.com/gallery/Hassenplug/Robots/NXT/nxtremotecontrol.wmv
>
> Neat! You used the NXT motors as inputs on the remote control? How stiff are
> they when you do that?
The motors offer little resistance when used this way. However, there's
something else which I think is kind of cool. If you look close, when I let go
of the controller, the paddles return to the middle, and the car stops. Using
just one block at the start of the program, I set the motor to "stay there" so
when you push the paddle forward, it springs back.
The steering wheel does the same. Actually, in the latest version of my
program, when you let go of the steering wheel, the car's wheels straighten out.
The more you turn it, the more the wheels turn.
> Also, I noticed at one point you scooted the controller closer to the car. Was
> that because it had lost the signal? What is the effective range, anyway?
NO. I moved the controller so it could be seen better by the camera. The
Bluetooth spec says it will work within 10 meters. (If you really want to know,
the NXT is a Class 2 Bluetooth device)
> I also wonder what happens when you have more than two NXT bricks in the area.
> How do you sort out signals from multiple sources?
This is all done with the Bluetooth stuff. We don't need to worry about
interference, or error checking. I assume messages could be lost, but I've not
had a problem with that.
Once two NXTs are "paired" together, they can communicate back and forth, in a
noisy room. At the FLL World Festival in Atlanta, I searched for Bluetooth
devices a couple times, and found MANY in range, but never had a problem with
interference.
Brian said:
> First, all the incoming messages come in over one channel (connection [0]; connections [1], [2], and [3] are for outgoing messages),
This is not exactly true. All connections are bi-directional. You can send and
receive over each connection.
However, (almost like Brian said) Connections 1,2,&3 are outgoing connections.
That's like if this NXT originates a phone call. And, it has one incoming
connection (connection 0).
So, when you send a message, you specify the "connection" and the "mailbox" the
message is going to.
Clear as mud?
Steve
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Message has 5 Replies:
 | | Re: NXT to NXT communication?
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| (...) So they could potentially be programmed to provide force or shudder feedback? (...) Yes, but I'm interested to know: Are these multiple connections available via the LEGO retail software, or did you program your pair some other way? It's just (...) (18 years ago, 3-May-06, to lugnet.robotics)
| | | Re: NXT to NXT communication?
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| (...) Quite muddy! Why only three connections and what about specification adherence? Are they trying to limit its potential applications or were they just trying to get out a production-ready implementation? In other words are there plans for an (...) (18 years ago, 4-May-06, to lugnet.robotics)
| | | Re: NXT to NXT communication?
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| (...) Steve, your remote is pretty cool. It’s a great idea if you have more than one NXT. I checked with my purchasing manager (my wife) and I don’t think my request for capital expenditure will be approved for more than one NXT this year. With that (...) (18 years ago, 4-May-06, to lugnet.robotics)
| | | Re: NXT to NXT communication?
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| (...) Very cool- the differential is very well designed, especially using only parts from the NXT. (...) Thats what I can't figure out how to do. I made a (modded) version of Brian Davis' DAZLR and using my grandfather's NXT have made a Remote (...) (18 years ago, 15-Jul-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: NXT to NXT communication?
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| (...) they when you do that? Also, I noticed at one point you scooted the controller closer to the car. Was that because it had lost the signal? What is the effective range, anyway? I also wonder what happens when you have more than two NXT bricks (...) (18 years ago, 3-May-06, to lugnet.robotics)
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