Subject:
|
Re: NXT to NXT communication?
|
Newsgroups:
|
lugnet.robotics
|
Date:
|
Thu, 4 May 2006 01:58:00 GMT
|
Viewed:
|
3053 times
|
| |
|
|
In lugnet.robotics, Steve Hassenplug wrote:
> 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
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 improved BT protocol stack? There are many BT profiles that can be
implemented that will enable full BT functionality...
Also, since the NDA is done, how's reverse engineering going with things like
NQC for NXT?
Dave H.
|
|
Message has 2 Replies:
 | | Re: NXT to NXT communication?
|
| (...) John Barnes and others have been working on that. He has out a beta of a "Nxt Byte Code" (NBC) assembler, and he's dug into a *lot* of firmware and software details. See the following (& John's website) for more details. (URL) not as sure (...) (19 years ago, 4-May-06, to lugnet.robotics)
| | | Re: NXT to NXT communication?
|
| (...) As Brian already mentioned I have produced a compiler for a text-based language (assembly) which is called Next Byte Codes (NBC) for a number of complicated reasons. Michael Barrett Anderson, who is the father of LASM and the RCX firmware, has (...) (19 years ago, 4-May-06, to lugnet.robotics)
|
Message is in Reply To:
| | Re: NXT to NXT communication?
|
| (...) 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 (...) (19 years ago, 3-May-06, to lugnet.robotics)
|
37 Messages in This Thread:
 
 
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
This Message and its Replies on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
Active threads in Robotics
|
|
|
|
|
|
