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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Thu, 4 May 2006 02:55:36 GMT
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Viewed:
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7096 times
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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
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 in mind, has anyone
experimented with creating a remote using a computer peripheral (such as a
gamepad/joystick/mouse connected to a Bluetooth enabled PC) ?
What Bluetooth profiles does the NXT implement? For example one standard
profile is Human Interface Device (HID). It’d be interesting to create a
computer interface out of LEGO for my laptop, such as a NXT mouse or keyboard.
Or something like a NXT barcode scanner that types the number on a PC via a HID
interface (there are some commercial barcode scanners that work that way).
-Tim
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Message has 1 Reply:
 | | Re: NXT to NXT communication?
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| (...) Yes, that's a tough one... (...) I've played around with a few ideas using bluetooth. In addition to the NXT->NXT remote, I wrote a program for my Bluetooth enabled PDA using eVB. Jim Kelly actually has a screenshot in his blog (URL) under (...) (20 years ago, 4-May-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: NXT to NXT communication?
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| (...) 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 (...) (20 years ago, 3-May-06, to lugnet.robotics)
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