Subject:
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Re: NXT Robot Swarm at BrickFest -- featuring Bluetooth
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Sun, 13 Aug 2006 02:46:02 GMT
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Viewed:
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20482 times
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On Fri, August 11, 2006 7:17 pm, Tony Buser wrote:
> On 8/11/06, Brian Davis <brdavis@iusb.edu> wrote:
> > The problem (I think; somebody want to prove me wrong?) is that the "master"
> > NXT can send messages to at most three "slave" NXTs, but the "slaves" can not
> > then act as BT masters to still more units. In other words, it seems very very
>
> On the NXT screen under bluetooth connections, it showed my
> laptop on both Connection 0 and Connection 1.
>
> I haven't tried to actually communicate on both connections at the
> same time yet and I only have one NXT so perhaps it wouldn't work
> between NXTs, but it seems to be possible for the NXT to act as both a
> master and slave when connecting to other bluetooth devices... I'll
> experiment with it some more this weekend.
I played around with this a little bit, trying to confirm what I've been told. It
is possible to have an NXT connect as either a master or a slave, but not both at
the same time. I'm sure this is true.
Here's what I did: I took three NXTs with the latest firmware.
(A) Master to B
(B) Slave to A and Master to C
(C) Slave to B
When you connect two NXTs, the < in the top left corner becomes a diamond (like <>).
Connecting A to B, both show they are connected.
Then, connecting B to C, A no longer shows that it's connected.
Then, connecting A to B, all three show they are connected, and B shows (from the
connections screen) that it's connected to both A and C.
However, when I ran a program to send messages from A to B, and B to C, the message
did not go from A to B. And, looking at the Connections on B, it only shows the
connection to C.
Bottom line: An NXT can be either a master or a slave, but not both, at the same time.
Steve
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