Subject:
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Teaching Bluetooth and Protocols
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Wed, 11 Jul 2007 19:18:50 GMT
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Viewed:
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20451 times
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I've reached a goal this summer. Last week, 5 kids got into Bluetooth and made
simple remote controls. I provided two simple NXT-G programs, BTSend on the
Master NXT Remote Control and BTRecv on the Robot Slave.
BTSend uses the left and right NXT buttons to increment/decrement Number1
inclusively between 0 and 4. It also displays the number and plays a
corresponding tone. Pressing the Enter button sends the numeric message.
BTRecv takes the numeric message and feeds a flat Switch. It's up to the kids
to define what each value does. Some used 2 to stop, some used 0. They also
assigned forward, reverse and left/right turns to chosen message values.
This was meant to be a lesson on creating a "language", which they learned very
quickly. It then became a hodge podge lesson on communication protocol.
Setting up a proper Master-Slave relationship was often confused by the attempt
to get a connection. If attempts using the Master RC to establish a connection
with the Robot Slave seemed futile, the kids would try getting a connection from
the Slave to the Master. That confusion was easily resolved by Rule 1: "Use the
Master to connect to the Slave."
At some point, only 5 sets of Master-Slaves could operate at any one time.
Additional attempts to establish additional connections failed.
Question: How can I get around the seeming 5 set limit? Or is there really such
a limit?
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Message has 1 Reply:
 | | Re: Teaching Bluetooth and Protocols
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| (...) ... (...) Just to be clear, you got 5 pairs of master/slave NXTs to communicate as pairs? But if you added a 6th pair, then those two could not connect to each other? That's really strange... Ralph (17 years ago, 11-Jul-07, to lugnet.robotics.nxt)
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Active threads in NXT programmable brick
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