Help - a NXT data-wire problem
I am not an expert programmer so this solution may be clunky. I
also do not have a robot with which to test the solution. But here's
You can use a LOGIC data wire to send information from the top
(B-motor) beam of the program to the lower (AC-move) beam.
1. Use a Variable block to write variable Logic1 to FALSE.
2. Motor block starts motor B turning 16 rotations; wait for
3. Use a Variable block to write Logic1 to TRUE.
4. Use a Variable block to read Logic1; connect wire to Loop
1. Move block starts motors A and C turning indefinitely.
2. Empty Loop with Control set to Logic "until True".
Connect data wire from top branch to this data plug.
3. Move block stops motors A and C.
If this works as intended, then the A and C motors will turn
indefinitely so long as the program is stuck in the empty loop. When
the B motor completes its 16 rotations, Logic1 becomes TRUE,
triggering the program to exit the loop and then stop motors A and
I can send a screenshot of my test program if you're interested.
I'd be interested in anyone's ideas on how to do this more
(Note: At least on the Mac, bugs in the NXT v1.1 interface
make it a royal pain in the tush to work with multiple sequence beams.
It is easy to end up with little bits of errant beam or bits of wire
floating around on the screen. It's also easy to have blocks appear to
be on the beam but actually not. I don't know if these issues plague
PC users, and if they persist in NXT v2.0.)
I have a
NXT-G programming problem that I cannot figure out. I decide to post
the three NXT block output ports A/B/C with three motors respectively.
What I have done is -
1 - Use a
MOVE block to control Motor A and C; put motor B on a MOTOR block, and
running the two blocks simultaneously. The purpose of doing so is
while all three motors are running at the same time, I can have the
option to set the power level on A and C differently from B's. I
successfully programmed that using "branch-out" sequence beam as
Charlie described in an early email.
2 - I know
when I want B to stop: after 16 rotations. I want A and C to stop when
B stops. The duration values (time, degree or rotation) on MOVE
block for A and C cannot provide an satisfactory result.
Here is my
challenge: I wonder the data wire may give me what I need, but I
don't know much about it. I have read the online help and I'm still
clueless - all wiring I tried got grayed out :-((
suggestions are really appreciated!
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