Subject:
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Re: Q: Multitasking, and reacting to sensors
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Mon, 5 Feb 2001 19:14:08 GMT
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Viewed:
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1878 times
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Tobias, 'multi-tasking' means that several tasks run simultaneously. For
example, a robot arm could grab, lift and swivel, one after the other, as
functions, or simultaneously, as tasks. Or, the RCX could play a tune and a
walker could walk, one after the other as functions, or simultaneously as
tasks. In that case, the robot could dance :-) if you could get the timing
right. The way multi-tasking is accomplished is to start all the tasks, one
after the other, without caring when they finish. So you, in writing the
program must consider these things.
I have spent the last six months fiddling with NQC. If I had just
downloaded it and tried to work from the tutorial and manual, I think I
would have never gotten anywhere. But I bought Dave Baum's Definitive Guide
to Lego Mindstorms which is a wonderful training course. Each chapter (and
project) taught me something new. Some of these things are subtle, such as
the differences between 'if', 'while' and 'until'. Needless to say, I
enjoyed every minute of it.
Get the book!
Jerry
In lugnet.robotics.rcx.nqc, Tobias Möller writes:
> I've downloaded NQC, and got it running. I have been able to make the
> motors run, to make them run backwards, then forward, etc.
>
> However...
>
> I can't get the sensor thing to work right. I want to make a program for
> a robot that backs up and turns when it hits a wall. In RCX code I'd use
> a sensor block.
>
> In NQC, I've tried to use the "If" statement, but it doesn't work
> correctly... It doesn't react to the sensor!
>
> Does this kind of procedure need to involve multitasking to work right?
> I put the if statement inside task main{} or whatever it's called.
>
> Should I instead make one task main, where I run the motors, and one
> task bump or something, where I put the if statement?
>
> This leads me to the second question...
> Although I already may have the answer...
> Could someone give me a simple example of multitasking? I've read the
> documentation, I know what it does, I just don't know how to use it.
>
> Can I define a task in the beginning of the program, then run it only
> under certain circumstances (like light reading <50), or at a certain
> point in the program?
>
> Any help appreciated.
>
> --Tobias
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Message has 1 Reply:
 | | Re: Q: Multitasking, and reacting to sensors
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| Thanks for the replies, and for the sample programs. I'll try them out soon. I'm building a robotic arm (that's why I chose to reply to this message, not the other, later ones) that I plan to program in NQC. It does not need multitasking to work, or (...) (24 years ago, 6-Feb-01, to lugnet.robotics.rcx.nqc)
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Message is in Reply To:
| | Q: Multitasking, and reacting to sensors
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| I've downloaded NQC, and got it running. I have been able to make the motors run, to make them run backwards, then forward, etc. However... I can't get the sensor thing to work right. I want to make a program for a robot that backs up and turns when (...) (24 years ago, 5-Feb-01, to lugnet.robotics.rcx.nqc)
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