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 19:10:15 GMT
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Viewed:
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4420 times
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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!
Did you define the sonsors correctly ?
For example :
#define BUTTON SENSOR_2
#define DETECT_LEFT SENSOR_1
#define DETECT_RIGHT SENSOR_3
#define MOTOR_LEFT OUT_A
#define MOTOR_RIGHT OUT_C
task main()
{
SetSensor(BUTTON, SENSOR_TOUCH);
SetSensor(DETECT_LEFT, SENSOR_TOUCH);
SetSensor(DETECT_RIGHT, SENSOR_TOUCH);
SetPower(MOTOR_LEFT,7);
SetPower(MOTOR_RIGHT,7);
SetDirection(MOTOR_LEFT,OUT_REV);
SetDirection(MOTOR_RIGHT,OUT_REV);
On(MOTOR_LEFT);
while(DETECT_LEFT == 0);
Off(MOTOR_LEFT);
On(MOTOR_RIGHT);
while(DETECT_RIGHT == 0);
Off(MOTOR_RIGHT);
This works fine for me in the main task (no other tasks running)
> 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?
No, you don't need to.
> 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.
I send you an example i did to your e-mail adress.
> 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 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 (...) (26 years ago, 5-Feb-01, to lugnet.robotics.rcx.nqc)
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