Subject:
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Re: How is this?
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Thu, 19 Aug 2010 14:27:12 GMT
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Viewed:
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57344 times
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In lugnet.robotics.nxt, Gus Jansson wrote:
> In lugnet.robotics.nxt, Edwin Pilobello wrote:
> > The program in NXT-G is simple:
> >
> > Loop forever
> > If Touched
> > {
> > wait for ultrasonic < 9"
> > turn MotorA forward unlimited
> > }
> > else
> > {
> > turn MotorA off
> > }
> >
> > If touched and distance > 9, MotorA does not move.
> > If touched and distance < 9 MotorA turns
> > -- If untouched and distance is < 9, MotorA stops
> > -- If untouched and distance is > 9. MotorA keeps on turning!
> >
> > The last condition is what's bugging us. Why does the motor not stop if
> > distance is greater than 9"? I have always assumed the switch block would take
> > the bottom (negative) logic when untouched. As it is now, the motor keeps
> > spinning until the ultrasonic detects < 9". Obviously, after the motor starts
> > turning, it ignores the touch sensor.
>
> I can see how this can happen and it depends on the sequence of events. This
> sequence will cause this behavior:
> touched AND distance < 9 - Motor turns on
> touched AND distance > 9 - Motor running, waiting for distance < 9
> untouched AND distance > 9 - Motor running, still waiting for distance < 9
>
> This may be a good time to introduce data wires and using the logic block to do
> a logical AND.
>
> Gus
Yes, change the "wait for 9" to be a "check for 9", and the problem should go
away...
Loop forever
if Touched and distance < 9
{
turn on motor
} else {
turn off motor
}
Kevin
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Message is in Reply To:
 | | Re: How is this?
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| (...) I can see how this can happen and it depends on the sequence of events. This sequence will cause this behavior: touched AND distance < 9 - Motor turns on touched AND distance > 9 - Motor running, waiting for distance < 9 untouched AND distance (...) (17 years ago, 23-Jan-10, to lugnet.robotics.nxt)
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