Subject:
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Re: Rotation Sensor Values
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Mon, 24 Jul 2000 19:24:16 GMT
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Viewed:
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4428 times
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On Mon, 24 Jul 2000, Andy Gombos wrote:
> I added back in the display code, and left out the lcd_refreshes. Then I got a
> proper counter. I wonder why the refresh was throwing the reading off.
That's a good question. Is this the latest tarball? If so, there have been
some modifications to the refresh loop, and this may indicate a bug in
them. In other words, it could be the double sets of lcd_refresh()
and not the actual reading that was bad. Could you post both sets of code,
so that we can take a look at them?
Luis
> In lugnet.robotics.rcx.legos, Andy Gombos writes:
> > Well, I do not know if I have to have code to display the values. I do not get
> > anything on
> > screen when I run this code. If I put a loop, and with every loop, the sensor
> > value is being displayed, then I get the values mentioned before. I run the
> > initialization steps also, and still get the bogus values.
> >
> > Andy
> > In lugnet.robotics.rcx.legos, Luis Villa writes:
> > > On Mon, 24 Jul 2000, Andy Gombos wrote:
> > >
> > > > I was reading about rotation sensors for legOS for a new robot, and
> > > > thought I'd try it out. So, I made a simple program that would show
> > > > rotation sensor values on the display. What I got was not what I
> > > > expected. I have never used the rotation sensors in legOS before, so I
> > > > do not know if this behavior was expected. Anyway, I got values of
> > > > 9999, -9999, 64, and -64 (more that once). I think that these values
> > > > correspond to the RAW values that I got from switchinf quadrants in
> > > > the sensor. Are these the expected values, or are you supposed to get
> > > > 0,1,2, -5,2, like in the regular lego firmware?
> > >
> > > Andy-
> > > Have you set up the rotation sensors correctly? You need to do a few
> > > things before you get reasonable values for the rotation sensor.
> > >
> > > 1) use ds_active(&SENSOR_1) to turn on the sensor.
> > > 2) use ds_rotation_on(&SENSOR_1) to turn on the rotation processing in the
> > > kernel.
> > > 3) use ds_rotation_set(&SENSOR_1, int X) to set the sensor to X. I believe
> > > that the default for this is undefined, so unless you use rotation set at
> > > least once, you could easily get an undefined value > 9999 or < -9999.
> > >
> > > Once you've done all that, what you should see is just a counter, noting
> > > the number of sixteenths of rotations that have occurred. (i.e., when the
> > > counter reads 16, one rotation will have occurred.)
> > >
> > > Hope that helps- please let us know if you still have problems-
> > > Luis
> > >
> > > -----------------------------------------------------------------------
> > >
> > > "Summertime... and the living is easy...
> > > fish are jumping and the cotton is high...
> > > So hush, little baby, baby don't you cry."
> > > -Ella
> > >
> > > -----------------------------------------------------------------------
>
>
-----------------------------------------------------------------------
"Summertime... and the living is easy...
fish are jumping and the cotton is high...
So hush, little baby, baby don't you cry."
-Ella
-----------------------------------------------------------------------
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Message has 1 Reply:
 | | Re: Rotation Sensor Values
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| Hee, Hee. It was 0.2.3, not 0.2.4. Here is the code snippet that setup and read the values. The current(working) code takes out the refresh, and changes the delay to msleep. ds_active(&SENSOR_2); ds_rotation_on(&SENSOR_2); (...) (26 years ago, 24-Jul-00, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | Re: Rotation Sensor Values
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| I added back in the display code, and left out the lcd_refreshes. Then I got a proper counter. I wonder why the refresh was throwing the reading off. Thanks for all your help, Andy (...) (26 years ago, 24-Jul-00, to lugnet.robotics.rcx.legos)
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