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 14:32:56 GMT
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Viewed:
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1426 times
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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
>
> -----------------------------------------------------------------------
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Message has 1 Reply:
 | | 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 (...) (24 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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| (...) 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 (...) (24 years ago, 24-Jul-00, to lugnet.robotics.rcx.legos)
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