Subject:
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Re: Strange problem using 2 active sensors at the same time with 0.2.4
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Wed, 15 Nov 2000 00:42:20 GMT
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Viewed:
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1225 times
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On Tue, 14 Nov 2000, Carsten Müller wrote:
> In a actual project, i'm using the following setup:
> Input:
> 1 Rotation sensor (steering)
> 2 nc
> 3 Rotation sensor (distance measuring)
>
> Output:
> A drive motor
> B nc
> C steering motor
>
> If more than one sensor is set to active, only the first (steering) one
> can be used to read 'real' values. The reading from the second
> (distance) rotation sensor are completely out of track toggling
> 'randomly' around the starting value. This behavior is independent of
> the state of the motors but is influenced by the state of the sensors
> (active || passive). A second current sink on one of the other sensor
> ports disables the formerly working one. This behavior is independent
> from the state of the batteries. I've tested it with freshly loaded NiMh
> and with nearly empty NiCd (not with normal batteries) and also with two
> other RCX's.
>
> If i use legOS-0.2.3 from http://www.noga.de/legOS/legOS-0.2.3.tar.gz
> with dsensor-new.c instead of dsensor.c everything works as expected.
>
> now my question:
> Is there a patches against 0.2.4 which solves this very strange problem
> with active sensors?
I don't have a solution, but I thought I'd throw in my experiences. I
curently have a robot that uses two rotation sensors, and I've never had
trouble with them under either 0.2.3 or 0.2.4. I looked through your code
briefly and couldn't find anything obviously wrong. You do a
ds_rotation_set() before a ds_rotation_on(), and mine are in the opposite
order, but I don't think that would really cause the problems that you
describe. You might try switching them around, but don't expect results.
Otherwise everything seemed fine, but I didn't have time for a thorough
examination. Given my experiences I would expect it to be something
strange in your code that was ok under 0.2.3 but that broke under 0.2.4
rather than an actual problem with the OS.
--
"Say not, 'I have found the truth,' but rather, 'I have found a truth.'
"Say not, 'I have found the path of the soul.' Say rather, 'I have met the
soul walking upon my path.'" -- Khalil Gibran
Mike Ash - <http://www.mikeash.com/>, <mailto:mail@mikeash.com>
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