Subject:
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Re: Spurious bad readings from sensors
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Wed, 25 Feb 2004 22:29:49 GMT
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Viewed:
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4780 times
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In lugnet.robotics.rcx.legos, Kevin L. Clague wrote:
> Hi Mark,
> Thanks for the help. In Steve's legway code he reads from LIGHT_1 and LIGHT_3
> (even if there is no sensor hooked to LIGHT_3). When I was running his code
> with instrumentation for both sensors, I had nothing hooked to SENSOR_3, and I
> still got the suprious readings from SENSOR_3.
>
> It would seem the issue is not related to powering the sensor.
>
> Kevin
Could it be noise getting into the analog power supply? If you're switching
between brake and full power with the motor ports, it seems possible that some
spikes could get through to the A/D converter. You might be able to test this
by commenting out the motor drive commands and then looking at your sensor log.
If this is the case, then you'd want to try and make sure the A/D conversion
period doesn't overlap any motor commands that would cause transients.
HTH,
Mark
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Message is in Reply To:
 | | Re: Spurious bad readings from sensors
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| Hi Mark, Thanks for the help. In Steve's legway code he reads from LIGHT_1 and LIGHT_3 (even if there is no sensor hooked to LIGHT_3). When I was running his code with instrumentation for both sensors, I had nothing hooked to SENSOR_3, and I still (...) (21 years ago, 25-Feb-04, to lugnet.robotics.rcx.legos)
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