Subject:
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Re: Sensor Reliability
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 7 Feb 2000 10:34:32 GMT
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Viewed:
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1492 times
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In lugnet.robotics, Dave Baum writes:
[regarding the accuracy of the LEGO temperature sensor]
> Not very accurate - perhaps within 2 or 3 degrees F. The display uses 0.1
> degrees precision (either C or F), but the accuracy just isn't there.
My recent experience with the rotation sensor led me to two conclusions: the
RAW values measured by the RCX are significantly affected by both battery
voltage and the length of the connecting wire.
I suspect that the *precision* (repeatability) of the inputs is very high as
long as you control both of those variables. If you need accurate absolute
temperature readings you'll need to calibrate with any extension wires you plan
to use and use the RCX on an A/C power supply. It's possible (even likely)
that the default calibration assumes a temperature sensor with no extension
wires (since it has one built in) and a wall power supply.
BTW, was the incubator monitor that Steve Moffat was talking about ever built?
--Ben
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Message has 1 Reply:
 | | Re: Sensor Reliability
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| (...) plan (...) The reading is affected by wire length, because this introduces more capacitance in the equation. When the RCX switches off power, and takes a reading from the sensor, there is only a tiny period of time for the signal to stabilise (...) (25 years ago, 7-Feb-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: Sensor Reliability
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| Not very accurate - perhaps within 2 or 3 degrees F. The display uses 0.1 degrees precision (either C or F), but the accuracy just isn't there. I've done a little experimentation, but nothing too rigorous. No problems so far. The calibration curve (...) (25 years ago, 13-Jul-99, to lugnet.robotics)
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