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 16:23:14 GMT
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Original-From:
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Steve Moffat <smoffat@hcitech.+StopSpam+com>
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Viewed:
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1422 times
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Greetings,
No not yet. I have been a little Lego lazy here recently. But the
Lizards are still happy and healthy so as winter ends and I see the twinkle
of love in their eyes they should give me a reason to build it. Once built I
will take pictures and post them somewhere. Thanks for the information!
Question to the group : Has anyone sold their sole to PITSCO/dacta and
acquired any of the DCP sensors? The humidity sensor would be a great
addition to this project! I know most of you are more inclined to build your
own then buy them so has anyone built a humidity sensor?
Thanks all!
Stephen Moffat
-----Original Message-----
From: Ben Jackson [mailto:ben@ben.com]
Sent: Monday, February 07, 2000 5:35 AM
To: lego-robotics@crynwr.com
Subject: Re: Sensor Reliability
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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