Subject:
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Re: calculating sensor resistance (Ohm's Law)
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 8 Apr 2001 14:08:16 GMT
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Original-From:
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Pete Sevcik <(psevcik@austin.)stopspammers(rr.com)>
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Viewed:
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2052 times
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Michael,
As usual, you are correct. Thanks for pointing out my error.
- pete.
Michael Gasperi wrote:
> Pete Sevcik <lego-robotics@crynwr.com> wrote in message
> news:3ACE6E90.3FA776D0@austin.rr.com...
> > Lauren,
> >
> > Your diagrahm is correct. Your voltage assumption is not. On RCX the • full
> > scale is 2 volts to 5 volts, not 0-5 like you have assumed. Try
> > re-calculating with a 3 volt span.
>
> That is not true for passive mode. The scale is 0v = 0 and 5v = 1023 in
> passive modes like touch or temperature.
>
> The problem with what Lauren is doing is that the Temperature conversion is
> far from linear. There is a piece-wise conversion inside the RCX used to
> fit the thermistor's curve. You really need to use the raw digital values.
> There are ways to see the raw value using standard RCX code, but not ways to
> use the values in a RCX code program. If you need some more background see:
> http://www.plazaearth.com/usr/gasperi/lego.htm
--
Pete Sevcik sevcik@flash.net
Techno-stuff Robotics
http://www.flash.net/~sevcik/
Robotics for FUN !
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Message is in Reply To:
 | | Re: calculating sensor resistance (Ohm's Law)
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| Pete Sevcik <lego-robotics@crynwr.com> wrote in message news:3ACE6E90.3FA776....rr.com... (...) full (...) That is not true for passive mode. The scale is 0v = 0 and 5v = 1023 in passive modes like touch or temperature. The problem with what Lauren (...) (25 years ago, 7-Apr-01, to lugnet.robotics)
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