Subject:
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Re: SPIRIT SetSensorMode "slope" parameter
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 9 Dec 1998 18:50:59 GMT
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Viewed:
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833 times
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Dr. Bob Miller <74471.3622@compuserve.com> wrote:
> One particular parameter of the SetSensorMode command is somewhat obscure:
> the "Slope" parameter. The Lego SDK doesn't explain this very well in my
> view, and I haven't been able to get it to do anything particularly useful
> yet. I' posting this message to see if anyone here has a good explanation
> of how this parameter is supposed to work, and how you are supposed to use
> it.
>
> The SDK says that Slope pertains to Boolean mode only. If you set
> Slope=0, Boolean mode acts in the normal way, like the Touch sensor:
> 1=(RAW<45%of1023), 0=(RAW>55%of1023). If you set Slope to a value in
> range of 1..31, the SDK implies that this value of slope is the increment
> needed to get a change in the Boolean state. I sort of expected that if
> you set Slope=10, then a change of 10 in the value of RAW would change
> Boolean from a 1 to a 0 or a 0 to a 1. However, I don't actually see
> behavior like that.
It sounds like you understand the general idea of how the slope parameter
works, although I don't think that a slope of 10 implies that the
transition happens when the raw value changes by 10. For slopes in 1..31,
I believe the raw value change required for a transition is simply
proportional to the slope, not equal to the slope.
I have yet to dig up the exact formula.
Anyways, my documentation for the slope value is at:
http://graphics.stanford.edu/~kekoa/rcx/opcodes.html#set_sensor_mode
-Kekoa
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Message is in Reply To:
 | | SPIRIT SetSensorMode "slope" parameter
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| Hi all- I've been writing an article about programming the RCX using Delphi and the SPIRIT OCX, to appear in MicroComputer Journal Magazine in my Delphi in the Laboratory series. I've written an example program, to be published with source code, (...) (26 years ago, 9-Dec-98, to lugnet.robotics)
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