Subject:
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Re: temperature sensor problem
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Mon, 3 Jul 2000 19:53:07 GMT
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Viewed:
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1724 times
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ahhh... there it is. page 312. thanks. :) i think i saw that 3-digit stuff
before and i forgot about it.
and thanks for the idea about the until.
-ben
In lugnet.robotics.rcx.nqc, Dave Baum writes:
> Ben,
>
> Internally, the RCX only works with integers, but .1 degree resolution was
> desired for temperature sensors, so the sensor values are actually measured in
> .1 degree increments. A reading of 70 degrees F is stored as 700, not 70. If
> you change the value in the 'if' statement to 700 things should start working.
>
> An aside - your program repeatedly calls On() or Off() even when no state
> change is required. Its really a matter of style (and efficiency), but I
> prefer to only call functions such as On() or Off() when a state has changed.
> You could do something like:
>
> #define CUTOFF 700
>
> while(true)
> {
> // off state...wait until too hot, then turn on
> until(SENSOR_1 >= CUTOFF);
> On(OUT_A + OUT_C);
>
> // on state...wait until too cold, then turn off
> until(SENSOR_1 < CUTOFF);
> Off(OUT_A + OUT_C);
> }
>
> It turns out that these until loops are much tighter than the while/if/On/Off
> loop you wrote, so the response time would be faster. Not really a big deal
> considering the slowness of the temp sensor. As I said, its mostly a matter • of
> style.
>
> Also, you can take the SetSensorMode() back out. The call to SetSensor() will
> set both the type and mode correctly.
>
> Dave
>
> In lugnet.robotics.rcx.nqc, Ben Erwin writes:
> >
> > It's probably something simple and i'm about to embarrass myself, but
> > I'm trying to write the equivalent of an RCX Code temperature sensor watcher
> > with NQC. The motors don't seem to shut off, even when the temperature gets
> > less than 70... (I added the SetSensorMode in after it didn't work the first
> > time)
> >
> > -Ben
> >
> > // BubbleTemp
> >
> > task main()
> > {
> > SetSensor(SENSOR_1, SENSOR_FAHRENHEIT);
> > SetSensorMode(SENSOR_1, SENSOR_MODE_FAHRENHEIT);
> >
> > while(true)
> > {
> > if (SENSOR_1 < 70)
> > {
> > Off(OUT_A + OUT_C);
> > }
> > else
> > {
> > On(OUT_A + OUT_C);
> >
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Message has 1 Reply:
 | | Re: temperature sensor problem
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| (...) No problem. Most of the other environments hide this sort of thing programmer, but this relies on the fact that the programming environment knows how each sensor is going to be used. I didn't think this fit with the C philosophy*, so (...) (24 years ago, 4-Jul-00, to lugnet.robotics.rcx.nqc)
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Message is in Reply To:
| | Re: temperature sensor problem
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| Ben, Internally, the RCX only works with integers, but .1 degree resolution was desired for temperature sensors, so the sensor values are actually measured in .1 degree increments. A reading of 70 degrees F is stored as 700, not 70. If you change (...) (24 years ago, 3-Jul-00, to lugnet.robotics.rcx.nqc)
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