Subject:
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Re: SENSOR_READ doesn't return 0
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Newsgroups:
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lugnet.robotics.rcx.pbforth
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Date:
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Tue, 13 Apr 1999 17:07:29 GMT
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Reply-To:
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robots@*stopspammers*jpsc.co.uk
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Viewed:
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1620 times
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More information:
> > > I cannot get the LIGHT? word (tracker.txt) to work, it seems never to
> > > return 0, usually 200 or 300 (hex). I am initialising using:
> > >
> > > 1 CONSTANT RawLight
> > > 1 CONSTANT RunButton
> > > 3 CONSTANT MotorStop
> >
> > You have obviously had some FORTH experience, I'll have to admit I haven't
> > fully tested the CONSTANT word...
>
> It hadn't occurred to me that ther might be something wrong with CONSTANT, but I
> think the problem was there before. Making the sensor idx a constant was one of
> the things I did to make sure that I didn't have an inconsistancy.
CONSTANT is working - easy to check by doing
RawLight .
which prints 1
> > > : BOT_INIT
> > >
> > > ." BOT_INIT" CR \
> > >
> > > RCX_INIT
> > > POWER_INIT
> > > BUTTON_INIT
> > > SENSOR_INIT
> > >
> > > RawLight SENSOR_ACTIVE
> > > 3 RawLight SENSOR_TYPE ( Light )
> > > 0 RawLight SENSOR_MODE ( Raw )
This last line is the problem, if I use a SENSOR_MODE of 80 as in TRACKER.TXT then I
get a SENSOR_READ of 0, if I use SENSOR_MODE 0 then I never get a SENSOR_READ equal
to 0.
How does 80 in TRACKER.TXT square with the documentation?
"SENSOR_MODE ( mode idx -- )
Sets the specified sensor to one of the following modes. Use your common sense when
combining different modes and types...
0x0000 Raw mode
0x2000 Boolean mode
0x4000 Edge detection - every transition counts
0x6000 Pulse detection - only negative transitions count
0x8000 Percent of scale
0xA000 Degrees Celsius
0xC000 Degrees Fahrenheit
0xE000 Angle detection"
What I am trying is to recode the IR proximity detector that has appeared a few
times, this is my current NQC initialisation:
task ProximityDriver
// converted from code by Mark R. David (markdavid@mediaone.net)
{
Sensor(RAW_LIGHT, IN_CFG(STYPE_LIGHT, SMODE_RAW));
IRMode(IR_HI);
How should I get a raw light reading?
--
John & James Cooper, Wallington, UK
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Message has 1 Reply:
 | | RE: SENSOR_READ doesn't return 0
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| (...) OOPS, that SHOULD read 0x0080 since the mode is a BYTE value. Overzealous urge to get content into the website is to blame. For the light sensor, I generally use the percent of scale mode. My website has a page on tricks with the light sensor (...) (25 years ago, 15-Apr-99, to lugnet.robotics.rcx.pbforth)
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Message is in Reply To:
| | RE: SENSOR_READ doesn't return 0
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| (...) AhA! Another victim within my clutches!!!!! Glad to hear you are trying things out, John. The more questions I get, the sooner I can get a FAQ out to help with the common ones. (...) That's a good sign, at least. (...) You have obviously had (...) (25 years ago, 13-Apr-99, to lugnet.robotics.rcx.pbforth)
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