Subject:
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RE: Laser Pointers and IR Range finding
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 14 Jan 1999 23:25:31 GMT
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Original-From:
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Schott, Wayne W (MED) <wayne.schott@amermsx.medNOSPAM.ge.com>
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Viewed:
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1204 times
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On a similar train of thought, has anyone tried to put a red filter in
front of the light sensor to get less interference from the ambient
light? Increasing the signal to noise ratio.
If filters and penlights both work, combating robots could use different
colors without interfering with each other's RADAR. Sort of like the
different frequencies used in the radio control world.
Wayne W. Schott
Wayne.Schott@med.ge.com
----------
From: Tim McSweeney[SMTP:tim@ams.co.nz]
Sent: Thursday, January 14, 1999 4:46 PM
To: lego-robotics@crynwr.com
Subject: RE: Laser Pointers and IR Range finding
Yeah I Agree The IR is more mysterious. I was originally thinking just
how
cool it would be to have this little red dot that the Bot used for range
finding.
Thinking more about the problem of IR in a hostile environment I
realised
you can do something else to tell if there is a hostile IR source near
you.
By always listening to the Light sensor and toggling the IR port in some
complex pattern the Light sensor peaks should track the port, if there
are
extra peaks then you know someone else is nearby. This might be a job
for
LEGos.
Of course if someone is just sitting there perpetually emitting IR
Messages
they might well swamp your reflected signal entirely.
Tim
> -----Original Message-----
> From: Schott, Wayne W (MED) [mailto:Wayne.Schott@amermsx.med.ge.com]
> Sent: Friday, January 15, 1999 10:58 AM
> To: lego-robotics@crynwr.com; 'tim@ams.co.nz'
> Subject: RE: Laser Pointers
>
>
>
> Just a thought, I haven't tried it but a small focused beam penlight
> might perform better. I like the IR better because it's not
> obvious to
> the uninformed just what is going on.
>
> I'm going to try moving the light sensor about to scan for objects.
>
> Wayne W. Schott
> Wayne.Schott@med.ge.com
>
>
>
> ----------
> From: Tim McSweeney[SMTP:tim@ams.co.nz]
> Sent: Thursday, January 14, 1999 2:59 PM
> To: lego-robotics@crynwr.com
> Subject: Laser Pointers
>
> I can't try this because I don't have a pointer, and I don't
> particularly
> want to use a non-lego solution but....
>
> if you mount one of those little keychain laser pointer on top of you
> bot
> pointing forwards can the light sensor detect the spot in a dark room?
> I
> would suspect not, but It'd be interesting to try.
>
> Even if it's only to a range of about a foot it might be worthwhile.
>
> If the brightness does give you some idea of range the fact that it is
> so
> directional would mean you could scan it around to get an
> idea of where
> obstacles lie.
>
> Cheers
> Tim
>
>
>
> --------------------------------------------------------------
> ---------
> int main(int _,int __){int
> i[3]={0xFE101010,0xFE1010FE,0xFE929282};if(_
> ==1)for(_=0,__=0;(__<4);_=(_+1>=24)?++__+0*putchar('\n'):_+1){putchar(
> main(_+2,__)?(main(_+2,__+1)?' ':'_'):'
> ');main(_+2,__)&&!main(_+3,__)?
> putchar('/')+0x0*_++:0;}else
> return((_>=26)||(__>=4))?0:i[(_-2)/8]>>(3-
> __)*8>>(_-2)%8&0x1;}
> --------------------------------------------------------------
> ---------
>
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
>
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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