Subject:
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Re: proximity detection with laser?
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 8 Jan 2001 10:52:42 GMT
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Original-From:
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Marco C. <marco@soporcel.ptSPAMCAKE>
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Viewed:
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487 times
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At 21:42 05-01-2001 GMT, Hao-yang Wang wrote:
> > I intend to get a Vision Command (since I don't own a webcam) as soon as my
> > new RIS 1.0 arrives.
Just got the VC (couldn't wait for the RIS) :)
It works great on my laptop, but on my main PC (with an ATI All-in-Wonder
128) the Lego Cam and the Vision Command software doesn't work because I
think it tries to work with the first registered Capture device (ATI's
bt829) instead of the LEGO one.
If I use any other software that let's me choose the capture device, the
legocam works great, just like any other usb "webcam".
oh well... must contact lego support to see if they do some software update.
> > All the robotics stuff I've done so far was with a CyberMaster pbrick.
> > As soon as I finish my project of CM<->RCX communication, I'll start
> > working on this subject of distance measuring through vision. Be it with
> > light/laser sources, or landmark analisys... whatever works best.
> I am confused here.
> On one hand, if your robot is now tethered to the PC (for the camera),
> wireless communication is no longer important, so maybe you can switch to
> RCX completely?
> On the other hand, if you want to stick to CyberMaster, now the image goes
> from the camera to the PC, then the PC sends commands to the CyberMaster.
> Everything is fine. Why does CyberMaster need to talk to RCX?
To control a robotic arm :> (the CM "walks", the RCX "acts")
er... well, my first idea was to do everything wireless. The PC was the
main "brain" doing vision processing, and the bot was simply a "slave"
transporting the wireless cam and doing the real-world interaction. When I
saw the price of an european Xcam (PAL version) and, on top of that, the
poor image quality of it, I gave up (*for now*) the 100% wireless project :(
My two capture cards are PAL/SECAM only, so, I have no way to use the
(cheaper) NTSC Xcam version.
Then, I wanted to do a moving 'bot with an arm. That's what got me
interested in CM<->RCX comms. My idea was to make the CyberMaster the
"wheels" and wireless comms center, and the RCX the arm controller.
I wanted to maintain some sort of wireless capacity, so the CM sends VLL
compliant messages to the RCX based on what the PC sends. I use the "set
variable" because the CM doesn't work with Messages like the RCX.
Now, I have a semi-free ( VC usb cable = 5m ) bot, that can be controlled
with no IR out-of-sight problems.
...ok, it's limited to 5m range, but it's ok, for now.
Anyway, I'm still waiting for my RIS 1.0 ...I only have the CM and the VC,
so, until then, all I can do is vision-enabled rover-bot's with
spirit.ocx+Delphi.
hmmmm... I'll start looking for a LASER (don't have one) and design a Lego
solution to the line drawing by mechanically vibrating the laser... or a
small mirror.
Marco C. aka McViper
_________________________________
Work mailto:mcviper@geocities.com
Home mailto:mcviper@clix.pt
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Message is in Reply To:
 | | Re: proximity detection with laser?
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| (...) One of the things I'm intending to do is to put two light sources in the robot and measure the distance between the (if available) two reflection "points" (or er... auras) It should work better with laser source, of course. But then, using (...) (24 years ago, 5-Jan-01, to lugnet.robotics)
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