 | | Robolab - lejOS communication
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Hi all, we are working on our final thesis using lego mindstorms. Our goal is to implement a neural network using the backpropagation algorithm. This neural network will then be used with a webcam for pattern recognition and classification. The (...) (23 years ago, 28-Nov-02, to lugnet.robotics.rcx, lugnet.robotics, lugnet.robotics.rcx.java, lugnet.robotics.rcx.robolab)
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| | Re: Line following algorithms
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(...) Cool, this book is now high on my wish list. (...) I think that developing a good working solution that drives the robot both fast and precisely over the track, and still uses only 1 light sensor would be the ideal solution. I´m still (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
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| | Re: Line following algorithms
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(...) I guess that an improvement can be: If the sensor is on track for more than an specified time, the bot can seek at first at the opposite site as he found it the last time. Of course, it will not be bullet proof, but it may work, I´ll give it a (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
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| | Re: Newbie has an idea - Nascar style racing?
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(...) Yes, I think our team would enjoy that, also. And I would like to use the same table. Please tell me what you find out Steve (23 years ago, 27-Nov-02, to lugnet.robotics)
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| | Re: Newbie has an idea - Nascar style racing?
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(...) of the 4'x8' table I already have. I'm thinking this would be a great off-season (off the First Lego League season) activity for my FLL team and perhaps other nearby. I've sent an email to someone at FIRST to see if they have a contact at 3M (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
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| | Re: RCX and batteries
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(...) Yes, it has a bridge rectifier, I use the 10V AC supply that comes with the LEGO train controllers. ROSCO (23 years ago, 27-Nov-02, to lugnet.robotics)
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| | Re: Newbie has an idea - Nascar style racing?
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(...) Acroname has a line following mat, which I believe is made of the same material. It costs $65. (US) I didn't see the dimensions. (URL) (23 years ago, 27-Nov-02, to lugnet.robotics)
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| | Re: problem building gcc for brickOS-02.6.09 installation under windows xp
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Hello John, thanks for your help. I have found the link and I will reinstall cygwin. Since I am a 'beginner' here, are there any guidelines for me how to work with the prebuild binaries? As I say, I have no unix experiences and would need to know (...) (23 years ago, 27-Nov-02, to lugnet.robotics.rcx.legos)
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| | Re: problem building gcc for brickOS-02.6.09 installation under windows xp
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(...) Your cygwin installation is not working correctly. You shouldn't be experiencing any instabality as a result of running cygwin & unix commands. I would uninstall cygwin and try reinstalling it. And then I would not try to build the gcc cross (...) (23 years ago, 27-Nov-02, to lugnet.robotics.rcx.legos)
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| | Cygwin under Virtual PC on OS X
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Having no luck getting BrickOS and the cross compiler package to build under Mac OS X 10.2.2, I thought I'd try moving my previously working djgpp directories and LegOS 0.2.4 directories to a Virtual PC DOS session...only to remember that djgpp (...) (23 years ago, 27-Nov-02, to lugnet.robotics.rcx.legos)
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| | Re: Newbie has an idea - Nascar style racing?
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(...) The FLL mats have a different material on the back, and I doubt you could actually print on the front. That type of mat would be great for this, but I'll bet it's expensive. Steve (23 years ago, 27-Nov-02, to lugnet.robotics)
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| | RE: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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Hi Dan, (...) ok, I think that now everyone knows that I like hovercrafts... never had one... but then, I always liked helicopters and never had one also. hmmm... I just remembered I have a cpu cooling fan laying around... maybe... well, it's (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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There was an excellent episode of JunkYard Wars where they demonstrated just how easy, relatively speaking, it is to build a hovercraft. (URL) Now piloting it once it's built, there's the tricky part... Dan Novy Technical Supervisor Flash Film (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
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| | Re: Newbie has an idea - Nascar style racing?
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(...) First Lego League uses a plastic mat made by 3M for their competitions. Every team gets one to practice with when they register. I don't know how expensive it is since 3M donates it to FLL, but it does have several redeeming qualities for this (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
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| | Re: problem building gcc for brickOS-02.6.09 installation under windows xp
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(...) Don't try to build it yourself in Windows - you'll go insane. Download the prebuilt binaries. (23 years ago, 27-Nov-02, to lugnet.robotics.rcx.legos)
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| | problem building gcc for brickOS-02.6.09 installation under windows xp
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I am trying to install brickOS-02.6.09 under Windows XP using the latest instructions (version 1.2, 19.09.02). When building the gcc compiler I get the attached errors. Afterwards I notice that I constantly get 'permission denied' when I type any (...) (23 years ago, 27-Nov-02, to lugnet.robotics.rcx.legos)
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| | Re: compass sensor
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(...) Why do you need the accuracy? Dead reckoning type navigation? Just curious. (23 years ago, 26-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) Hi, I'm not sure whether this would work or not but one possibility is using an inner tube from a mountain bike tyre. They are strong, reasonably light and look to be just the right size. Also small holes could be made on the inside of the (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
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| | Re: Polling sensor values with wait_event
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Hi Joe, Thanks for your reply, I guess that is the solution to use in this case. I'll still just get values every 20ms. By changing the timeslice I could have this go a bit faster though. Thomas (23 years ago, 27-Nov-02, to lugnet.robotics.rcx.legos)
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| | Re: Line following algorithms
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(...) Have a variable remembering if the 'bot found the line turning left or right and try that direction first instead of random. This way the bot will go much fast through long turns but will always seek wrong direction for the first correction of (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
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