 | | Re: RFC: Creation of Version 0.2.6
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|
How about rOS or rcxOS? I think it should support USB in next relase. Zhengrong (...) (23 years ago, 12-Feb-02, to lugnet.robotics.rcx.legos)
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| | controlling different devices
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hello i am trying to control external non-standard devices with my rcx unit as a part of a science fair project. the primary control device will be a modified rotation sensor which is attatched to an old turntable. the main idea is to give an (...) (23 years ago, 11-Feb-02, to lugnet.robotics)
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| | controlling other devices
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hello i am trying to control external non-standard devices with my rcx unit as a part of a science fair project. the primary control device will be a modified rotation sensor which is attatched to an old turntable. the main idea is to give an (...) (23 years ago, 12-Feb-02, to lugnet.robotics)
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| | Re: Lost my IR Tower
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|
Mat (...) Yes but it needed a couple of transistors to invert the signal and get the voltage levels right. I wanted to fit them into the 25-pin D-connector shell but in the end, I couldn't be bothered with all the fiddly soldering and I now have a (...) (23 years ago, 12-Feb-02, to lugnet.robotics)
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| | Re: RFC: Creation of Version 0.2.6
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Or what about brOS for Brick OS? Mike (23 years ago, 11-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: RFC: Creation of Version 0.2.6
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(...) How about msOS (for MindstormsOS)? Oh, wait, we'd probably have Bill on our tails with that one... ROSCO (23 years ago, 11-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: RFC: Creation of Version 0.2.6
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|
It is a shame that the name legOS can not be kept. I think it describes the software perfectly. And if it can't be used in the future (which I suggest some begging and pleading here) I would have a name that has OS in it to best describe it. For (...) (23 years ago, 11-Feb-02, to lugnet.robotics.rcx.legos)
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| | Pics
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Hi all, I've just created two brickshelf folders with pics of Hammerhead and the Blue Bike. I was long due to put up some photos of this pair of cuties. (URL) this week there'll be improvements, competitions and a new and surprising type of Lego (...) (23 years ago, 11-Feb-02, to lugnet.technic, lugnet.robotics, lugnet.build)
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| | Re: Power to RCX
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|
(...) Sorry, I am little confused. Does it mean that everything LEGO did was REMOVING DC adaptor hole to make difference between 1.0 and 1.5 version ? (talking about RCX hardware) and therefore i can connect my wall AC/DC adaptor directly to that (...) (23 years ago, 11-Feb-02, to lugnet.robotics.rcx)
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| | Re: BricxCC release 3.3.3.7
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|
O.K. Well this is good news (sort of) I thought it was just me and my maxed-out P133 that had this problem. I sent an email to our favorite programmer on the weekend concerning it, but I was still not sure it was me. It appeared to me that the (...) (23 years ago, 11-Feb-02, to lugnet.robotics.rcx.nqc)
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| | maths libraries and LPS
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I am new to this newsgroup, so I hope I am not repeating information - I cannot find the solution to this from a search. I am porting a small maths library to the Lego brick at the moment (cos, sin, tan, sinh, cosh, tanh, acos, asin, atan, sqrt, (...) (23 years ago, 11-Feb-02, to lugnet.robotics.rcx.legos)
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| | multiplexor patch posted
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I've posted the multiplexor patch under the patches secetion of the legOS project at sourceforge. (URL) you can't follow that link just go to (URL) then follow the patches link and look for the multiplexor patch. If you improve upon it post the (...) (23 years ago, 10-Feb-02, to lugnet.robotics.rcx.legos)
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| |
| | Re: BricxCC release 3.3.3.7
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|
(...) I have the same kind of problem here (BricxCC release 3.3.3.5, Win2000, Athlon 1.3GHz, 512MB), but I can't relate that to the number of errors, perhaps more to the number of times the compiler is invoked. If I check CPU usage by Brixcc, it (...) (23 years ago, 10-Feb-02, to lugnet.robotics.rcx.nqc)
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| |
| | Re: RFC: Creation of Version 0.2.6
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|
"Michael Obenland" <obenland@t-online.de> wrote in message news:GrBqw5.KL4@lugnet.com... (...) A recursive acronym in the GNU style? KNEBL: KNEBL's Not Endorsed By Lego or snebl, fnebl... Should keep 'em happy :) Tim (23 years ago, 10-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: multiplexor and legOS
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|
(...) Sort of. Try Sourceforge ((URL) is on the "Patches" page (just click on the "Submit New" link). Great Job!! I am looking forward to be able to use the multiplexer finally! I've successfully added the "priority interrupt" patch to legOS 0.2.5 (...) (23 years ago, 10-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: BricxCC release 3.3.3.7
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|
hi John, Also version 3.3.3.7 is becoming very slow sometimes. But now I've another problem: how do I get my toolbuttons back in normal setting. This is an old problem, once you had a solution for it, but now it's back again. When you move quickly (...) (23 years ago, 10-Feb-02, to lugnet.robotics.rcx.nqc)
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| | Re: BricxCC release 3.3.3.7
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|
hi John, you're faster then I can download the newer versions, thanks !! I'm just using 3.3.3.5 "tools" works great, but .... there's a very strange problem, which is not good reproducable: sometimes Bricxcc gets very-very slow (Win98 SE, Pentium (...) (23 years ago, 10-Feb-02, to lugnet.robotics.rcx.nqc)
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| | Re: RFC: Creation of Version 0.2.6
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(...) That was not the cause for my RFC. You do a wonderful job! And legOS does it as well. No real overwhelming cause for doing a new release. (...) Well, not really. I wold favour other solutions first: - if you can go on with legOS-maintainance - (...) (23 years ago, 10-Feb-02, to lugnet.robotics.rcx.legos)
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| | Mindsensors IR servo controller
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Hi I don't know if any robolabers have specific experience of this product (URL) It has caught my eye and would help in a current project - if the RCX can send the required IR signal under robolab control. What do people think, the info on the site (...) (23 years ago, 10-Feb-02, to lugnet.robotics.rcx.robolab)
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| | linux USB driver.
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For anyone who want's it, I have a linux USB driver for the lego IR tower. If anyone is interested, the tar ball of driver and pathces to nqc and legOS can be found at: (URL) am hoping to reconsile my driver with the version that was being worked (...) (23 years ago, 10-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: multiplexor and legOS
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I'm happy to report that after writing the multiplexor driver at the kernel level it's working! I'll post a patch soon once I've got it cleaned up a little bit. It looks like the problem was with the legOS power/read cycle in ds_handler. Once I took (...) (23 years ago, 10-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: Bricks in my Pocket (BimP) now available!
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(...) Palm Users who wish to subscribe, again there are only 7 subscriptions left, can add Bimp to their Avantgo Channel using the link below: (URL) B. Combs, Editor Bricks in my Pocket (BimP) (23 years ago, 10-Feb-02, to lugnet.publish, lugnet.loc.us.in.eva, lugnet.robotics.palm, lugnet.technic, lugnet.robotics, lugnet.publish, lugnet.lego, lugnet.edu, lugnet.cad)
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| | Alpha tester wanted
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Does anyone have the following: 1. A serial Mindstorms IR tower; 2. A Mac running MacOS X; 3. A serial port or adaptor with MacOS X drivers? If so, would you like to alpha-test a version of Robot Controller with serial support? I have written some (...) (23 years ago, 9-Feb-02, to lugnet.robotics.rcx.nqc)
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| |
| | Re: RFC: Creation of Version 0.2.6
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It appears that the time has come for 0.2.6; it has been more than 18 months now since 0.2.5. I still lurk here, but my work with Free Software has consumed my time- even when I'm not paid, I'm pretty much a slave to bugzilla.gnome.org and (...) (23 years ago, 9-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: BrickHeap Wars!
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|
(...) I can't wait!! How many more sleeps to BrickHeap Wars! I think the 3 hour rule is a good idea it gives you too much time to think so you start improving your robot and with my experience it makes them worse. And then there isn't enough time to (...) (23 years ago, 9-Feb-02, to lugnet.robotics)
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| | RFC: Creation of Version 0.2.6
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|
I think it would be a very good idea to incorporate the prio-patch to legOS. But there seem to be a lot of patches and enhancements for 0.2.5. Personally, I use the remote control patch from Zhenrong Zang. And there is the TCP/IP system... Any more (...) (23 years ago, 9-Feb-02, to lugnet.robotics.rcx.legos)
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| | Srial problem
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Hi. I am putting together a Handyboard and have been having success until it came time to test the bootstrap mode. The interface board's voltages check out and it blinks as it attempts to download. I am using an E1 and the Mac 6811 downloader. The E (...) (23 years ago, 9-Feb-02, to lugnet.robotics.handyboard)
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| | Bricks in my Pocket (BimP) now available!
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(...) Content for your PocketPC or Palm is now available. I have been working hard the last few weeks creating a pocket presence for the Advanced Building Brick hobbyist. Using the new Mazingo service, I have created the new e-journal "Bricks in my (...) (23 years ago, 8-Feb-02, to lugnet.publish, lugnet.loc.us.in.eva, lugnet.robotics.palm, lugnet.technic, lugnet.robotics, lugnet.publish, lugnet.lego, lugnet.edu, lugnet.cad)
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| | Priority Interrupt Patch and legOS-0.2.5
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We are gathered here to witness the union of priointerrupt-patch.diff and legOS-0.2.5. If anyone has just cause why these two should not be wed may they speak now or forever hold their peace. Robert Templeton (23 years ago, 8-Feb-02, to lugnet.robotics.rcx.legos)
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| | Magna
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-- MIME ATTACHMENTS DISCARDED: 1. Content-Type: multipart/alternative; boundary="----=_Next....55D0E880" Content-Length: 1068 2. Content-Type: application/octet-stream; name="Magna.url" Content-Transfer-Encoding: quoted-printable (...) (23 years ago, 8-Feb-02, to lugnet.robotics)
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| | PARC's Modular Robotics chain systems - PolyBot
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-- MIME ATTACHMENTS DISCARDED: 1. Content-Type: multipart/alternative; boundary="----=_Next....0CE83470" Content-Length: 1082 2. Content-Type: application/octet-stream; name="PARC's Modular Robotics chain systems - PolyBot.url" (...) (23 years ago, 8-Feb-02, to lugnet.robotics)
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| |
| | Re: BricxCC release 3.3.3.7
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|
Cross-posting to lugnet.robotics in case anyone missed it. I've just uploaded a new release of BricxCC. Version 3.3.3.7 completes the implementation of the configurable Tools feature. Transfer item parameter macros are now functional. The major (...) (23 years ago, 8-Feb-02, to lugnet.robotics)
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| | Re: BrickHeap Wars!
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|
(...) --I say have five tables: four standard and one large area for parts (or just a huge heap of lego parts on the floor), and let the teams duke it out for parts...just like Junkyard Wars! Of course, then you have a small problem with fights (...) (23 years ago, 7-Feb-02, to lugnet.events.brickswest, lugnet.robotics)
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| | Re: We're Famous!
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Hi, You all are making me jealous. Here in South Africa we don't have BrickFests or anything like that... ...*sulk*... ...I wonder if I can get a job overseas... ...hehehehehehe Q (...) (23 years ago, 8-Feb-02, to lugnet.robotics)
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| | Re: BrickHeap Wars!
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(...) We did something like this at my son's birthday party...but with 11yr olds and on a MUCH smaller scale! (We even called it "BrickYard Wars") * We gave each kid one Mindstorms motor, one wire and a 9v battery pack with brand new Duracells in (...) (23 years ago, 9-Feb-02, to lugnet.robotics)
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| | Re: BrickHeap Wars!
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|
(...) David and I are going to work on developing and fleshing out the BrickHeap Wars format during and after BricksWest. We're really going to learn-by-doing, and see what sorts of things work best (and don't). I imagine that we'll end up putting (...) (23 years ago, 8-Feb-02, to lugnet.events.brickswest, lugnet.robotics, lugnet.gaming, lugnet.games)
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| | Re: Any Robot builders on Long Island?( Eastern L.I.)
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(...) I have links to all known robotics clubs on my web site at www.allaboutbots.com. I don't know of any in NY yet, but I did get an email today for a new one in Virginia. For a list of clubs, click on NEWS on my web site. If you know of others, (...) (23 years ago, 8-Feb-02, to lugnet.robotics)
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| | (canceled)
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| |
| | Any Robot builders on Long Island?( Eastern L.I.)
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Hello , I live on long Island near Shirley and was wodering if there are any robot builders interested in starting a club. E-mail me : Bmajik5127@aol.com -Michael (23 years ago, 8-Feb-02, to lugnet.robotics)
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| | Re: We're Famous!
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|
(...) Just to interject something cool here, you all will be even more famous after BricksWest! By special arrangement with the publisher, I'll have copies of "Building Robots with LEGO Mindstorms" for sale at BricksWest (at 45% off the standard (...) (23 years ago, 7-Feb-02, to lugnet.org.ca.rtltoronto, lugnet.robotics, lugnet.events.brickswest)
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| | Re: Web Interface
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Hi Shibu, WebBrick 2.4 is a program that lets you connect your Lego Mindstorm's robot to a web-page user interface. When anyone on the internet connects to your web page, they can press buttons on the page that activate your robot. There are 6 (...) (23 years ago, 7-Feb-02, to lugnet.robotics)
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| | Web Interface
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hey Guys, Do any one of ull have information how i could interface the Lego Mindstorm to the internet, if so do keep me posted. Shibu (23 years ago, 7-Feb-02, to lugnet.robotics)
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| | Re: Sensor Connector
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|
The LEGO shaft encoder and light sensor are active sensors that need a special circuit. The Expansion Board for the HB provides this ckt and the requisite drivers. Your simplest path to using these with the HB is to get an Exp Bd. Barring that, you (...) (23 years ago, 7-Feb-02, to lugnet.robotics.handyboard)
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| | Re: Simple Sensor interface, was Re: Question?
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Thanks for adding that information. I had intended the schematic more as an exmaple than something that someone would run out and try to make. The parts are all surface mount parts, since I have been building and supplying this circuit enclosed in a (...) (23 years ago, 7-Feb-02, to lugnet.robotics)
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| | Re: multiplexor and legOS
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|
Still no luck in getting the mux working properly. I tried making use of the code for turning sensors on and off but later realized that the ds_handler code would still be turning the sensor off as part of its normal operation. I think I'm going to (...) (23 years ago, 7-Feb-02, to lugnet.robotics.rcx.legos)
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| | Simple Sensor interface, was Re: Question?
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|
Thanks for publishing this... I have trouble locating infos on regulator "81250", I suppose it is a 5V LDO, but couldn't find manufacturer/datasheet For other curious people, datasheet of the dual shottky diode MA704 is here: (URL) the opamp here (...) (23 years ago, 7-Feb-02, to lugnet.robotics)
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| | Re: Sensor Connector
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(...) Thanks, I thought there might be a special connector but I see now that its a standard enough connector. Another question: How can I get the handy board to read from the lego rotation sensor and the lego light sensor? I can get the touch (...) (23 years ago, 7-Feb-02, to lugnet.robotics.handyboard)
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| | Re: Question?
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I've put a simple sensor interface design on Brickshelf which shows the key elements of providing a linear bi-polar connection to the RCX sensor input. (The two wire RCX connections are represented by the large circles to the right of the (...) (23 years ago, 7-Feb-02, to lugnet.robotics)
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| | Re: Lost my IR Tower
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|
Hi, I can post it on my site as well... ...when it is finished. :) Q (...) (23 years ago, 7-Feb-02, to lugnet.robotics)
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| | Re: Question?
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|
Hi Peter, (...) it works for me. (URL) shows another schematics that doesn't show the real rotation sensor circuit, but has the same interface to the RCX. (...) Yes, that's the case. (...) That's what the rectifier bridges are for. (...) With the (...) (23 years ago, 7-Feb-02, to lugnet.robotics)
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| | Vision Command...
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|
Greetings Mindstormers, I have just unwrapped my brand new Vision Command, gawsh... ...I can't wait to get home and begin playing... ...anyway I am rambling now... ...let me get back to my original question. Is there anyway to write software in Java (...) (23 years ago, 7-Feb-02, to lugnet.robotics)
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| | Re: Lost my IR Tower
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|
(...) I'd be happy to find a home for it on my Lego pages. ---...--- Steve Baker ---...--- Mail : <sjbaker1@airmail.net> WorkMail: <sjbaker@link.com> URLs : (8 URLs) (23 years ago, 8-Feb-02, to lugnet.robotics)
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| | Lost my IR Tower
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|
Hi This is probably of no interest to anyone else but... When I bought my Mindstorms (for US$15 in a charity shop) it was missing the IR Tower. I'd allotted myself an hour to build a Tower but I suspect the IR components I was using were the wrong (...) (23 years ago, 7-Feb-02, to lugnet.robotics)
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| | Re: Question?
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(...) I meant that the sensor can be connected either way round. (...) (URL) link! I've yet to find a working link to _any_ schematic of the light or rotation sensor (...) current, and "light" is full current, regardless of polarity. Maybe that is (...) (23 years ago, 7-Feb-02, to lugnet.robotics)
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| |
| | BrickHeap Wars!
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|
BricksWest will host the first ever BRICKHEAP WARS event. This is a competition loosely based on Junk Yard Wars. This particular episode will be a LEGO Mindstorms competition. All materials (1) will be provided at the competition. No outside LEGO (...) (23 years ago, 7-Feb-02, to lugnet.events.brickswest, lugnet.general, lugnet.announce, lugnet.robotics) !!
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| | RE: Motorized landing gear question
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|
You might also want to check out the landing gear for the 8480 Space Shuttle (my all-time favorite set, BTW :) on Lugnet. It uses shafts and cogs to move the landing gear, but when the landing gear is extended the weight is borne by the frame of the (...) (23 years ago, 7-Feb-02, to lugnet.robotics)
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| |
| | BricxCC release 3.3.3.7
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|
I've just uploaded a new release of BricxCC. Version 3.3.3.7 completes the implementation of the configurable Tools feature. Transfer item parameter macros are now functional. The major feature enhancement in this release, however, is the addition (...) (23 years ago, 6-Feb-02, to lugnet.robotics.rcx.nqc)
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| | Re: Sensor Connector
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|
Info on doing this is at (URL) . The male strip header is 929400-01-36-ND from Digikey. Fred (...) (23 years ago, 6-Feb-02, to lugnet.robotics.handyboard)
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| | Re: Sensor Connector
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|
(...) Oh, that's easy. Just check out your local electronics store. I don't know if there is a Fry's Electronics in your area, but they have them. Radio Shack? I don't know, but I would assume anyone who sells electronic components would have them. (...) (23 years ago, 6-Feb-02, to lugnet.robotics.handyboard)
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| | Re: Sensor Connector
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(...) Actually what I was looking for was how to make the male header pins to connect to the HB. Is there anywhere to buy them or how did you make them. Thanks for your answer, brendan (23 years ago, 6-Feb-02, to lugnet.robotics.handyboard)
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| | Re: Sensor Connector
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|
(...) Actually, you can make a half way decent replica of the Lego two plate high connector at this point quite easily. When you prepare the 2x2 piece of the electric plate, cut the center circular section away from the underneath. Then, solder the (...) (23 years ago, 6-Feb-02, to lugnet.robotics.handyboard)
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| | Re: Sensor Connector
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|
I've bought some lego electric plates (part 5037) from lego.com, and they seem to be withstanding the heat of a soldering iorn quite well (that was my fear... that I would turn them into bubbling messes). Actually they're holding up better than the (...) (23 years ago, 6-Feb-02, to lugnet.robotics.handyboard)
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| | Sensor Connector
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|
I currently have lego motors and wires that I have used with the RCX but now Im using the Handy Board. The book explains how to connect the motor to the handy board by connecting a wire to a sensor connector but it doesnt state where to get such a (...) (23 years ago, 6-Feb-02, to lugnet.robotics.handyboard)
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| | Re: Ultrasonic Sensor
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|
(...) Sound travels on the order of 333m per second, so with the 3ms interval between sensor readings you will get a resolution of 1m. You could try some heavy machine level hackery inside legOS or leJOS to read the sensors in a shorter interval, I (...) (23 years ago, 6-Feb-02, to lugnet.robotics)
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| | Re: Ultrasonic Sensor
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|
(...) let (...) Thanks for that Steve. My circuit will be based on the latter of the two possibilities. It is based on a design by RA Penfold from Electronics and Beyond (Sept.2001) so I'm basically doing construction by numbers! However, the thesis (...) (23 years ago, 6-Feb-02, to lugnet.robotics)
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| | Re: Ultrasonic Sensor
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(...) Yep - I thought so...for things like cameras where these things are in common use, the need is only to know the range to the nearest object. I don't even know if the other things (multiple object detection and size/reflectance estimation) are (...) (23 years ago, 6-Feb-02, to lugnet.robotics)
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| | Re: Ultrasonic Sensor
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|
(...) let (...) Thanks for that Steve. My circuit will be based on the latter of the two possibilities. It is based on a design by RA Penfold from Electronics and Beyond (Sept.2001) so I'm basically doing construction by numbers! However, the thesis (...) (23 years ago, 6-Feb-02, to lugnet.robotics)
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| |
| | Help with Homebrew sensor
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|
Hi all, my name is Francis (from Spain). I've read Extreme MindStorms and I decided to put my hands on and build some new sensors. I began with the optointerrupter, but have a little trouble. When I connect the sensor to the RCX I can't get a stable (...) (23 years ago, 6-Feb-02, to lugnet.robotics)
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| | Re: Ultrasonic Sensor
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|
(...) I guess the first question I'd ask is "What interface does the sensor present to the RCX?" I imagine there are two possibilities: It could be a raw interface that let you send an acoustic "PING" on command and read a voltage back telling you (...) (23 years ago, 6-Feb-02, to lugnet.robotics)
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| | Real time operating system resources
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|
Now that my interest has been piqued by the multiplexer problem (and sensing problem in general), what would some of you hardened embedded/real-time system veterans recommend for reading on the subject. Two books that I've found at Amazon.com are (...) (23 years ago, 6-Feb-02, to lugnet.robotics.rcx.legos)
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| | Ultrasonic Sensor
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Hello all. This topic might be a bit old hat for some of you, but as a relative newbie to the world of Mindstorms, I'm posting in the appeal for any information on Ultrasonic Sensors. The brief of my honours project was to design and build one such (...) (23 years ago, 6-Feb-02, to lugnet.robotics)
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| | Re: Power to RCX
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|
Success! It works now, and gives 9.2 volts according to the RIS software. You were right, I did have it backwards. Thanks. (...) (23 years ago, 5-Feb-02, to lugnet.robotics.rcx)
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| | Re: multiplexor and legOS
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|
(...) I'm just checking this thing out. You can look at: (URL) more information. Unfortunately, I got the .ps description file but not the source code patch file. A mail asking for it is on it's way ;) Mike (23 years ago, 5-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: multiplexor and legOS
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|
(...) Actually, something like this has been documented and done by Pedersen, Christensen, Rasmussen ("Prioritized Interrupts in LegOS"). They actually document the problem of sensor misses related to task management, significantly reducing the (...) (23 years ago, 5-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: Running Vision Command on XP
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|
(...) I now have Studios up and running within XP. I had to download a new driver from the Logitech site for the camera and then it was just a case of setting the compatibility option for Lego Studios so that it thinks it is still running in Win (...) (23 years ago, 5-Feb-02, to lugnet.robotics.vc)
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| | Re: multiplexor and legOS
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|
(...) Most people's legOS kernels will be compiled so msleep uses wait_event. I haven't looked at the code, but my understanding of how wait_event works is that whenever that thread becomes eligible to execute, your even function is called. (...) (23 years ago, 5-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: multiplexor and legOS
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Try the following code fragments. [Change to fixed spacing font so that it reads easily.] You should be able to find what you need. "Mark Falco" <> wrote in message news:Gr1MBL.Dop@lugnet.com... (...) <<..snip..>> (...) These are code fragment for (...) (23 years ago, 5-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: multiplexor and legOS
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Ok, my last port didn't make much sense let me try that again. for an active sensor ds_handler will periodically power the sensor off to read the value. The standard firmware does this to but at a different interval. I'm wondering if this is part of (...) (23 years ago, 5-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: multiplexor and legOS
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Since I'm now fairly sure that i've got the timing taken care of I'm wondering if the power cycling that ds_handler does is somehow causing the problem? I thought I might take control of this stuff in my test code. I assume if I set the sensor for (...) (23 years ago, 5-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: multiplexor and legOS
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(...) It looks like the semaphore task_sm should prevent another task from being scheduled if I hold it for the length of the train. I've now tried this as well as incresing the timeslice to 100ms. It looks better but still is not consistent. Since (...) (23 years ago, 5-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: Motorized landing gear question
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(...) (These are identical to Mindstorms motors - right? Certainly the motors *I* picked up from Znaps sets are indistinguishable from Mindstorms motors ...I don't think they ever shipped a different one with Znaps.) (...) Well, the worm gear should (...) (23 years ago, 5-Feb-02, to lugnet.robotics)
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| | Re: Motorized landing gear question
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(...) I'd suggest it's not necessary for the landing gear to lift the craft - just to hold it up. If it's only operated while there's no weight on the craft, it becomes much easier, you only need some kind of locking mechanism so the motor isn't (...) (23 years ago, 5-Feb-02, to lugnet.technic, lugnet.robotics, lugnet.space, lugnet.znap)
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| | Re: multiplexor and legOS
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(...) Not bad. But as you say, still vulnerable to the task switching problem. (...) Instead of resorting to that, maybe there is a way to freeze task switching during critical operations. When I owned and programmed the AmigaOS (don't laugh :), (...) (23 years ago, 5-Feb-02, to lugnet.robotics.rcx.legos)
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| | Motorized landing gear question
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I've been pondering using one of the Znap motors to power a landing gear mechanism strong enough to at least hold, if not lift a decent sized space craft (including the motor and battery box- if possible) Any ideas? I was thinking worm gear and some (...) (23 years ago, 5-Feb-02, to lugnet.technic, lugnet.robotics, lugnet.space, lugnet.znap)
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| | Re: multiplexor and legOS
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#include <sys/time.h> void systime_set_timeslice (unsigned char slice); include/sys/time.h:43-45: #ifdef CONF_TM #define TM_DEFAULT_SLICE 20 file://!< default multitasking timeslice #endif hope that helps, Albert "Michael J Ash" (...) (23 years ago, 4-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: multiplexor and legOS
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(...) I agree about the cause for the msleep granularity, I'd seen the same stuff in tm and assumed that would cause the problem. Sorry my last note was a little unclear, I tried msleep and delay but am now using my own function which seems to (...) (23 years ago, 4-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: Secondary Education Robotics
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(...) Hi, have a look at (URL) is more than two years of work with secundary students. Claude Baumann (23 years ago, 4-Feb-02, to lugnet.robotics.edu)
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| | Re: multiplexor and legOS
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(...) I don't know about this 20ms granularity and how delay() is going to be any better. Here's the code for each function: //! delay execution allowing other tasks to run. /*! \param msec sleep duration in milliseconds \return number of (...) (23 years ago, 4-Feb-02, to lugnet.robotics.rcx.legos)
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| | Secondary Education Robotics
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Hi, I'm part of a university group trying to compile a list of ways that robotics are being used in high school classrooms. If you are a person involved with the use of robotics in high school science, math, and technology courses, and are (...) (23 years ago, 4-Feb-02, to lugnet.robotics.edu)
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| | Re: multiplexor and legOS
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(...) Thanks, I'd suspected that msleep might not be very accurate but never considered that it's true granularity could be so large. I did a quick test with my current configuration and when I asked msleep to sleep for 12ms it slept for 20. This (...) (23 years ago, 4-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: Question?
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(...) No, there's no bridge in the RCX, just a pull-up to 5V (10kOhm IIRC). If you look at the schematics (say at (URL) see that there is another bridge rectifier in the sensor between ground and the raw sensor output. The ground half of the bridge (...) (23 years ago, 4-Feb-02, to lugnet.robotics)
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| | Re: true tcp/ip on the RCX
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(...) The C64 server survived the "Slashdot attack" without problems, even though it served tenths of thousands of pages over a period of only a few hours. Since it is configured to allow only 10 simultaneous connections, it could more or less serve (...) (23 years ago, 4-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: JAVA for 9751 Lego interface - SOS
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(...) It seems this thing connects to a serial port. So you need a Java interface to the serial port like rcxcomm, and you need to write a few classes that talk to the thing (see (URL) would be nice to have some common abstractions of the RCX (...) (23 years ago, 3-Feb-02, to lugnet.robotics)
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| | Re: multiplexor and legOS
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(...) Don't ask me for a cite, but I seem to remember something about msleep only having 20ms granularity. If that's the case, your msleep(10) is either not sleeping at all or is sleeping 20ms, either one of which could cause problems. I'd suggest (...) (23 years ago, 4-Feb-02, to lugnet.robotics.rcx.legos)
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| | Re: Question?
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(...) My guess (having never looked at the schematics, or taken one apart) is that when connected backwards, "dark" would be 0V and "light" would be -8V. Again, a simple bridge rectifier (this time in the RCX) would get it sorted out. It might be (...) (23 years ago, 4-Feb-02, to lugnet.robotics)
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| | Re: Question?
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(...) What I don't understand is how this works if the sensor is connected backwards. Sure, a bridge rectifier will get the power sorted out but how does the sensor send back a voltage in the right range? If say "light" is 8V and "dark" is 0V then (...) (23 years ago, 3-Feb-02, to lugnet.robotics)
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| | Re: multiplexor and legOS
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well anyone who looked at the code I attached may have notcied that I had one of the msleeps commented out. Oops, with this now uncommented I at least see the second and third light sensors pulse on, but only for an extremely short time. Suring the (...) (23 years ago, 3-Feb-02, to lugnet.robotics.rcx.legos)
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| | This week in Robotics:
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THIS WEEK IN ROBOTICS: Here is a calendar of events coming up this week - February 2rd - 9th, 2002. Details are on our web site at (URL) you know of an upcoming event of have a robotics club or organization, please drop us a note at (...) (23 years ago, 3-Feb-02, to lugnet.robotics)
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| | Re: Power to RCX
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Regarding the data sheet for the Melexis MLX1040B that everyone is talking about, and which I've been looking for for years.... This link: (...) (URL) comes back as NOT FOUND The fact that some people are claiming to have seen it implies that it was (...) (23 years ago, 3-Feb-02, to lugnet.robotics.rcx)
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| | Vision Command $29.99 @KB Toys online
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FYI - at least their markdowns are sometimes worthwhile. This was online through what used to be eToys - any KB toys should work. Almost as cheap as the eToys markdowns. There's still the Windows 98 requirement but...... (23 years ago, 2-Feb-02, to lugnet.market.shopping, lugnet.robotics)
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