 | | two RC servo motor interface to the RCX
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Hi All, the idea to control two RC servo motors via the RCX was a new challange to me and now, after finding a solution, (see www.inchlab.com) i'd like to know if some one else also figured out a diferent solution to this problem? Let me know... (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Battery Tests
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The Unibots tested a bunch of different batteries in preparation for the Northern California State FLL tournament last December, without a doubt the Energizer e2 Lithium batteries (the kind in a blue package) outperformed all others, lasting through (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | RE: two RC servo motor interface to the RCX
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(...) Try: (URL) It requires pbForth, but you can build the servo encoder with only a few basic parts, not mocrocontroller! Cheers, Ralph (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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(...) Hey, that was a great idea! I couldn't use ?/: to do it (NQC doesn't know those operators), had to actually write out all the if/else, but I actually just added it into my wheel generation program, so it printed out the function for me and I (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Internet Controlled Robots
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(...) Try this: (URL) (24 years ago, 12-Apr-01, to lugnet.robotics.rcx.robolab, lugnet.robotics.edu, lugnet.robotics)
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| | Re: Struggling with encoder wheel
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(...) The light sensor just doesn't have that kind of resolution. I'd never get a very accurate position by doing that, I wanted a finer positioning system than I can get from using a rotation sensor. I'm trying to build something that's got (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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(...) I thought about something like that, but using 2 wheels and 2 touch sensors, not just one, and using my 2 bit encoding system like on the light sensor wheel. But I'm not sure how to build small round things out of Lego that have 36 divisions (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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(...) You could build a rotation sensor found on Michael Gaspari's site, using a magnetic strip. It is supposed to give 40 or so counts per revolution. Andy (...) -- See my Visual Interface for leJOS at (URL) (24 years ago, 13-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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(...) Yah, but if I'm gonna build my own sensors, there's a lot I could do. I'm sort of a purist. I'm trying to stick with the stock sensors so that most people can build a copy of my system. Printing out something on a printer and gluing it to (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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Hello, (...) What is Lego made out of? ==> ABS plastic What can you buy in sheets with the same thickness as Lego? ==> ABS plastic So what I would do if I were you is go to a modelbuilder's supplier and ask for a sheet of ABS of 1.5 (?) mm thick. (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Curved Feet
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Your comment about the wheels is the main annoyance of the inflexibility I mentioned. Re beams: Heh, I had several of the old Expert Builder Sets so I had an overload of beams. I've been buying lots of parts trying to bring up my inventory of more (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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hi Chris, (...) That's in fact a good principle. Isn't it possible to improve the dynamic range of the light-sensor by taping the red LED, I read that somewhere but I don't know where. Why not use a continuous grayscale, with pure with and black (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Problems with the scout
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(...) Are you *sure* it didn't run? A program with just one instruction would run in less than a thousandth of a second - you might not notice! (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Amiga Software
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(...) It's not especially posix, but you can open a file named "SER:" with fopen and read and write to it that way. It's quite simple. (...) If you have trouble getting it going, shout. I have a working 3000/060 still, and the SAS C++ compiler. I (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: two RC servo motor interface to the RCX
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hi, (...) Ok, I dont know anything about servo's, but your schematics and explanations looks good. (Very well documented, nice work) (...) How can an indivudual compete with a "design group" ? The steam-engine and the Stirling motor are also far (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | RE: two RC servo motor interface to the RCX
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(...) Please don't get the wrong impression - my "design group" is me doing embedded systems design and my wife doing architectural illustration. I guess two people is a group...:-) Cheers Ralph (24 years ago, 13-Apr-01, to lugnet.robotics)
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| | Re: Pneumatic Pump Testing Goes Hi Tech
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Would be glad to compare notes. Directly I have finished the tests I'll get back to you. (...) (24 years ago, 13-Apr-01, to lugnet.robotics, lugnet.technic, lugnet.build, lugnet.dacta)
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| | Re: Motor with Gear Reduction ??!??
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(...) Here's a good comparison of the geared motor, ungeared motor and micromotor: (URL) Regards Micah J. Mabelitini - LUGNET #918 - accutron@kih.net The University of Kentucky - SECC Middlesboro ASC (URL) (24 years ago, 13-Apr-01, to lugnet.build, lugnet.robotics)
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| | Re: two RC servo motor interface to the RCX
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(...) Thanks for the link to your page. That was what i am looking for. Just an alternative for that problem. Brilliant pages! One reason for me, using a PIC microntroller in two of my designs was, that if i manage to implement the serial interface, (...) (24 years ago, 13-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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(...) I did an experiment printing out many different gradients and I now understand part of your problem. It was hard to get any change in the reading (~40 - 50). So next I then cut a wedge shaped slit in a piece of white paper. Aiming the sensor (...) (24 years ago, 13-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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As I am not so purist, I think that an angle sensor based on a small potentiometer (There's a description on Michael Gaspari's site) would be the simplest solution... But your absolute encoder is a challenge in itself! What about using two (...) (24 years ago, 13-Apr-01, to lugnet.robotics)
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| | Re: Junkyard Wars (was: Re: robotica on TLC)
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(...) The closest I know is RoboGladiator: (URL) Jürgen Stuber <stuber@loria.fr> (URL) (24 years ago, 13-Apr-01, to lugnet.robotics)
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| | Re: Motor with Gear Reduction ??!??
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(...) Two, one on each side. I've not looked inside, but they seem comparable to the gear motor in the RIS. Jürgen (24 years ago, 13-Apr-01, to lugnet.robotics)
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| | Team Challenge vs RIS1.5
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Does anyone know the physical differences between the ROBOLAB Team Challenge Set from Dacta and the ROBOTICS INVENTION SYSTEM 1.5? Both sets have: 1 RCX 2 Motors 2 Touch Sensors 1 Light Sensor The Team Challenge set has 715 pieces, RIS1.5 has 717. (...) (24 years ago, 13-Apr-01, to lugnet.robotics)
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| | Orthogonal Robot Drive
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I have put up a web page with some pictures of my orthogonal drive robot. You can find it here: (URL) others have built this kind of robot I would be interested to hear from you. Cheers, Tom. (24 years ago, 13-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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(...) That was the first version of the webcam mount. After rotating back and forth a few times you can't tell where the camera is anymore. There also aren't any 42 tooth gears BTW, just a 40. Last night I used the datalog to record what the light (...) (24 years ago, 13-Apr-01, to lugnet.robotics)
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| | Re: Problems with the scout
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Are you using a version of RCX Command Center that supports the Scout? The original RCXCC did not support Scout and only the recent updates made by others have added Scout support. I have just started using the version put out by John Hansen and it (...) (24 years ago, 13-Apr-01, to lugnet.robotics)
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| | Robowarriors
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I've now pretty much finished the Lego Robowarriors web-site. It's meant to be a place to find everything you want to know about Lego robot combat -- Robot Wars/Battlebots with Lego. I'm trying to build a comprehensive database of peoples' Lego (...) (24 years ago, 13-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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(...) I have noticed the lost count phenomenon also (you attribute it to gear slop on you web page, but gear slop will give you errors in the 1/2 a tooth range or less and it doesn't get worse over time). In fact there was a very long thread about (...) (24 years ago, 13-Apr-01, to lugnet.robotics)
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| | Receiving IR data
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Hi there, I'm new to the group, so I'm not too sure what's on and off topic: if this is off-topic, sorry in advance. I was looking at using the IR tower that comes with Mindstorms for my own use, but I also wanted to experiment using it to (...) (24 years ago, 13-Apr-01, to lugnet.robotics)
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| | Re: Junkyard Wars (was: Re: robotica on TLC)
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(...) robots. (24 years ago, 13-Apr-01, to lugnet.robotics)
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| | Re: Junkyard Wars (was: Re: robotica on TLC)
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(...) Hello, My friends and I are doing a thing called BattleBricks. We've had autonomous and rc battles. Our competition list consists of both AI & Manual robotics. While RoboGladiators was a one time thing put on by Lego, we are a group of guys in (...) (24 years ago, 14-Apr-01, to lugnet.robotics)
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| | Micromotors and Fiber Optics
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Is anyone currently interested in incorporating micromotors and fiber optics into their robotic creations? My son loves using the fiber optics modules in his non-robotics, but I haven't had the time to use any of my extras in any projects lately. (...) (24 years ago, 14-Apr-01, to lugnet.robotics)
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| | Re: Team Challenge vs RIS1.5
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(...) Hi, I posted this info just a while back (URL) C S Soh CSSoh's Lego Pneumatics (URL) where air is power! (24 years ago, 14-Apr-01, to lugnet.robotics, lugnet.dacta)
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| | Re: 2.0 Firmware
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In article <GBowDn.LKr@lugnet.com>, Dean Hystad <dean.hystad@mts.com> writes (...) I get the message 'Error Starting Program ----- The ATLCLIENT.EXE file is linked to missing export ATL.DLL:57' and then 'G:\Program Files\RcxCC\RCX2\ATLClient.exe (...) (24 years ago, 14-Apr-01, to lugnet.robotics)
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| | Re: Team Challenge vs RIS1.5
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(...) The only problem with this is that it is now wrong. The Team Challenge set is sold in the US for $199. The same price as RIS. (24 years ago, 14-Apr-01, to lugnet.robotics)
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| | Re: two RC servo motor interface to the RCX
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(...) Well I didn't know how small your group is, besides the size, the individuals in the group are doing something different, OK so it isn't a group. The reason of my reaction, I meant to taste negative critics in your first reaction (maybe it's (...) (24 years ago, 14-Apr-01, to lugnet.robotics)
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| | Re: Receiving IR data
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hi James, Sorry I don't know the answers, but I'm communicating with Delphi through the spirit.ocx, which seems to be a bit too slow. I'm able to control my serial port, but do you know how to control the IR-tower, where did you get the information (...) (24 years ago, 14-Apr-01, to lugnet.robotics)
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| | RE: Receiving IR data
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Stef, I've used spirit.ocx, but I just wanted to "hack" it that little bit further. I got the IR protocol information from the RCX Internal's site: (URL) a more details explanation of what I did would help, it can be found at: (URL) -----Original (...) (24 years ago, 14-Apr-01, to lugnet.robotics)
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| | Re: 2.0 Firmware
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(...) ATL.dll is located in windows\system on my system. It is the Active Templates Library and was installed by Visual C++ (it's probably used by many different programs though). You can download it from microsoft at: (URL) Luck (24 years ago, 14-Apr-01, to lugnet.robotics)
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