 | | Re: Bump switches and "aggression"
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"Russell C. Brown [RR-1]" <lego-robotics@crynwr.com> wrote in message news:001601c3baeb$9a...apophis... (...) ok :) you are right i was too touchy sorry the threshold's set no problem some of you guys said many great words to me that is precious! (...) (22 years ago, 5-Dec-03, to lugnet.robotics)
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| | RE: Bump switches and "aggression"
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Just set the threshold on your pretentiometer to 50% and you won't hear that traffic anymore! Seriously, Pixel, you have been a cheerful contributor to this list for a couple of years now. You've had creative ideas that you've been most willing to (...) (22 years ago, 5-Dec-03, to lugnet.robotics)
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| | RE: Bump switches and "aggression"
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(...) Creatures (animals and humans) do not scatter in a totally random direction. They scatter at a random vector in a direction opposite the source of whatever startled. That implies that more than one sense is being used to determine source (...) (22 years ago, 5-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) Yes, I understand that you would have the downward pressure of the step move stop the leg movement by cutting off pressure to the piston(s) driving the foot down. Once this pressure is cut off by the switch, presumably the other legs continue (...) (22 years ago, 4-Dec-03, to lugnet.robotics)
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| | Re: Bump switches and "aggression"
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(...) Easy the bump switch jumps into a RNG, and it's important to understand that the output of a RNG does -not- need to be equi-probable, and it decides. Watch animals when they're startled, they don't stop and think, they jump around for a second (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: Complete instructions for Linux?
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(...) $ tar xvzf brickos.tar.gz $ make or $ apt-get install brickos #for debian user ;-) nanobapt (22 years ago, 4-Dec-03, to lugnet.robotics.rcx.legos)
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| | Re: Search algorithms
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The main problem is of course memory. Under standard firmware, with 32 variables, you're not going to be able to do an A* on much of a grid - 7x7 is about the max, and even then you'd have to fiddle around and store two cells values in a single (...) (22 years ago, 4-Dec-03, to lugnet.robotics)
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| | Re: Bump switches and "aggression"
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"Gordon Elliott" <lego-robotics@crynwr.com> wrote in message news:0f7901c3b9c8$84...gateway... (...) i can see jim's doing good job !!! he's humiliating almost everyone here keep doing jim!!! maybe you will achieve that your posts will go to null (...) (22 years ago, 4-Dec-03, to lugnet.robotics)
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| | Re: Bump switches and "aggression"
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(...) That's nonsense! You are working on the very naive assumption that nothing in the environment is moving except your robot. If your strategy is to reverse direction when the robot bumps into something in *any* direction - then things will go (...) (22 years ago, 4-Dec-03, to lugnet.robotics)
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| | Complete instructions for Linux?
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Is there a complete instruction for installing BrickOS on Linux? I'm particularly interested in details involving creating a cross-compiler and getting the USB tower to work. I've looked at the windows instructions, and have tried to work from them, (...) (22 years ago, 4-Dec-03, to lugnet.robotics.rcx.legos)
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| | Bump switches and "aggression"
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To my thinking there are two approaches to this, really two levels of difficulty, - Make it deterministic, in that if a switch is bumped invert your current trajectory axis, if going forward then reverse, if going R then go L. - Make it more (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | RE: Bump switches and "aggression"
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(...) <SNIP> (...) I think that your example indirectly shows that there are two things to be aware of. Survival is one. Obstacle detection/avoidance is the other. In thinking about it, I can see where there is a fine line between the two. Consider (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) So the pneumatic switch acts as a pneumatic touch sensor and stops the leg from extending fully. I'll keep that in mind. (...) I understand. Thanks for the explanation. (...) Kevin (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: Bump switches and "aggression"
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(...) Oh I wish I had some of those touch sensors! One person from rtlToronto has a set and there is much envy from me to him. Right now I'm using lamp bricks, which isn't that great, really, but does work :) Thanks for the heads-up! Dave K (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: Bump switches and "aggression"
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(...) go (...) 'bumper'. (...) my (...) me, (...) alternative. (...) There is one solution for staying 100% Lego and putting 4 sensors on the same RCX input. Therefor you should be able to sense which direction you were getting bumped. Lego made (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: Bump switches and "aggression"
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(...) <snip> (...) <snip> I'm very new to this particular thread, but I like Gordon's approach--directional sensors are needed. If I'm travelling forward and something bumps me from behind, I need to know that--If my conditional response is to do (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: Bump switches and "aggression"
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----- Original Message ----- From: "Jim Choate" <ravage@einstein.ssz.com> (...) was (...) ## The original request was to catalog opinions on bump sensors, a "state of the art". Remember the original question was: ** ... and I'm curious if anyone (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: Bump switches and "aggression"
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(...) You should watch my three dogs hunt. If all you've ever seen is a single dog hunt then you know nothing of how dogs actually hunt. They're pack animals, a single dog can't survive in the wild more than a few weeks. Yet three sub-200lb dogs can (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: Bump switches and "aggression"
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----- Original Message ----- From: "Jim Choate" <ravage@einstein.ssz.com> To: <lego-robotics@crynwr.com> ... (...) think (...) ### I think this is an interesting question, relating to complexity and emergent and evolutionary behavior which has been (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: Bump switches and "aggression"
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(...) How exactly, do you want to trigger this 'fight or flight'? It seems to me that a rabbit (for example) would use both of the methods above. If it's running along, and it's nose smacks into a tree (I mean bumps into a tree) the behavior is very (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: Strange BrickOS Timing
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Hi Dietmar, (...) Of course :-) Ciao, Guido (22 years ago, 3-Dec-03, to lugnet.robotics.rcx.legos)
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| | Re: Strange BrickOS Timing
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Hi Guido, (...) That patch referes to an older transfer-protocol. The one we are using now, does not need SUCH a stable timing. But the Output from BrickOS is a lot worse than it was in older versions. I thing Gunther can explain this better, but I (...) (22 years ago, 3-Dec-03, to lugnet.robotics.rcx.legos)
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| | Bump switches and "aggression"
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I mentioned a 'reference platform' for the H18 group I've been working on in a previous post, and I'm curious if anyone will share their views on how they view bump switches and 'behavior'. I'm not interested in a debate but rather a 'collection'. (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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"Kevin L. Clague" <kevin_clague@yahoo.com> wrote in message news:HpAAsB.1Kpo@lugnet.com... (...) hmm my english is not very well so i'm explaining in weak way let's say your q242 is walking on a flat surface everything is quite well now ahead q242 (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Roll up, roll up!
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Sunday - December 14 - WAMALUG meeting at GMU - Light Weight Sumo! WAMALUG get togethers are always fun. The upcoming December meeting will be great because we're having a light-weight Sumo contest. Competing 'bots will be subject to a one pound (...) (22 years ago, 3-Dec-03, to lugnet.general, lugnet.robotics, lugnet.org.us.wamalug)
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| | Seeking session/expo coordinators for sculpture/mosaic, castle, mindstorms/technic/robotics
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The BrickFest PDX organizing committee is seeking session/expo volunteers for the following areas: Sculpture/Mosaic Castle Mindstorms/Technic/Robotics These are important areas that don't yet have dedicated coordinators. If you're planning to attend (...) (22 years ago, 3-Dec-03, to lugnet.events.brickfest, lugnet.castle, lugnet.build.sculpture, lugnet.build.mosaic, lugnet.robotics, lugnet.technic, FTX) !
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| | Re: Strange BrickOS Timing
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Hi Gunther, (...) have (...) After some investigation I found this page on YOUR site: (URL) YOU state: Using Lepomux requires a stable timing on the motor port because it is used as a serial data port. Since brickOS does a lot of stuff (...) (22 years ago, 3-Dec-03, to lugnet.robotics.rcx.legos)
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| | Re: Strange BrickOS Timing
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Hi Gunther, (...) have (...) I'm NOT really an expert in brickOS, but these are the sources of delay and msleep: void delay(unsigned ms) { unsigned i; while (ms-- > 0) for (i = 0; i < 600; i++) // not well calibrated. ; } //! delay execution (...) (22 years ago, 3-Dec-03, to lugnet.robotics.rcx.legos)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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i regret i wrote my previous post here it will never happend again jim plays unfair but this is not proper forum to talk about that sorry to all eot !!! pixel (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) Roger doger on that. I understand that C. Elegins (sp?) is the current top project goal for this sort of stuff. Something like 10,000 neurons. -- -- Open Forge, LLC 24/365 Onsite Support for PCs, Networks, & Game Consoles 512-695-4126 (Austin, (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) There's no fault involved from my perspective. The idea is to have fun. You can't do that without some sort of risk (at least I've never experienced 'fun' without some risk). The problem comes when people mix emotion/ego with curiosity. Very (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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Ah, I do suspect that my data was a little out of date. However the information I see ((URL) Word ".doc" file, or (URL) ) list the housefly at 10^5 or 100,000, to 10^6 or 1 million neurons. This is a little bigger than "400 neurons." In fact the (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) That was true 20 years ago. A housefly's brain contains just 400 neurons. Your PC can easily simulate a 400 neuron neural network at faster update rates than biological neurons. The problem isn't the raw computational power. ---...--- Steve (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) True. (...) I was just picking on you since you've spent your day publicly humiliating people (dripping with sarcasm :^) I have plenty of silly and/or stupid ideas..... Some of them lead to really great ideas. (...) No doubt. Flaws are a (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Re: NQC's future
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I would like functions to be able to return something other than zero. (If there's a way to do this (other than global variables) already, please let me know!) (...) (22 years ago, 3-Dec-03, to lugnet.robotics.rcx.nqc, lugnet.robotics.spybotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) Symmetry is when something 'balances', it's a kind of equilibrium. Let's look at a six legged walker for a moment and see what sort of symmetry it has. First off we have six legs and many of them (at least three in the right location) must (...) (22 years ago, 3-Dec-03, to lugnet.robotics)
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| | Strange BrickOS Timing
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Hello out there, maybe someone can explain to me why the current brickOS release seems to have msleep()-amnesia ;-) We've been testing the data transfer to our Lepomux device. For some strange reason we were still using kernel 0.2.6.07nmChg with a (...) (22 years ago, 2-Dec-03, to lugnet.robotics.rcx.legos)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) hard. (...) About 15 years ago - in the days before RCX - I built a 6-legged walker that used "ackerman" steering on the front legs. Power to the front legs went through the kingpins. (I think "kingpin" is called something different in US (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: GP2D12 Please help
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Hi Sebastian, (...) I don't know the schematics of that sensor interface, but I think it's basically a bad idea to drive a device that needs 30 to 50 mA from a powersource that can only output about 10 mA. I've experienced similar effects while (...) (22 years ago, 2-Dec-03, to lugnet.robotics.rcx.legos)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) Done. -- -- Open Forge, LLC 24/365 Onsite Support for PCs, Networks, & Game Consoles 512-695-4126 (Austin, Tx.) help@open-forge.com irc.open-forge.com Hangar 18 Open Source Distributed Computing Using Plan 9 & Linux 512-451-7087 (URL) (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) Please do. Thanks, Kevin (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) Please do. Thanks, Kevin (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) I agree. (...) Sorry, I made -no- statement about your Qaud242. Build it however you like. You expanded the scope of my comment from general legged walker design to something specific, where it wasn't intended to go. I was talking strictly (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: NQC's future
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(...) I am happy to help out as best I can. Unfortunately, there is little chance that I will do as good a job as Dave Baum has done over the years. But I'll try my best. (...) Yes. When I can find the time. I'm also trying to find the time to do a (...) (22 years ago, 2-Dec-03, to lugnet.robotics.rcx.nqc, lugnet.robotics.spybotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) I've never been lost, I always know where I'm at if I'm awake. Right here. May not know where other things are in relation but, hey, the sun rises in the E. and sets in the W. everywhere; and I know how to read stars. :) (...) I'm often lost, (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) I guess we're talking different things here. You were telling me to use all three motor/sensors. I claim I only need two for my Quad242. I have to see WWW to know what you are talking about I guess, or else you lost me. Static balance requires (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been donebefore/etc?
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(...) Doug Carlson has working examples: (URL) (...) I understand it. (...) Kevin (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) Well I was restricting the discussion to modifying my Quad242. I think you are talking about something else. I think you were proposing using all three inputs and outputs to run the motors and control switches. I was proposing using less of (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | RE: an idea, can someone tell me if this is possible/been donebefore/etc?
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<SNIP> (...) Look up Tri-Star Wheel. Instead of driving wheels, drive gears that move legs (or pneumatic pumps). Remember that a Tri-Star Wheel uses a differential. When the input shaft is turned, it spins the body of the differential which turns (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) Bad assumption but it would work, the RCX is too limited on I/O to be doing that sort of stuff except in the case of simple rollers/walker. Since legs have symmetry it's silly not to take advantage of it here, you've got to use it to keep the (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) Nope, it's actually pretty easy. Sel-Syn. It's been used on naval ships to control guns since sometime in the mid-1800's. -- -- Open Forge, LLC 24/365 Onsite Support for PCs, Networks, & Game Consoles 512-695-4126 (Austin, Tx.) (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) A man after my own heart ;) It seems to be the way nature works too, start simple only add complexity when a energy capture issue arises and forces an adaptive response. Most adaptions are neutral, despite the dribble they teach all the way up (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: Broken Mindstorms motors
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(...) Call "LEGO Shop at Home" and get four replacement motors. I just called them about a broken motor and a broken "pneumatic double acting cylinder". I called them pistons, but when she finally found them in 8455, she made sure I knew they were (...) (22 years ago, 2-Dec-03, to lugnet.robotics.rcx)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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That's "scene analysis", not "seen analysis". I knew I had a typo like that, but could not find it. ----- Original Message ----- From: "Gordon Elliott" <gelliott@csisc.cc> To: <lego-robotics@crynwr.com> Sent: Tuesday, December 02, 2003 2:21 PM (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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Earlier, Jim Choate said: (...) I think it is important to understand both simplicity and complexity here. For example a fluidic (e.g. pneumatic) cylinders have the potential for redistribution between cylinders of load force. This is equivalent to (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) When driving I'm sometimes not where I want to be but am rarely lost. When lost I have no problem asking directions :^) When it comes time to make complicated robots out of LEGO I'm often lost and don't like to ask directions! I know this post (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) What if we assume that each output drives a motor, through a differential which drives a pneumatic switch and a compressor. The compressor does not care which rotational direction it is driven, but the switch does. When we are mostly up to (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) I gotta see the movie to really appreciate what you'd like to see. (...) The foot on the obstacle is not in the air but on the ground. If you mean that one foot is on the obstacle and the other can't reach the ground, I see your point. I was (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) One of my design goals when making robots is to not use the RCX unless it is needed. I program computers and debug hardware all day at work, so I can write NQC programs in my sleep. For me it is much more of a challenge (and therefore more (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: Search algorithms
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(...) A* works just fine under legOS. I haven't tried it in NQC, where I'd expect to have some minor issues with the list management. - Alex (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: NQC's future
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In lugnet.robotics.rcx.nqc, John Hansen wrote: John, thanks for taking on the maintenance and improvement of NQC. (...) I'd definitely like to see this one implemented, when you can find the time. :-) Mark (22 years ago, 2-Dec-03, to lugnet.robotics.rcx.nqc, lugnet.robotics.spybotics)
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| | NQC's future
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I'm very interested in hearing from NQC users what their needs/wishes are for future enhancements. Here's my current list of updates/enhancements that I am working on. 1. Built-in and documented Spybot API. 2. Fast firmware download via USB tower (...) (22 years ago, 2-Dec-03, to lugnet.robotics.rcx.nqc, lugnet.robotics.spybotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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On "complexity", I would point out that the computational power of the neural pathways of the house fly thoroughly exceeds the computational throughput of our most massive supercomputer clusters at the moment. True "adaptation" would require (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) Just checked, yep. Not counting this one I sent three responses to -your- request for input on your project. -ALL- of them went to the list. Me thinks he protest too much. -- -- Open Forge, LLC 24/365 Onsite Support for PCs, Networks, & Game (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) Nothing, you asked a question and I explained the situation. (...) I have no interest in your mental state. (...) I've actually sent you nothing I didn't CC to the group as far as I'm aware. (...) -technical- toys. (...) You asked a question, (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Broken Mindstorms motors
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We have several broken mindstorms motors. Tw got the shafts broken. Two just stopped turning. So, we decided to steal the shafts from one set to fix the other set. However, putting them back together has stopped the working but shaftless ones from (...) (22 years ago, 2-Dec-03, to lugnet.robotics.rcx)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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i'm sorry to all about using this forum to resolve private issues but i have to say one word to jim what is going on with you? if you want to get me down - do it here on the group!!! send you really smart and wise posts on the group!!! if you want (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) Use a watchdog timer instead, if you want to stop don't send any outputs. Once the timer trips the bot stops. You still get your third sensor, you'll need it for a bump switch, otherwise you won't know when to turn/back-up. Each output is (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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"Kevin L. Clague" <kevin_clague@yahoo.com> wrote in message news:Hp9qnp.Cn6@lugnet.com... (...) i know what you mean but i thought about walking through obstacles in fact walking over obstacles because we were talking about WWW and the spider from (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) Ahh, yes. Not walking is an important part of the behavior :^) I'll probably have the third output control a pole reversor switch. Battery power -> pole reversor -> RC racer motor (or two?) -> pumps. I want a powerful compressor. (...) Kevin (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) That's not what I meant! Silly fingers. I can't suggest Ilya's book strongly enough. This guy 'got it'. -- -- Open Forge, LLC 24/365 Onsite Support for PCs, Networks, & Game Consoles 512-695-4126 (Austin, Tx.) help@open-forge.com (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) Much lighter than 1 RCX per leg !!! (...) I guess the third output should control the Walk/Don't Walk function, perhaps directly driving compressor motor? Philo (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) My Quad242 has the ability to walk forward and backward, as well as turn right or left. Currently pneumatic switches, acting as pneumatic polarity reversors, need to be manually flipped to change from behavior to behavior. These behavior (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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"Kevin L. Clague" <kevin_clague@yahoo.com> wrote in message news:Hp8uqD.8yM@lugnet.com... (...) but pneumatics gives you just automation you dont have "adaptation" i can imagine sensor-like pneumatic valve configuration but it would be much more (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Search algorithms
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Has anyone tried A* or D* on an RCX Lester Witter (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: Robotex2003 Winner: Lego
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I found some picture from the event. It has been really hard to find any information at all. All pictures: (...) (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) I'd recommend pneumatics instead of large number of RCX's. Kevin (22 years ago, 2-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) Yes (...) Not really, if you start with a hexapod and break the legs down into two groups of three (you get stability that way) you should be able to do it with two outputs (one for start/stop the other for for/rev). As an aside, and a rather (...) (22 years ago, 1-Dec-03, to lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) That's one approach, probably the wrong one considering the limitations of the RCX. Instead of trying to solve your problems with the RCX why not take the approach of the original; pullies, gears, differentials, gear trains, etc. As I made (...) (22 years ago, 1-Dec-03, to lugnet.robotics)
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| | Re: failure in communicaton between RCX & IR Tower
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Nathan, I have done this trouble shooting step, ie. changing the timing. Unfortunately, it did not work. But, thank you though. Well, the a W2Kpro virtual machine approach did not work either... I guess my only alternative will be getting the (...) (22 years ago, 1-Dec-03, to lugnet.robotics.rcx.robolab)
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| | Re: Pneumatic Quadraped 242
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(...) snip (...) I started working on articulated head and tail. Quad242 has a very large footprint, and walks inefficiently. One of the reasons for large feet is center of gravity. The center of gravity on Quad242 is just a little behind the center (...) (22 years ago, 1-Dec-03, to lugnet.technic, lugnet.build, lugnet.robotics, FTX)
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| | Re: New LEGOTIC Hand
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(...) Even more impressive now than the prototype I saw some time ago... Very clever use of Bionicle parts, would be a winner if a "Technic lame parts" contest was organized! XP to lugnet.robotics Philo (22 years ago, 1-Dec-03, to lugnet.technic, lugnet.robotics)
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| | Re: an idea, can someone tell me if this is possible/been done before/etc?
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(...) Plenty of people have build eight legged walkers - that's not all that hard. However, the machine in WWW is supposedly very flexible and could climb near vertical cliff-faces, etc. You'd need at least two or three motors per leg to get that (...) (22 years ago, 1-Dec-03, to lugnet.robotics)
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| | an idea, can someone tell me if this is possible/been done before/etc?
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Or, provide suggestions on how to do it? I saw Wild Wild West the other day and was looking at the giant spider robot and wondered if making such a "sipder" robot is possible with lego robotics? Would it be possible? Has anyone done it? Does anyone (...) (22 years ago, 1-Dec-03, to lugnet.robotics)
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| | Re: Opening COM port error
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(...) Tyler, Happy to be of help! Regarding Garbage Collection, I'm not usually one to criticise without being able to suggest a better alternative. In this case, I think most GC systems could be improved by mimicking the concept of "smart pointers" (...) (22 years ago, 30-Nov-03, to lugnet.robotics.rcx.java, lugnet.off-topic.geek)
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| | Re: "Non-Robolab" LabView functions
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(...) Disagree. It's a matter of habitudes. Once you're familiar with the whole environment, you may write extremely complex programs without getting lost. For example, in our recent "Mars-mission" telerobotics project the complete programming -the (...) (22 years ago, 30-Nov-03, to lugnet.robotics.rcx.robolab)
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| | Re: Robolab, byte codes and assembler
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(...) They do work! But they are usually used with two quadrature outputs (hence the name), while on RCX only one wire is used and the 4 states are encoded as 4 voltages levels. (URL) (Image courtesy Michael Gasperi) The sequence (clockwise) is (...) (22 years ago, 30-Nov-03, to lugnet.robotics, lugnet.robotics.rcx.robolab, FTX)
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| | Re: Robolab, byte codes and assembler
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(...) The way I understand it, it's really not the sensor's fault. The RCX and firmware together either can't or doesn't deal with the ambiguous voltage levels sometimes returned during two of the four transitions. If the RCX were fast enough that (...) (22 years ago, 30-Nov-03, to lugnet.robotics, lugnet.robotics.rcx.robolab)
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| | Re: Robolab, byte codes and assembler
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Could someone explain to me technically why this sort of of problem with the rotation sensor occurs? I know how quadrature shaft encoders are _supposed_ to work, and I can't see why this sort of thing should happen in the first place. >> Mark (22 years ago, 30-Nov-03, to lugnet.robotics, lugnet.robotics.rcx.robolab)
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| | Re: "Non-Robolab" LabView functions
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(...) Still waiting to hear from Dick about that. (...) I disagree that it's easier to understand and use. Possibly easier to learn or figure out without documentation, up to a point. But ease of learning is not the same as ease of use. Graphical (...) (22 years ago, 30-Nov-03, to lugnet.robotics.rcx.robolab)
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| | Building a RCX™-compatible temperature sensor
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An easy one, that has already be done numerous times... anyway, here is my implementation of a fully RCX-compatible temperature sensor, that provides correct values when used with standard RCX temperature routines. (2 URLs) RCX-compatible (...) (22 years ago, 30-Nov-03, to lugnet.robotics, FTX)
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| | Re: "Non-Robolab" LabView functions
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(...) ---...--->snip I've not had the time yet to analyze the patch. Seems that you replace the first firmware handler. In Robolab the firmware is found under ..ROBOLAB\Engine\RCX1\Text. They simply have changed the extension .lgo to .txt and call (...) (22 years ago, 30-Nov-03, to lugnet.robotics.rcx.robolab)
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| | WTF: Broken RCX units
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Anyone have or know where I can find broken RCX units for parts? Thanks, Rand (22 years ago, 30-Nov-03, to lugnet.robotics.rcx)
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| | Re: Opening COM port error
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In lugnet.robotics.rcx.java, Chris Phillips wrote: Hahaha, Your passionate condemnation of GC makes entertaining reading in light of the amount of work I have to do with lejos,Java,C++, etc for my final year undergraduate project. I will certainly (...) (22 years ago, 30-Nov-03, to lugnet.robotics.rcx.java)
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| | Re: Patched firmware to improve rotation sensor, was Re: Robolab, byte codes and assembler
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(...) It took me some time to figure out why, but you are right, the ambiguous transitions occur only while counting up. What you could do though would be to count +1 while going from state3 to state2_ambiguous, and correct "phantom transition" by (...) (22 years ago, 30-Nov-03, to lugnet.robotics, lugnet.robotics.rcx.robolab)
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| | math library
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Hello all. About a year ago I researched math functions so I could write some for the RCX. I found some power series functions that work really well. I see another message here posted by "nanobapt" has also posted some functions so I tested his (...) (22 years ago, 29-Nov-03, to lugnet.robotics.rcx.legos)
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| | "Non-Robolab" LabView functions
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I've been experimenting with some of the LabView icons available in "Investigator" mode in Robolab (under the "hourglass" item on the outermost menu). They seem to cause some odd behavior sometimes. It seems like it's especially a problem if one of (...) (22 years ago, 30-Nov-03, to lugnet.robotics.rcx.robolab)
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| | Re: Patched firmware to improve rotation sensor, was Re: Robolab, byte codes and assembler
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(...) Doesn't that mean that at any given count, you could still be off by 1, but now the odds of having an incorrect count are 50-50 instead of about one in 500? (...) There has been some discussion about whether this patch will work with Robolab, (...) (22 years ago, 30-Nov-03, to lugnet.robotics, lugnet.robotics.rcx.robolab)
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| | Re: Patched firmware to improve rotation sensor, was Re: Robolab, byte codes and assembler
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(...) If FIRST doesn't allow NQC - I can't see it allowing patched RCX firmware. ---...--- Steve Baker ---...--- HomeEmail: <sjbaker1@airmail.net> WorkEmail: <sjbaker@link.com> HomePage : (URL) : (4 URLs) GEEK CODE BLOCK----- GCS d-- s:+ a+ C++++$ (...) (22 years ago, 30-Nov-03, to lugnet.robotics)
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| | Re: Patched firmware to improve rotation sensor, was Re: Robolab, byte codes and assembler
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"Philippe Hurbain" <philohome@free.fr> wrote in message news:Hp4JAs.oK8@lugnet.com... (...) Much to my embarassment, I have to agree with Philippe that the patch doesn't work very well. I try to figure out what went wrong. (...) This is the expected (...) (22 years ago, 29-Nov-03, to lugnet.robotics, lugnet.robotics.rcx.robolab)
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