 | | Re: Walkers
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I don't know much about mechanics or walkers, but what about a gyro device that's more stable than a rotational sensor. Surely someone out there would know how to use one of these to "balance" a walker. Of course this means powering the gyro to spin (...) (24 years ago, 13-Feb-01, to lugnet.robotics)
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| | Re: Rope Climbing and Can Crushing at BrickBots.Com
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(...) [SNIP] (...) Good idea, but the rules specify that the robot can not start with a store of human provided potential energy (Aside from the batteries in the RCX if you want to be technical). The large weight waiting to drop would be a bunch of (...) (24 years ago, 13-Feb-01, to lugnet.robotics)
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| | Re: Rope Climbing and Can Crushing at BrickBots.Com
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(...) I don't have the time to work on this, but I see a relatively simple way to do this that might work well. Build a column to stack all 3 cans into. Place 3 "spikes" roughly dead center at each can, the RCX powers a bar that moves the spikes in (...) (24 years ago, 13-Feb-01, to lugnet.robotics)
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| | Re: Rope Climbing and Can Crushing at BrickBots.Com
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Hi There, Hmm, you found the loophole! Okay, the rules have been changed to indicate that all cans must be crushed at least 50%. This should prevent the instant win, but still keep the formula as it was. The updated formula is a good one, but since (...) (24 years ago, 13-Feb-01, to lugnet.robotics)
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| | Re: Building a computer from Lego's
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Sorry if this one has been suggested: (URL) have seen two others, but searches came up empty and didn't someone post a brick sorter that read in a sequence of 1x2 tiles to produce an "order" to be "picked" from hoppers of different colour? Couldn't (...) (24 years ago, 13-Feb-01, to lugnet.robotics, lugnet.general)
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| | Oops! Darn diode/fuse
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So while trying to modify my brick to accept 9v from an AC adapter, I managed to blow the SMT diode/fuse. Anyone know the rating (or part #) of the fuse/diode so I can replace it? While I'm at it, anyone know what voltage/mA the RCX can take as (...) (24 years ago, 13-Feb-01, to lugnet.robotics)
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| | Re: Rope Climbing and Can Crushing at BrickBots.Com
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(...) I'd better submit my model (which is one 2x1 plate and nothing else) it scores 2 points...and may yet win if nobody succeeds in crushing a can and everyone needs more than an RIS set to attempt it! (24 years ago, 13-Feb-01, to lugnet.robotics)
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| | Re: A dream Mindstorms/Technic piece...
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(...) Indeed :-) Perhaps you missed the post I made earlier in this thread (I think it was only on lugnet.technic at that point) where I posted the URL for my compressor device using this battery box? Here it is anyway: (URL) amusement park ride (...) (24 years ago, 13-Feb-01, to lugnet.robotics)
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| | Block & Tackle Mechanisms
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I have added a "Block & Tackle" based LEGO device to my site at (URL) Check it out. Block & Tackle is a formal mechanism, as much as a wedge or lever or gear. It has some amazing benefits. But it's hard to work it into a design and some of its (...) (24 years ago, 13-Feb-01, to lugnet.robotics)
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| | Re: Rope Climbing and Can Crushing at BrickBots.Com
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Doesn't a machine that does nothing score perfectly? If so, my entry is an RCX sitting next to three cans. It finishes the instant it starts. You have a formula time * height * bonus = score, with small being better. So a robot that does no crushing (...) (24 years ago, 13-Feb-01, to lugnet.robotics)
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| | RE: A dream Mindstorms/Technic piece...
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The Mindstorms touch sensor isn't a switch, but a sensor. You need an RCX or MicroScout to read it's status. It is not suited for directly switching a load like a motor. It can only carry a very small current, and still has a lot of resistance when (...) (24 years ago, 12-Feb-01, to lugnet.robotics)
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| | Rope Climbing and Can Crushing at BrickBots.Com
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Hello All, On Friday February 9th, 2001 the Rope Climbing Contest at BrickBots.Com finished with three completed entries and one standout winner! The contest objective was to build a LEGO robot to go up and down a length of rope as quickly as (...) (24 years ago, 12-Feb-01, to lugnet.robotics)
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| | Re: A dream Mindstorms/Technic piece...
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Jennifer Clark <jen@vulture.dmem.strath.ac.uk> wrote in message news:3A87CF43.4C05B6...h.ac.uk... (...) the (...) a (...) some (...) battery (...) One possibility may be to use a Mindstorms touch sensor to switch it on/off. This would remove the (...) (24 years ago, 12-Feb-01, to lugnet.technic, lugnet.robotics)
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| | Re: OmniRemote Update part II (brief)
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(...) Unfortunately, I have no RCX as of yet - been too busy buying car parts. however, I don't think he's worried about firmware right now, and more worried about just sending basic messages back and forth. Firmware comes later, and I suspect it (...) (24 years ago, 12-Feb-01, to lugnet.robotics)
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| | leJOS article in JavaWorld
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Enjoy! (URL) (24 years ago, 12-Feb-01, to lugnet.robotics, lugnet.robotics.rcx.java)
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| | Re: What kind of plastic?
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PVC pipe cement is the easiest kind of glue to get hold of for gluing Lego bricks. It is "VERY" effective. Use a tooth pick to apply it - you don't need much! As far as axles and other axle related parts, they are made of something quite different - (...) (24 years ago, 12-Feb-01, to lugnet.robotics)
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| | Re: A dream Mindstorms/Technic piece...
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(...) I'm sure it is possible, as the switch on it is also spring loaded and has a "motor on but switch not locked in place" setting. You'll still have to do some lego modification by soldering at least one other cable directly to the battery (...) (24 years ago, 12-Feb-01, to lugnet.technic, lugnet.robotics)
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| | Re: Is an RCX Output Amplfier, possible ?
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(...) Actually, you need four transistors in what is called an H-bridge configuration. This is due to the fact that the motors are usually intended for bi-directional use. If you are only using them in one direction, a single transitor will suffice. (...) (24 years ago, 12-Feb-01, to lugnet.robotics)
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| | POPTRONICS isn't worth it
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For those of you who have seen the March 2001 issue of Poptronics (the "Special Robotics Issue") and been attracted by the words "Lego Mindstorms" in bold type one the cover - believe me, it isn't worth it. In the finest traditions of Popular (...) (24 years ago, 12-Feb-01, to lugnet.robotics)
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| | Re: Walkers
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Thanks for the feedback people. I asked the question because I have been working on a walker for around 6 weeks, and was getting a bit discouraged. I have since had some success on the weekend. My walker will now go through it's complete walking (...) (24 years ago, 12-Feb-01, to lugnet.robotics)
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