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 | | Re: The largest LEGO box is?
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| (...) I measure (roughly) the 6991 box to be: 25 1/4" x 18 1/2" x 4 1/4". Only one dimension larger than the 3290, and much smaller in terms of volume. (...) Indeed! John C. (25 years ago, 25-May-99, to lugnet.general)
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dimension
(score: 1.712)
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| | dual servos
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| Hello everyone, I have been fiddling with my dual servo routines and I have gotten things running to the point that I now need a chassis for my project. While working on the drive system I have noticed that when under heavy motor load (2 motors at (...) (28 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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wall
(score: 1.712)
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| | Re: The largest LEGO box is?
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| (...) I don't have 7740 in a box so can't say. But 6991 is massive. At least mine are. Could there be two versions of the packaging? I compared one of my unopened 6991s to my unopened 6339 airport shuttle and my newly arrived 6990 box. All (...) (25 years ago, 29-May-99, to lugnet.general)
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dimension
(score: 1.711)
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| | Re: IR collision avoidance
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| (...) ** My only question is how do you keep the bot at a constant 18 inches ** away from the wall with a collision detection algorithm? Is it ** possible to get analog outputs from a sensor indicating the ** distance from a wall? Or is there is (...) (28 years ago, 27-Feb-97, to lugnet.robotics.handyboard)
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wall
(score: 1.711)
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| | Re: IR collision avoidance
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| Some comments and a few questions for Chris (...) We have "forward" and 45 degrees right". We wall hug to the right while you hug to the left. We ignore IR to left and use only the left contact switch for collisions (rare). (...) We had way too much (...) (28 years ago, 25-Feb-97, to lugnet.robotics.handyboard)
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wall
(score: 1.711)
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| | Re: IR collision avoidance
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| This question seems to come up a lot here so I thought I'd post to the list rather than reply individually. Here's what I'm doing for IR collision avoidance. First, the hardware: I'm using 3 Radio Shack IR LED's in parallel and 3 Radio Shack IR (...) (28 years ago, 24-Feb-97, to lugnet.robotics.handyboard)
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wall
(score: 1.711)
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| | Re: IR collision avoidance
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| (...) Good question! We had a lot of noise problems and learning curve stumbles along the way. Our first bad news was that we had a range of a few inches. We finally beat that one fooling with frequencies, caps, etc. and then found out our range was (...) (28 years ago, 27-Feb-97, to lugnet.robotics.handyboard)
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wall
(score: 1.711)
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| | Re: Motor Sensor (fwd)
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| (...) Exerpted from the appendix of my college physics book: :-) Standard Representations for Newtonian Kinematic Quantities 1) Linear forms Position (x) -- units from a fixed origin in one dimension Velocity (v) -- time rate of change of linear (...) (25 years ago, 9-Jun-99, to lugnet.robotics)
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dimension
(score: 1.709)
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| | Re: IR collision avoidance
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| Riachard, Could you please explain to me how the IR emitter angled at 45 degrees is able to pick up its beem. I'm unsure of the IR emmission dynamics. Wouldn't an IR angled perpidicular to the wall being travelled along suffice as the only sensor? (...) (28 years ago, 2-Mar-97, to lugnet.robotics.handyboard)
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wall
(score: 1.709)
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| | Re: IR collision avoidance
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| (...) Someone could probably give some very good reasons why 45 degrees is a good choice. For me it was common sense and experiment. Less than 45 degrees from ahead and the angle the IR is hitting the wall is too "shallow" and I don't get a return. (...) (28 years ago, 5-Mar-97, to lugnet.robotics.handyboard)
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wall
(score: 1.709)
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| | Re: IR Collision avoidance
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| Well, at risk of being branded a heretic, since you've brought up the issue of modulated IR, I'm going to throw out an observation I've made about the Radio Shack IR sensors which several other people on the mailing list have privately disagreed (...) (28 years ago, 3-Mar-97, to lugnet.robotics.handyboard)
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wall
(score: 1.709)
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| | Cruise Ship at Lego Store
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| After the Hoth display was done, I've been asked if I also do other themes besides Star Wars. The conversation led to building a cruise ship where I've agreed to do it on the store premises using the Pick-A-Brick wall at my discretion. The build (...) (17 years ago, 23-Mar-08, to lugnet.town, lugnet.build, lugnet.announce.moc, FTX) !
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brick, wall
(score: 1.706)
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| | Re: Idea: How starting to work for a unique Lego piece naming convention?
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| (...) Ok, I could go with: 1x2 45 degree slope, half pyramid Here's an attempt at the rest of the more or less normal slope parts: 1x2 45 degree slope 2x2 45 degree slope 3x2 45 degree slope (3) ... 1x2 45 degree slope, peak 2x2 45 degree slope, (...) (25 years ago, 8-Jul-99, to lugnet.admin.database, lugnet.cad, lugnet.cad.dev, lugnet.db.inv, lugnet.general)
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dimension
(score: 1.705)
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| | Re: IR for bots
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| (...) If you don't modulate the signal you run the risk of having another 40kHz signal (a.k.a. remoth control) trigger the reciever. If you modulate it and look only for you modulation code, then the chances of a stray signal are minimal. I have (...) (28 years ago, 28-Mar-97, to lugnet.robotics.handyboard)
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wall
(score: 1.705)
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| | Re: Interfacing handyboard with Basic Stamp2
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| Hi, You can use the SPI interface and have the BS2 as a master. The BS2 then defines the clockspeed, because the slowest speed you can select on the 6811 is probably to high for the BS2. It is very simple to use this interface. See the "pink book" (...) (25 years ago, 27-Jul-99, to lugnet.robotics.handyboard)
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measurement
(score: 1.703)
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| | Re: Distance Sensor
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| (...) By far the easiest solution is to buy one or more rotation ("angle"?) sensors from Lego. I overpaid for mine, but I've heard that you can get these for about $17 US from Lego Shop at Home. (Sorry, I don't have the URL handy...) These sensors (...) (25 years ago, 31-Jul-99, to lugnet.robotics)
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measurement
(score: 1.702)
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| | Re:
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| (...) yup, it was too short! (...) Phil, couple of questions for clarity. Does it need to go up and down the steps or just up? does it carry stuff? Why is step climbing needed? It might be easier to make a wall climbing bot...or a bot that can leap (...) (28 years ago, 11-Apr-97, to lugnet.robotics.handyboard)
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wall
(score: 1.702)
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dimension
(score: 1.702)
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| | Bots on TV - Nice IR app
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| So, I saw the Scientific American show on PBS and I was completelly geeked! It was too short. I was most impressed by the tennis ball capturing contest and by Newton Lab's Vision Car entry. Cognachrome is very cool. After seeing the show I logged on (...) (28 years ago, 11-Apr-97, to lugnet.robotics.handyboard)
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wall
(score: 1.702)
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| | (no subject)
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| Hi, fellow (ro)Botters! Did anyone watch Scientific American Frontiers on Wednesday? If not, or even if you did see it, check out www.pbs.org . PLEASE SEE IT! there's a lot of good links, a complete transcript, and other goodies. But now, onto my (...) (28 years ago, 11-Apr-97, to lugnet.robotics.handyboard)
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wall
(score: 1.702)
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