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(...) pbLua supports communication over the RS485(?) port. That's sensor port 4. Using that port, you can connect several NXTs together. You just need a cable that connects to several ports. Steve (17 years ago, 18-Sep-07, to lugnet.robotics)
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| | Re: NXT's in Series
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I suspect that with the proper software (and maybe a special cable), the I2C protocol can be used to network between NXT controllers. I2C is a multi master bus with collision detection, so it "should" work. It's just a SMOP [Small Matter of (...) (17 years ago, 18-Sep-07, to lugnet.robotics)
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| | Re: Serenity, an autonomous NXT-based boat
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(...) It's a good thought - in fact, my first attempt was to use the front treaded "flippers" on LNE/Packbot so that Packbot could drive onto a "floatation frame", and either power or deploy its own "water tread" propulsion. That idea fell afoul of (...) (17 years ago, 17-Sep-07, to lugnet.robotics)
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| | Re: NXT's in Series
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[Cross-posted to lugnet.robotics as it's on-topic there] (...) There's no absolutely transparent way to make a program running on one NXT address the sensor or motor ports of a 2nd (or 3rd, or 4th) NXT. However, a lot of solutions to this problem (...) (17 years ago, 17-Sep-07, to lugnet.technic, lugnet.robotics)
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| | Re: Serenity, an autonomous NXT-based boat
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Not that I've tried it (of course) but it seems that if were to use the treads with small paddles attached, it would push the splashing part to the rear, give skid steering, and sill provide good propulsion, similar to the corkscrew idea. Chain (...) (17 years ago, 17-Sep-07, to lugnet.robotics)
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| | Re: Serenity, an autonomous NXT-based boat
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(...) Oars are nothing but highly asymmetric paddle wheels. Yes, I know, that's a bit simplified, but still splashes a lot unless you have the high amount of control over force curves, blade angle, etc. that an experienced rower has. Just check out (...) (17 years ago, 15-Sep-07, to lugnet.robotics)
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| | Re: Serenity, an autonomous NXT-based boat
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(...) Oars! (17 years ago, 15-Sep-07, to lugnet.robotics)
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| | Re: Serenity, an autonomous NXT-based boat
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(...) never had (...) gears (...) turned (...) A Thai style Long-tailed-boat may be easier to build and would keep the motor out of the water. No rudder - just rotate the engine. Peter (17 years ago, 14-Sep-07, to lugnet.robotics)
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| | Re: Serenity, an autonomous NXT-based boat
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Zitat von Brian Davis <brdavis@iusb.edu>: (...) Sails. The motors used to trim them according to the direction and strength of the wind. ---...--- This message was sent using IMP, the Internet Messaging Program. (17 years ago, 14-Sep-07, to lugnet.robotics)
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| | Re: Serenity, an autonomous NXT-based boat
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OK - Since you beat me to that one how about magnetohydrodynamic propulsion (thought that might be hard with stock Lego :) Or more realistically, how about counter-rotating screw drives, like this one: (URL) be able to make something like it by (...) (17 years ago, 14-Sep-07, to lugnet.robotics)
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| | Re: Serenity, an autonomous NXT-based boat
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(...) Airboat? Though I don't know if you could drive a large enough prop fast enough to move you... -Rob A> (17 years ago, 14-Sep-07, to lugnet.robotics)
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| | Re: Serenity, an autonomous NXT-based boat
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(...) Good idea, and I should have added that to the list. But a high-thrust LEGO air propeller or fan seems to be even tougher to make than a water propeller. There's been a lot of discussion in the past about LEGO hovercraft, but it's rather hard (...) (17 years ago, 14-Sep-07, to lugnet.robotics)
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| | RE: Serenity, an autonomous NXT-based boat
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(...) I consider the ZNAP flex axles "not good enough" to be put to good use. Another useful item from the ZNAP collection, however, are the wheels. They have a turbine-like shape and from what I remember from past testing in the kitchen sink, they (...) (17 years ago, 13-Sep-07, to lugnet.robotics)
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| | Re: Serenity, an autonomous NXT-based boat
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(...) Airboat! (17 years ago, 13-Sep-07, to lugnet.robotics)
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| | Re: Serenity, an autonomous NXT-based boat
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(...) Those are a good all-LEGO solution... but they tend to splash. A lot. This isn't fatal, but means either "splash shielding" the electronics (which requires more weight), or making the entire robot bigger (so the splashing wheels aren't close (...) (17 years ago, 13-Sep-07, to lugnet.robotics)
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| | Re: Serenity, an autonomous NXT-based boat
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(...) I'd love to see more people try this. It's a little bit risky (usually, when my programming skills fail the robot doesn't end up stranding in the middle of a lake... or worse, on the bottom), but it brings up a whole new range of problems and (...) (17 years ago, 13-Sep-07, to lugnet.robotics)
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| | Re: Serenity, an autonomous NXT-based boat
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(...) If you're talking about the Outdoor Challenger (8675) ( (URL) ) then, yes, he has one of those... Steve (17 years ago, 13-Sep-07, to lugnet.robotics)
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| | Re: Serenity, an autonomous NXT-based boat
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(...) You know, what I like most with your project is that is such a refreshing, new challenge, which - as you pointed out- surprisingly few people though of yet. So, this might become a completely exciting NXT robot section. I think it was in 2005 (...) (17 years ago, 13-Sep-07, to lugnet.robotics)
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| | Re: Serenity, an autonomous NXT-based boat
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(...) What about paddle wheels? Tim (17 years ago, 13-Sep-07, to lugnet.robotics)
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| | Re: Serenity, an autonomous NXT-based boat
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(...) Actually, I haven't thought of that - at least partially because I've never had those axles. But I would think that a vertical axle driving meshed crown gears to drive the horizontal propellor axle, or even an inclined axle that is turned (...) (17 years ago, 13-Sep-07, to lugnet.robotics)
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