 | | Re: Light sensor initialization?
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Matthew's program takes one reading at initialization time to determine a baseline value. Any reading that falls 7 units below this is assumed to be a dark line. I take a somewhat more conservative approach, taking 10 readings over one second and (...) (27 years ago, 15-Jul-99, to lugnet.robotics.rcx)
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| | Re: Light sensor initialization?
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(...) [snip] (...) Yes -- check out my RoboTag program at (URL) RoboTag, the sensor is pointing at the ground, which is probably grey/brown/white, with black border lines. My program reads the light level at start, and assumes that it isn't on a (...) (27 years ago, 14-Jul-99, to lugnet.robotics.rcx)
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| | Re: Light sensor initialization?
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I haven't done that yet. But if you're doing a line follower, I would suggest the following: 1. First, build the line follower in such a way that it can rotate in place and make the light sensor sweep out a circle on the ground as it rotates. 2. (...) (27 years ago, 13-Jul-99, to lugnet.robotics.rcx)
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| | Lots of new FAQ answers and some revisions
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I have just sumbitted a large number of answers to FAQ questions that hadn't been answered yet, and revisions to other answers. There is also just one answer that I did not change (-: The answers are in the lugnet.faq newsgroup. Here is an index to (...) (27 years ago, 13-Jul-99, to lugnet.robotics.rcx, lugnet.faq)
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| | Light sensor initialization?
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This should be an FAQ at this point, but I'm having trouble tracking down an answer in the LUGNET archives. I'd like my 'bot to measure ambient light levels, and make light/gray/dark decisions based on those levels. For instance, Dave Baum's line (...) (27 years ago, 13-Jul-99, to lugnet.robotics.rcx)
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| | Re: Help with 9738 LEGO Mindstorms Remote Control
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(...) Robolab uses the same firmware as Mindstorms RIS, so the remote should work fine. Same goes for NQC. (...) You can write programs in NQC (also in RCX Code or Robolab) that respond to IR Messages. These messages can be sent from another RCX, (...) (27 years ago, 13-Jul-99, to lugnet.robotics.rcx)
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| | Re: Help with 9738 LEGO Mindstorms Remote Control
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Dave's reply is right on the mark, but I also want to point out that if you have downloaded a non-MindStorms O.S. to the RCX (i.e. any firmware other than the standard LEGO MindStorms firmware) the remote might not work either. I haven't tried any (...) (27 years ago, 12-Jul-99, to lugnet.robotics.rcx)
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| | RE: VERY [OT] Feathers 'n Lead...
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(...) Sorry for the extra quoting here, but the thread was a bit old...and just for everyone's info, both bags have the SAME mass, so they have the same first moment of inertia....I think. The shape of the object generally affects the SECOND momemnt (...) (27 years ago, 12-Jul-99, to lugnet.robotics.rcx)
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| | Re: VERY [OT] Feathers 'n Lead...
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(...) I think the original poster was putting his tongue firmly in cheek there. BTW, the dropping of objects would be a second experimental proof that gravity affects all objects equally regardless of weight. Best test being in a vacuum where you (...) (27 years ago, 12-Jul-99, to lugnet.robotics.rcx)
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| | Re: [OT] Feathers 'n Lead...
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(...) being (...) as (...) MORE (...) the dropping of the objects on the moon was to prove that when 2 objects are dropped from the same height in an environment with little or no friction they will hit the ground at the same time. both bags weigh (...) (27 years ago, 12-Jul-99, to lugnet.robotics.rcx)
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| | Re: Help with 9738 LEGO Mindstorms Remote Control
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I just got one myself and it seems to work fine. The A, B, and C buttons turn on the motors (in either direction) as long as they are held. You can even hold multiple buttons down to turn more than one motor at the same time. The Message buttons (1, (...) (27 years ago, 11-Jul-99, to lugnet.robotics.rcx)
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| | Help with 9738 LEGO Mindstorms Remote Control
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Hi, Purchased the 9738 LEGO Mindstorms remote control and it doesn't seem to do anything. Has anyone else used one of these? It's my expectation that the remote allows the RCX to be controlled directly with out the program interface. Is that not (...) (27 years ago, 11-Jul-99, to lugnet.robotics.rcx)
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| | Re: JVM port status
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(...) Wow, looks like this is really off to a strong start! When/if you're ready for a dedicated mailing list/group, let me know if there's any way I can help out. The .robotics.rcx group is perfectly fine too, if you'd like to use that, although it (...) (27 years ago, 7-Jul-99, to lugnet.robotics.rcx)
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| | [OT] Feathers 'n Lead...
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(...) I think so too. I remember seeing some footage of a feather and a hammer? being dropped by an astronaut on the moon's surface. They both hit the ground at the same time, which proves to mee that even a single feather is as heavy as a hammer, (...) (27 years ago, 2-Jul-99, to lugnet.robotics.rcx)
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| | Windows file mirroring
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OK, I've now mirrored the two (apparently) necessary files for LegOS under windows at this URL: (URL) those of you in the US, this should provide a faster download of Gavin's stuff (though not necessarily by much, since Gavin's site is surprisingly (...) (27 years ago, 29-Jun-99, to lugnet.robotics.rcx)
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| | FW: Alternate C compiler for LegOS
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Luis, here's a forwarded message with the links to Gavin's executables. You need to download the latest Cygwin distribution too, from (URL) (...) Alternatively, have a look at (URL) I've done a similar but lazier job of just providing an add-on lump (...) (27 years ago, 28-Jun-99, to lugnet.robotics.rcx)
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| | 3in1 Car #8286 as RCX AddOn?
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Hi all. This is a bit OT, but has some relevance for people getting ONE MORE KIT to round out their RCX... LEGO S@H Canada has the 8286 3in1 car on sale for $90CDN With taxes and everything, that works out to about $70 US! This set has 726 peces (...) (27 years ago, 28-Jun-99, to lugnet.robotics.rcx, lugnet.build)
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| | Re: RCX Tower Internals
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(...) I'm pretty sure the echo is not direct, it goes out through the emitters and back into the receiver. This is demonstrated by varying the lighting conditions and/or the baud rate and noting the response. If the echo were direct, you'd receive (...) (27 years ago, 10-Jun-99, to lugnet.robotics.rcx)
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| | RE: RCX Tower Internals
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Kekoa wrote... (...) This might be a really simpleminded circuit. As far as I can tell there are a pair of 132's (simple HC logic chips) - one for each direction. They implement direct echo back, which implies that the channel is really only half (...) (27 years ago, 10-Jun-99, to lugnet.robotics.rcx)
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| | Re: RCX Tower Internals
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Kekoa Proudfoot <kekoa@pixel.Stanford.EDU> wrote in message news:FCzorK.Gyn@lugnet.com... (...) (URL) and compare to see if they look similarly. For me at least, the emitters (...) By the way.. Kekoa, I've looked at your page.. And I've discovered (...) (27 years ago, 8-Jun-99, to lugnet.robotics.rcx)
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