 | | Re: The Future of Trains
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In lugnet.lego, Scott Wardlaw wrote: <snip> (...) <snip> Has anyone adapted two NXT units to drive a train yet? One NXT as a controller talks bluetooth to the other NXT that drives the train. The NXT that drives the train could be either attached to (...) (17 years ago, 5-Oct-07, to lugnet.lego, lugnet.robotics.nxt)
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| | eZCIRCUITS #2 Is Available
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Hi All, I've just posted another eZCIRCUITS to my blog (URL). This application will show how to build a Bumper Sensor-Switch with the help of the LEGO NXT for mobile robots and mechatronics platforms. Enjoy!!! Don W. (17 years ago, 22-Sep-07, to lugnet.robotics.nxt)
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| | Re: New pbLua Beta13o - Now with FLASH Writing!
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(...) Hi Ralph, WOW, great work!!! It works perfectly... Some additional notes and documentation about storing Lua programs at flash memory is available at: (URL) for your excellent support Christian (17 years ago, 20-Sep-07, to lugnet.robotics.nxt)
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| | Re: Any Good Fan Instructions Using Only One NXT Set?
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(...) Thanks Matthias. That's just the kind of thread I was looking for. -Paul (17 years ago, 20-Sep-07, to lugnet.robotics.nxt)
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| | Re: Any Good Fan Instructions Using Only One NXT Set?
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(...) Yes, this helps a lot. I'll definitely check out your book when it comes out. Thanks! -Paul (17 years ago, 20-Sep-07, to lugnet.robotics.nxt)
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| | Re: NXT's in Series
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(...) Here's one way: Use NXC or NBC. Pair a secondary NXT to a the primary NXT on connection 1 using the menu system on the primary NXT. Control the outputs on the secondary NXT using RemoteSetOutputState in a program running on the primary NXT. (...) (17 years ago, 19-Sep-07, to lugnet.technic, lugnet.robotics.nxt)
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| | Re: Any Good Fan Instructions Using Only One NXT Set?
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Paul, have a look here: (URL) Matthias Zitat von "Paul S. D'Urbano" <durbano@optonline.net>: (...) ---...--- This message was sent using IMP, the Internet Messaging Program. (17 years ago, 19-Sep-07, to lugnet.robotics.nxt)
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| | Re: Any Good Fan Instructions Using Only One NXT Set?
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(...) Hi Paul, This website has some free building instructions for robots that can be built from the pieces in one NXT set: (URL) new book has some building instructions for robots that can also be built from the pieces in one NXT set: (URL) my new (...) (17 years ago, 19-Sep-07, to lugnet.robotics.nxt)
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| | RE: step-by-step tutorial leJOS and Eclipse
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(...) I tried it and it was painless. I made a typo in entering the "Path" field which took a while to figure out; otherwise it worked like a charm. Overall score: very good / satisfied. Please don't take the following as criticism -- you asked for (...) (17 years ago, 19-Sep-07, to lugnet.robotics.nxt)
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| | Any Good Fan Instructions Using Only One NXT Set?
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Any good books or fansites out there with instructions for neat stuff you can make with just the parts in one Mindstorms NXT set? Thanks! (17 years ago, 19-Sep-07, to lugnet.robotics.nxt)
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| | Re: step-by-step tutorial leJOS and Eclipse
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Christoph, That's great! I've posted an according entry to THE NXT STEP blog: (URL) Matthias Zitat von Christoph Bartneck <christoph@bartneck.de>: (...) ---...--- This message was sent using IMP, the Internet Messaging Program. (17 years ago, 18-Sep-07, to lugnet.robotics.nxt)
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| | step-by-step tutorial leJOS and Eclipse
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Hello, We created step-by-step instructions on how to install and run Java on your LEGO Mindstorms NXT using leJOS and Eclipse: (URL) hope that his is helpful to you and maybe you can even report back possible improvements. Enjoy, Christoph (17 years ago, 18-Sep-07, to lugnet.robotics.nxt)
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| | Re: First Impressions: LDD 2.0 and building with Technic elements from NXT.
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(...) Granted, meshing gears is awful. You have to place the gears on axles with space between them, rotate one with hinge tool until they could match, then move the rotated gear and axle in meshing position. And trying to modify a gear ration in an (...) (17 years ago, 16-Sep-07, to lugnet.cad.ldd, lugnet.robotics.nxt)
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| | Re: New pbLua Beta13o - Now with FLASH Writing!
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(...) Normally we should start our 2007/2008 robot projects this Fall. PbLua definitely is on the list of being tested. (17 years ago, 13-Sep-07, to lugnet.robotics.nxt)
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| | Re: New pbLua Beta13o - Now with FLASH Writing!
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(...) Claude, thanks for the encouragement. I remember exchanging notes with you on pbForth, and I'll bet your students are as bright as ever. If you have a spare NXT and a motivated student it would be really interesting to see what they think :-) (...) (17 years ago, 12-Sep-07, to lugnet.robotics.nxt)
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| | Re: New pbLua Beta13o - Now with FLASH Writing!
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(...) Way cool ! Exciting ! (17 years ago, 12-Sep-07, to lugnet.robotics.nxt)
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| | New pbLua Beta13o - Now with FLASH Writing!
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All of you that have been helping to test pbLua.... I have released another Beta of pbLua - and it's got FLASH writing (and reading) goodness in it. (URL) It does not yet have the ability to boot from a string in FLASH but it's very close. The (...) (17 years ago, 12-Sep-07, to lugnet.robotics.nxt)
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| | Re: Ultrasonic Sensor iS "Slow"
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(...) The 15 ms that John reported is the time it takes for a sound pulse to travel 500 mm, the round trip distance at the maximum advertised range of the US sensor. An interesting coincidence? Roger Glassey (17 years ago, 11-Sep-07, to lugnet.robotics.nxt)
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| | Ultrasonic Sensor iS "Slow"
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Original Thread title was "Re: Ooops! NXT Software Comparison correction / I2C Messaging Speed". I've renamed as worth a separate thread. (...) You're right!! If you poll the sensor too fast, it definitely reports wrong distances. I'm doing some (...) (17 years ago, 7-Sep-07, to lugnet.robotics.nxt)
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| | RE: NXT-G/ROBOTC Firmware Scheduler and Clump Priority
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Holy cow! This is fun to read... I wish I have the time to further discuss this regarding the events handling with nxt. Follow up later. Thanks for such detailed info. --Elizabeth -----Original Message----- From: news-gateway@lugnet.com (...) (17 years ago, 7-Sep-07, to lugnet.robotics.nxt)
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| | RE: Ooops! NXT Software Comparison correction / I2C Messaging Speed
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(...) I want to list both. First, the one-to-one mapping, and second (with some explanation) the code with a second task. Several other pieces of software have an "optimized" version of code, and it makes sense to do the same for NBC. Steve (17 years ago, 6-Sep-07, to lugnet.robotics.nxt)
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| | Re: NXT-G/ROBOTC Firmware Scheduler and Clump Priority
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Wow! Very interesting posting. Thanks for revealing that, Dick! Zitat von Dick Swan <dickswan@sbcglobal.net>: (...) ---...--- This message was sent using IMP, the Internet Messaging Program. (17 years ago, 6-Sep-07, to lugnet.robotics.nxt)
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| | NXT-G/ROBOTC Firmware Scheduler and Clump Priority
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In a typical operating system (OS), tasks are scheduled on a priority basis. The highest priority task always executes ahead of lower priority tasks. If there are multiple tasks at the highest priority, then they are typically executed in a round (...) (17 years ago, 6-Sep-07, to lugnet.robotics.nxt)
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| | RE: Ooops! NXT Software Comparison correction
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(...) After tuning, NBC achieved 73K test cycles. It achieved these great results by setting the task "priority" to 200. Unfortunately, unless the NXT-G task scheduler has been rewritten, these results might be a little too high. A NXT-G task (or (...) (17 years ago, 6-Sep-07, to lugnet.robotics.nxt)
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| | RE: Ooops! NXT Software Comparison correction / I2C Messaging Speed
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(...) Nobody cheated or is dishonest. Everyone who writes firmware for the NXT is well-intentioned "good" people. Let's not mislabel good modern programming practice -- i.e. hardware device drivers integrated into the low-level firmware -- as (...) (17 years ago, 6-Sep-07, to lugnet.robotics.nxt)
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| | Re: Ooops! NXT Software Comparison correction / I2C Messaging Speed
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(...) I think I understand. In this case, the limiting factor is the US sensor itself, how fast it can ing and interprete a return. Or from my standpoint (a physicist), it's a fundemental limitation of the physics of sound, not a limitation that has (...) (17 years ago, 5-Sep-07, to lugnet.robotics.nxt)
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| | Re: Ooops! NXT Software Comparison correction / I2C Messaging Speed
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(...) The errors that occur are that the sensor does not properly report variable distances as it is positioned at varying distances from an obstacle. If you slow down the read rate then it works correctly (i.e., with a wait of ~15 ms between read (...) (17 years ago, 5-Sep-07, to lugnet.robotics.nxt)
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| | Re: pbLua GUI ???
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(...) I forgot the screenshot ;-) (URL) me: which of the connected NXTs is real ? One of this NXTs is software only (pbLuaAPI). Bye Christian (17 years ago, 5-Sep-07, to lugnet.robotics.nxt)
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| | Re: pbLua GUI ???
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(...) New Eclipse version EUROPA (3.3) with LuaEclipse, RSE Target Management, RXTX and pbLuaAPI works excellent with pbLua ! You have direct access to all serial connected NXTs (Bluetooth and USB) from the Eclipse Workbench. A perfect professional (...) (17 years ago, 5-Sep-07, to lugnet.robotics.nxt)
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| | Re: Ooops! NXT Software Comparison correction / I2C Messaging Speed
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Hi Dick, (...) actually I2C runs at something close to 12kHz in the LEGO firmware (I forgot the exact value). Jürgen (17 years ago, 5-Sep-07, to lugnet.robotics.nxt)
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| | Electronics Prototyping with the LEGO NXT
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Hi Folks, I've been exploring various ways to use the LEGO NXT in enhancing electronics through Robotics and I've just posted a short video on the subject matter at my blog (URL). I'll be writing an eZCIRCUITs application note on the construction (...) (17 years ago, 5-Sep-07, to lugnet.robotics.nxt)
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| | RE: Ooops! NXT Software Comparison correction / I2C Messaging Speed
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(...) I wasn't aware of this firmware limitation. I could not duplicate it when using the ROBOTC firmware. I've done three different test runs of 500K messages each with perfect results each time. Each test run used a different sensor. The delay (...) (17 years ago, 5-Sep-07, to lugnet.robotics.nxt)
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| | leJOS NXJ 0.4.0 is Released
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NXJ version 0.4.0 now includes a full suite of graphical widgets in the java.microedition.lcdui package, a multi-level menu system, wireless NXT to NXT communications using Bluetooth, primitive wav file sound support, and many more enhancements. (...) (17 years ago, 5-Sep-07, to lugnet.robotics.nxt)
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| | Re: pbLua GUI ???
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(...) This is starting to look pretty promising as a standard IDE. I will do my part and install Eclipse here and get the instructions updated from Christian's instructions. Once we get a decent IDE the pbLua system may be almost ready for "everyone (...) (17 years ago, 3-Sep-07, to lugnet.robotics.nxt)
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| | Re: pbLua GUI ???
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(...) ;-) currently I'm extending Eclipse with simple terminalprogram and pbLuaAPI... With pbLuaAPI-Wrapper(maps pbLua nxt.* to native Lua routines) you can test and run pbLua code at local PC before transfering to NXT... Christian (17 years ago, 3-Sep-07, to lugnet.robotics.nxt)
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| | Re: pbLua GUI ???
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Zitat von Christian Mock <chrimo-@-moccy.xdsnet.de>: (...) pbLua/NXT support there is rather sparse, isn't? Matthias "why don't I do that myself, though?" ---...--- This message was sent using IMP, the Internet Messaging Program. (17 years ago, 3-Sep-07, to lugnet.robotics.nxt)
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| | Re: Ooops! NXT Software Comparison correction
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I can further manipulate the numbers for this timing test by using the enhanced standard firmware's support for adjusting a thread's priority. Here's the results when I tweak priorities: W/O LCD LCD Priorities ---...--- 50617 22608 40/5 63211 27375 (...) (17 years ago, 2-Sep-07, to lugnet.robotics.nxt)
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| | Re: Ooops! NXT Software Comparison correction
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(...) So if I cheat I can move the I2C transaction out of the actual timing loop (which may be what some other folks are doing, effectively) then with a "read" of the Ultrasonic sensor value in the loop and all sensors and motors attached I get (...) (17 years ago, 2-Sep-07, to lugnet.robotics.nxt)
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| | Re: Ooops! NXT Software Comparison correction
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(...) Nearly all of the speed test numbers on Steve's page are wrong. That's because Steve's loop boils down to "how fast can you reliably read the LEGO Ultrasonic Sensor". You can't reliably read a value from that device faster than about once (...) (17 years ago, 2-Sep-07, to lugnet.robotics.nxt)
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| | Ooops! NXT Software Comparison correction
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My bad. When I fiddled with the pbLua code I forgot to turn on the motors and neglected to change the Motor A speed. So when you ran the program, the motors didn't move. I also had uploaded the wrong version to my web site of the version that shows (...) (17 years ago, 1-Sep-07, to lugnet.robotics.nxt)
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