 | | Re: roboball
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(...) Hi Elizabeth, The red LED serves only as an on/off indicator. And, as it only functions when the battery is fully charged, it is not a very good one. The rest of the LED's are infrared and invisible to the naked eye. One way to "see" the light (...) (21 years ago, 13-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | roboball
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Hi, I got a roboball and wished to test it out for my group of kids to do a soccer game. When I first received it, one light bulb was lit. I tested it with the lego light sensor, but no reading. Then I connected it to a 9v . Unfortunately, now, the (...) (21 years ago, 13-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: Blocking SetUserDisplay?
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(...) In C you would declare a as volatile. Jürgen (21 years ago, 11-Jun-05, to lugnet.robotics.rcx.nqc)
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| | NQC release 3.1r2
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I have released NQC version 3.1r2. The only change from 3.1r1 is a fix to the Spybot FindWorld API function. (URL) Hansen (21 years ago, 10-Jun-05, to lugnet.robotics.rcx.nqc)
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| | Re: Real-world interfacing to RCX: LEDs and magnetic sensor
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(...) The motor outputs give a square wave of 1/8 up to 8/8 of a cycle. You can use a counter running at 8x the cycle frequency to measure how many eighths the output is giving, and light an LED accordingly. For the magnetic sensor, I suggest (...) (21 years ago, 9-Jun-05, to lugnet.robotics.rcx, FTX)
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| | Problem with LDT plugin
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Hi, I'm starting with lejos and I try to use the plugin LDT 1.2.0 for Eclipse 3.0 with Windows XP. When I try to run (Run As > leJOS), I get the message : An internal error occurred during: "Launching". java.lang.IllegalArg...Exception: Path must (...) (21 years ago, 8-Jun-05, to lugnet.robotics.rcx.java, FTX)
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| | Re: navigation and communication
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(...) We have worked with a big chart with black crosses on a white wooden surface. This works pretty well, since with the reflection of the light of the LED, black and white can be easily recognised. Then the ambient light has not a big influence. (...) (21 years ago, 8-Jun-05, to lugnet.robotics.rcx.legos)
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| | rcx programming and flash
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Hello, once time, i've found a site about an api waht can control rcx by flash interface. but i dont find anymore this site thx a lot (21 years ago, 8-Jun-05, to lugnet.robotics.rcx)
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| | Real-world interfacing to RCX: LEDs and magnetic sensor
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I would like to be able to drive one or two banks of 7-8 LEDs off of the motor ports on the RCX. I know that there is a winker board that senses the motor level to determine what pattern to display. Can this be accomplished otherwise? I also want to (...) (21 years ago, 7-Jun-05, to lugnet.robotics.rcx)
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| | BricxCC release news
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I continue to work on getting BricxCC ready for a new official release. My sincere apologies for not having one out at the beginning of the year as I had originally planned. Life keeps getting in the way. In any case, I have a new update to BricxCC (...) (21 years ago, 6-Jun-05, to lugnet.robotics.rcx.nqc)
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| | Re: Blocking SetUserDisplay?
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(...) Neither of these work, although the second one does introduce a temporary for everything except for the 0 part. It will result in the display sometimes showing a value of zero. NQC tries really hard to use as few variables as it can so you (...) (21 years ago, 5-Jun-05, to lugnet.robotics.rcx.nqc)
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| | Re: Blocking SetUserDisplay?
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(...) Thanks for the ideas! Actually these yielded some interesting results: a = 0 + ((x * 100) + y); occasionally yielded 0 (as expected), but never yielded anything other than 0 and the correct value (that I saw). a = ((x * 100) + y); and a = (x * (...) (21 years ago, 5-Jun-05, to lugnet.robotics.rcx.nqc)
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| | Re: Blocking SetUserDisplay?
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(...) You may be able to work around this by using parenthesis (untested). a = ((x * 100) + y); or you might try a = 0 + ((x * 100) + y); John Hansen (URL) (21 years ago, 5-Jun-05, to lugnet.robotics.rcx.nqc)
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| | Re: Blocking SetUserDisplay?
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(...) That's the only way around it as far as I know. JB (21 years ago, 4-Jun-05, to lugnet.robotics.rcx.nqc)
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| | Blocking SetUserDisplay?
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I have a program with a setup routine for calibrating light sensors. During the setup routine, it does: SetUserDisplay (a, 2); Then in a loop, reads the values of 2 light sensors into x & y, averages the readings and then does: a = x * 100 + y; to (...) (21 years ago, 4-Jun-05, to lugnet.robotics.rcx.nqc)
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| | Re: position calculating for robots
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(...) There are various geometries have been implemented in Lego bricks for this. Here is one example: (URL) searching Google for "Lego adder subtractor" for others. (21 years ago, 2-Jun-05, to lugnet.robotics.rcx.legos)
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| | Re: advice for robogrip
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(...) Do you mean robot hands? If so, try the one from my robot: (URL) It's actuated with pneumatics at the moment but the two 24mm pulleys have bevel gears linking them, to keep the fingers synchronised, so you could use a motor and low gearing to (...) (21 years ago, 27-May-05, to lugnet.robotics.rcx, lugnet.robotics.edu, FTX)
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| | advice for robogrip
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Hi, I am trying to look for a few lego end effectors configuration. I got the one from CMU's robotics educator. Suggestion will be greatly appreciated. --thanks (21 years ago, 26-May-05, to lugnet.robotics.rcx, lugnet.robotics.edu)
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| | Re: position calculating for robots
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(...) From something I read 12 years ago for my university project (a Lego robot of course, but pre-RCX), I think it required differential equations (ugh!). Probably a bit too memory-hungry for an RCX. Perhaps you could use the PC's computing power (...) (21 years ago, 26-May-05, to lugnet.robotics.rcx.legos)
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| | position calculating for robots
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Thanks Thomas for your idea. The matter is that I was thinking of using angle sensors in order to calculate the number of the turns that each wheel has driven (I am talking for a robot with 2 wheels). I think that some advanced maths are required (...) (21 years ago, 26-May-05, to lugnet.robotics.rcx.legos)
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