 | | 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 (...) (19 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 (...) (19 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. (...) (19 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 (19 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 (...) (19 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 (...) (19 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 (...) (19 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 * (...) (19 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) (19 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 (19 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 (...) (19 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. (19 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 (...) (19 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 (19 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 (...) (19 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 (...) (19 years ago, 26-May-05, to lugnet.robotics.rcx.legos)
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| | Re: navigation and communication
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(...) In theory you can find position by having a 'giant pantone chart' on the floor - a sheet of paper like the test pad with coloured squares on it, and use the light sensor to detect which square the robot is on. Has anyone tried this? It will be (...) (19 years ago, 25-May-05, to lugnet.robotics.rcx.legos)
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| | navigation and communication
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Thank you Nathan. I think your link is really gonna help! Now do you know of any way making the robot calculating its position constatly? You see i want to make the robot send its position to another one so it can go there. Thank you again for your (...) (19 years ago, 24-May-05, to lugnet.robotics.rcx.legos)
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| | Re: New NQC API for RCX-Spybot or RCX-RC communication
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(...) John, I have a few beginner questions for you. I am trying to emulate the infrared protocol on a different microcontroller. I want it to be able to be controlled by a Lego remote and to send/receive messages to Lego devices. What format does (...) (19 years ago, 21-May-05, to lugnet.robotics, lugnet.robotics.rcx, lugnet.robotics.rcx.nqc, lugnet.robotics.spybotics)
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| | Re: Group project: RCX units run emergence simulation
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(...) I like the ants idea. What you could have is a "home base" or somewhere the RCX's can return to (some simple sensor based thing), and then a feeding area. In between you have any number of obstacles. The RCX's draw, or follow lines left by (...) (19 years ago, 24-May-05, to lugnet.events.brickfest, lugnet.robotics.rcx)
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