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hi Chris, (...) That's in fact a good principle. Isn't it possible to improve the dynamic range of the light-sensor by taping the red LED, I read that somewhere but I don't know where. Why not use a continuous grayscale, with pure with and black (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Curved Feet
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Your comment about the wheels is the main annoyance of the inflexibility I mentioned. Re beams: Heh, I had several of the old Expert Builder Sets so I had an overload of beams. I've been buying lots of parts trying to bring up my inventory of more (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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Hello, (...) What is Lego made out of? ==> ABS plastic What can you buy in sheets with the same thickness as Lego? ==> ABS plastic So what I would do if I were you is go to a modelbuilder's supplier and ask for a sheet of ABS of 1.5 (?) mm thick. (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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(...) Yah, but if I'm gonna build my own sensors, there's a lot I could do. I'm sort of a purist. I'm trying to stick with the stock sensors so that most people can build a copy of my system. Printing out something on a printer and gluing it to (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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(...) You could build a rotation sensor found on Michael Gaspari's site, using a magnetic strip. It is supposed to give 40 or so counts per revolution. Andy (...) -- See my Visual Interface for leJOS at (URL) (24 years ago, 13-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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(...) I thought about something like that, but using 2 wheels and 2 touch sensors, not just one, and using my 2 bit encoding system like on the light sensor wheel. But I'm not sure how to build small round things out of Lego that have 36 divisions (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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(...) The light sensor just doesn't have that kind of resolution. I'd never get a very accurate position by doing that, I wanted a finer positioning system than I can get from using a rotation sensor. I'm trying to build something that's got (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Internet Controlled Robots
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(...) Try this: (URL) (24 years ago, 12-Apr-01, to lugnet.robotics.rcx.robolab, lugnet.robotics.edu, lugnet.robotics)
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| | Re: Struggling with encoder wheel
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(...) Hey, that was a great idea! I couldn't use ?/: to do it (NQC doesn't know those operators), had to actually write out all the if/else, but I actually just added it into my wheel generation program, so it printed out the function for me and I (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | RE: two RC servo motor interface to the RCX
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(...) Try: (URL) It requires pbForth, but you can build the servo encoder with only a few basic parts, not mocrocontroller! Cheers, Ralph (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Battery Tests
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The Unibots tested a bunch of different batteries in preparation for the Northern California State FLL tournament last December, without a doubt the Energizer e2 Lithium batteries (the kind in a blue package) outperformed all others, lasting through (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | two RC servo motor interface to the RCX
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Hi All, the idea to control two RC servo motors via the RCX was a new challange to me and now, after finding a solution, (see www.inchlab.com) i'd like to know if some one else also figured out a diferent solution to this problem? Let me know... (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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Chris, This idea would require an additional motor, but, an alternate approach might be to create your wheel with 36 alternating grey and white (perhaps by having a third or fouth shade/color you could have more information) segments. Then, in each (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Internet Controlled Robots
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I am wanting to begin experimenting with web based control of the RCX using RoboLAB 2.0 but have not been able to find any information. Can anyone kindly lead to some resources? I have only the knowledge that this can be done, nothing else. (24 years ago, 12-Apr-01, to lugnet.robotics.rcx.robolab, lugnet.robotics.edu, lugnet.robotics)
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| | Re: 2.0 Firmware
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(...) The DLL path is the directory that the *.dll files are located (dll standing for Dynamic Linked Library). You probably unzipped all the files into one directory. If this is the case then all the paths should be to that directory. Make sure (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Amiga Software
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(...) ... in the US. It was HUGE in Europe, esp. UK and Germany. -Simon (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: 2.0 Firmware
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In article <GBn3FD.Cw5@lugnet.com>, Dean Hystad <dean.hystad@mts.com> writes (...) What and where would the 'DLL' path be?? (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Problems with the scout
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I downloaded the program from RCX Command Centre to my scout. I then pressed run, but it didn't run the program. It wasn't to big because it was it was only 'On(OUT_A);'. Does anybody know what to do? TNX (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Pneumatic Pump Testing Goes Hi Tech
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(...) My answear to that is of course unprintable (although it starts with 'P' and ends with 'off') :-) ha ha ha... Steve (24 years ago, 12-Apr-01, to lugnet.robotics, lugnet.technic)
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| | Re: Struggling with encoder wheel
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(...) I was wondering how you were handling the edge conditions. Have you tried making a wheel which is a continuous gradiant from black to white over the 360 degrees of rotation? Lookup wouldn't be required as there would be a direct relationship (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Looking for orthogonal motion
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Hi David, I have built a robot that does this for a university 'robot maze solver' project. My solution is big, ugly, very slow and pretty complex. It could probably be improved a lot if it was redesigned. However, it uses 3 motors (1 for (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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(...) You could make a big wheel made of lego plates, and put smooth ones on top for 'colors'. Then you could use a touch sensor, and use the difference between the low spots and the high spots as 1 location. Do you really need to know the direction (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Looking for orthogonal motion
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Hi David, we had the same problem and solved it not using your raising-lowering idea (we also thought about it ;-) ) but we build a synchrodrive. Have a look at it if interested. (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Motor with Gear Reduction ??!??
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Found it! (URL) technical specs and then select Motor. -Rahul (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Motor with Gear Reduction ??!??
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Found it! (URL) technical specs and then select Motor. -Rahul (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Motor with Gear Reduction ??!??
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Hi, I could not find the link but as far as I remember there was an information page about the sensors and motors and solar panels on pitsco ( or something else ?) site. I am unable to find the same. The pages had all the technical characteristics (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Looking for orthogonal motion
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Hi all, I haven't been able to find anything on the net about a Lego implementation of an orthogonal drive system using only motors (i.e. no pnumatics). Orthogonal is when your your chassis can go straight forward and back, and also side to side, (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Battery Tests
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I really cant make any comparison to batteries, ever since day one I've used Rayovac Rechargeable Alkalines. I bought two 4 packs for.. $6 each? and the recharger that only charges 4 at a time for another $8? I forget, bought it all around the (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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(...) Can't you just use a large switch() statement inside a function to simulate a 64 element array? If none of the values in the array ever change: int array ( int x ) { switch ( x ) { case 0 : return element_0 ; case 1 : return element_1 ; case 2 (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Struggling with encoder wheel
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(...) If I had room for a 64 element array, I'd just use that and make a lookup table. Unfortunately I don't, and I can't figure out a way to pack things in and still look them up with any speed. I also can't find any way to mathematically convert (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Pneumatic Pump Testing Goes Hi Tech
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(...) Thanks for the information. I'm going to see if I can get hold of one of these... (...) I use pneumatics mainly where brute strength is needed rather than smooth motion, such as the raising/lowering mechanism on a crane (although this (...) (24 years ago, 12-Apr-01, to lugnet.robotics, lugnet.technic)
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| | Re: Struggling with encoder wheel
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Pretty neat Chris. You've very nearly recreated a special kind of optical encoder that was developed by my former employers called a virtual absolute encoder. It didn't use diferent colors but it used a "time-window" to read the last few states off (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Motor with Gear Reduction ??!??
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(...) Depends on when and to whom you ask the question. The ungeared motor was "standard" for a long time, and has only been gradually outshadowed by the geared motor since 1998. (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Motor with Gear Reduction ??!??
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(...) the (...) Try this page: "(URL) couldn't fit it in one line so some copy&paste should be used. (Looking at the table, though, I think 60 rpm is too slow for the new geared motor) - David (24 years ago, 12-Apr-01, to lugnet.robotics, lugnet.technic)
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| | Re: Pneumatic Pump Testing Goes Hi Tech
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(...) Thanks for the identification of the tire pressure gauge. I reckon the stores will soon be doing a brisk trade in them. But I would hesitate to use the word *calibrate* - the pressure sensor is a far more delicate device than the tire gauge. (...) (24 years ago, 12-Apr-01, to lugnet.robotics, lugnet.technic, lugnet.build, lugnet.dacta)
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| | Re: Pneumatic Pump Testing Goes Hi Tech
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(...) Methinks it'll be muscle wire or air muscle or something akin... Well, if you don't need the pneumatics any more, how about "donating" them to me :-) (24 years ago, 12-Apr-01, to lugnet.robotics, lugnet.technic)
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| | Re: Motor with Gear Reduction ??!??
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Does anybody know (or can anybody point me to) the ratio of speeds between the geared and ungeared motor? -s (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: Motor with Gear Reduction ??!??
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isn't that the standard motor?? Shaun Sullivan schrieb: (...) (24 years ago, 11-Apr-01, to lugnet.robotics)
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| | Re: Amiga Software
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I don't know if an Amiga port of NQC has already been done, but if not it shouldn't be very difficult. Grab the sources from (URL) only real "porting" is access to the serial port, which is abstracted in a single class. If the Amiga has POSIX style (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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| | Re: robotica on TLC
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(...) Heh, Glad you found it useful! (...) Hmmm...I wonder how many Lego enthusiasts are also combat robot enthusiasts:) (...) Sounds like you really know you Lego Technic, I thought you might only be using them to illustrate ideas. BTW, do you have (...) (24 years ago, 11-Apr-01, to lugnet.robotics)
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