 | | Re: single motor pneumatic pump and switch
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Nice idea. I don't have pneumatics yet, but the same idea can be applied to different applications. For example, I want to build a arm with a grabber that first closes the "hand" then lifts the arm. I believe your idea using the differential will (...) (25 years ago, 25-Oct-00, to lugnet.robotics)
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| | RE: LEGO 2001
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(...) Ahhhh, the lure of numbers :-) (...) Agreed. I know about a half dozen kids that have these sets, and most of them would rather watch TV! Don't forget that a lot of these kits are in schools. They are dumped on teachers that have little or no (...) (25 years ago, 25-Oct-00, to lugnet.robotics, lugnet.robotics.rcx.pbforth)
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| | RE: NQC with C++ header file
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Curiosity piqued, I took a look around Google and found (among others)..... (URL) haven't waded through the math manually yet, but this doesn't look too awful. Perhaps I am ignorantly naive. It sure would be neat to have sin and cos on demand. Jeff (...) (25 years ago, 25-Oct-00, to lugnet.robotics)
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| | RE: LEGO 2001
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Jeffrey Hazen (11:58 AM 10.25.2000) wrote: >The scans are interesting, but I'm afraid there isn't much excitement >robotics-wise. > >An interesting note: The serial number on one of the RCX bricks in the >scans is 502273. The earliest serial number (...) (25 years ago, 25-Oct-00, to lugnet.robotics)
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| | RE: LEGO 2001
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>Jeff wrote: > >That means (with some assumptions about completeness) Lego has banged out >over half a million of these yellow bricks.... Really? Even one tenth that number is still a sea of yellow bricks! So where is everybody? Why are there only (...) (25 years ago, 25-Oct-00, to lugnet.robotics)
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| | RE: LEGO 2001
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The scans are interesting, but I'm afraid there isn't much excitement robotics-wise. An interesting note: The serial number on one of the RCX bricks in the scans is 502273. The earliest serial number I can find is in my RCX 1.0 Constructopedia: (...) (25 years ago, 25-Oct-00, to lugnet.robotics)
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| | Floating Point Arithmetic (Re: NQC with C++ header file)
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Speaking of FP, leJOS supports floating point arithmetic, and it now has a java.lang.Math class with pow, sqrt, sin, cos, tan and atan. Brian Bagnall is working on atan2, asin, acos, etc. It's getting more and more complete. We're currently (...) (25 years ago, 25-Oct-00, to lugnet.robotics)
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| | RE: NQC with C++ header file
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(...) Well, not exactly. I guess I should elaborate. These rations are commonly used for scaling results. Of course if you do the division in integer you get 3, but what if you had an intermediate result that was 32 bits long. That's how Forth (...) (25 years ago, 25-Oct-00, to lugnet.robotics)
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| | RE: NQC with C++ header file
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Absolutely! You'd be amazed at what can be done with 16 bit integer arithmetic if you operate at some suitable scale factor, depending upon the requirements - x10, x100, x16, x256. It depends on the ease with which you can shift and/or divide. As (...) (25 years ago, 25-Oct-00, to lugnet.robotics)
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| | RE: NQC with C++ header file
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(...) Bah! We don't need no stinkin floating point. Here are a few approximations to real and transcendental numbers that you can make by dividing signed integers - the error is gennerally less that 1 in 1,000,000 pi 355 /113 sqrt(2) 19601 / 13860 e (...) (25 years ago, 25-Oct-00, to lugnet.robotics)
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| | Re: MacNQC 2.2a3 compatibility with NQC2.2r2
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(...) Do you mean Event()? I think it is defined in MacNQC 2.2a3, but there's a nasty bug in it that was only recently fixed at NQC 2.2r2. Its possible to define your own version of Event() (named something different of course) if you need to use (...) (25 years ago, 25-Oct-00, to lugnet.robotics)
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| | Re: NQC with C++ header file
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(...) What specifically do you have in mind? The limitation is going to be from the firmware bytecodes...no floating point, no transcendentals, no math larger than 16 bits. Switching over to legOS would give you floating point, but still no (...) (25 years ago, 25-Oct-00, to lugnet.robotics)
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| | Re: NQC versus Lego RCX Code Speed
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In article (...) Sorry for the delay...I haven't been keeping up with lugnet.robotics as much as I should. NQC generates the same sort of bytecodes that RCX Code does, so they are both at the same "level" (specifically bytecodes executed by an (...) (25 years ago, 25-Oct-00, to lugnet.robotics)
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| | R: Rechargable batteries
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I've use rechargable batteries (NiMh - Nickel Hydrade - , 1,2V) with the cybermaster with no problems at all. 9V (not rechargable) in the tower. The only difference is the motors are a little slower... The NiMh I used were rated for 1400ma so even (...) (25 years ago, 23-Oct-00, to lugnet.robotics)
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| | Sv: Lego Mindstorms at EXPO2000
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It looks like the robots are cooking? Did they offer a taste? Great pictures! I did not know of a Lego stand at EXPO, it looks great. EXPO is open until October 31st. I considered going - now I have to. On a side note, TRU in Denmark has CyberMaster (...) (25 years ago, 22-Oct-00, to lugnet.robotics)
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| | Re: single motor pneumatic pump and switch
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I think the key is that the differential has a lot less resisitance than the white slip gear. Your idea would work, but if I understand you, the slip gear would be slipping the whole time the pump is pumping, meaning the motor has to overcome the (...) (25 years ago, 24-Oct-00, to lugnet.robotics)
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| | Re: single motor pneumatic pump and switch
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Does this mechanism actually need the differential? If you used a 24 tooth crown (the horrible bendy one) on the motor and this turned the white slip gear for the switch and also a standard 24 tooth for the pump, the diff isn't needed, or is it just (...) (25 years ago, 24-Oct-00, to lugnet.robotics)
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| | Re: Announce: October NRB Meeting
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(...) Wish I could come, but we have a Legofest planned for The Construction Site at 3 - that would be too much driving. Regrets, -Tim (25 years ago, 24-Oct-00, to lugnet.robotics)
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| | Re: single motor pneumatic pump and switch
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Yes we do... but that's why we play with LEGO(R) too : ) "John Barnes" <lego-robotics@crynwr.com> wrote in message news:4.2.0.58.200010...lserver... (...) (25 years ago, 24-Oct-00, to lugnet.robotics)
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| | Announce: October NRB Meeting
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When: October 28th @ 1:00PM Where Nashua Public Library, Nashua, NH Directions and Info see: (URL) - Bylaws (see attachment) - Trinity Fire Fighting Robot Contest Qualifying contest in Jan. Presentation: - Skye Sweeney will be presenting "Micro Air (...) (25 years ago, 24-Oct-00, to lugnet.robotics)
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