 | | 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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