 | | Drive R/C Servos with the RCX and pbForth (long)
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Hi again everyone! A few days ago I announced that I had developed a nice little circuit using easily available parts that would let you connect servos to the RCX - with no external batteries or microprocessors or anything! At that time, I said that (...) (25 years ago, 12-Feb-00, to lugnet.robotics, lugnet.robotics.rcx.pbforth, lugnet.robotics.rcx)
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| | Re: Drive R/C Servos with the RCX and pbForth (long)
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(...) If you're using a custom motor driver in pbForth, why use the inverter circuit at all? Why not just generate the desired waveform directly? Is there not enough current to drive the servo that way? --Ben (25 years ago, 12-Feb-00, to lugnet.robotics, lugnet.robotics.rcx.pbforth, lugnet.robotics.rcx)
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| | RE: Drive R/C Servos with the RCX and pbForth (long)
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(...) No, the servo needs power to the + and ground terminals to drive the motor to the setpoint indicated by the signal wire. If I don't invert the signal there is no power for about 30msec and only 1 or 2 msec ov voltage on the motor port. By (...) (25 years ago, 12-Feb-00, to lugnet.robotics, lugnet.robotics.rcx.pbforth, lugnet.robotics.rcx)
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| | Grabber Arm from 1.0
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I have several 1.0 sets that I use with Smalltalk for a freshmen class in Computer Science. The grabber arm appears to be an ideal object to control and I would have most of the "extra" pieces needed per the instructions. I am not sure about the (...) (25 years ago, 12-Feb-00, to lugnet.robotics)
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| | RE: Drive R/C Servos with the RCX and pbForth (long)
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(...) I should add here that no external power source is necessary to drive the servo. This is important since a micro or miniservo and an SMT version of the driver can be made to fit INSIDE a space similar to a worm gear box (6588 in LDraw). I'm (...) (25 years ago, 12-Feb-00, to lugnet.robotics, lugnet.robotics.rcx.pbforth, lugnet.robotics.rcx)
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| | Re: Drive R/C Servos with the RCX and pbForth (long)
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Ralph - I'm interested in the use of servos with the RCX, but I have no interest in learning the quirks of another computer language. I'm already a bit familiar with Visual Basic,and control the RCX with it. Can your pbForth solution be duplicated (...) (25 years ago, 12-Feb-00, to lugnet.robotics, lugnet.robotics.rcx.pbforth, lugnet.robotics.rcx)
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| | RE: Drive R/C Servos with the RCX and pbForth (long)
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(...) I hear you, John. Learning a new language can be a bit tricky, and I won't go into the details of why I think it's a good idea to learn different languages to get the benefit of different ways of thinking about problems...oops, don't get me (...) (25 years ago, 12-Feb-00, to lugnet.robotics, lugnet.robotics.rcx.pbforth, lugnet.robotics.rcx)
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| | RE: Drive R/C Servos with the RCX and pbForth (long)
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(...) Oops, forgot to answer the main question. Yes, I have thought about making boards...and as soon as I get out from under my current workload I'm going to give it even more thought.... It is just not worth my time and money to make any less than (...) (25 years ago, 12-Feb-00, to lugnet.robotics, lugnet.robotics.rcx.pbforth, lugnet.robotics.rcx)
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| | Re: Grabber Arm from 1.0
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I (...) What do you mean by "page 87" ? Is that page 87 in a printed brochure or in a downloadable *.pdf file? I could help if you had a description of the piece or the place where I can find it. Regards, Simon (25 years ago, 13-Feb-00, to lugnet.robotics)
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| | Re: Drive R/C Servos with the RCX and pbForth (long)
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In lugnet.robotics, Ralph Hempel writes: <snip> (...) What they will do and what they can do are two separate questions. Basically they can do nothing about the sales. They can complain about not respecting their trademark, or of copying of their (...) (25 years ago, 13-Feb-00, to lugnet.robotics, lugnet.robotics.rcx.pbforth, lugnet.robotics.rcx)
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| | RE: Drive R/C Servos with the RCX and pbForth (long)
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<snipped discussion of the math of selling servo controller boards> (...) I'm not too worried about them stealing the idea. I can't imagine that none of their designers have thought about driving servos with the RCX. The circuit itself is so simple (...) (25 years ago, 13-Feb-00, to lugnet.robotics, lugnet.robotics.rcx.pbforth, lugnet.robotics.rcx)
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| | Re: Grabber Arm from 1.0
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Either, or at least I assume the pdf file is a copy of the printed version, you will know it when you get there Simon. -- Richard Clemens Associate Professor, Computer Science West Virginia Wesleyan College 59 College Avenue Buckhannon, West (...) (25 years ago, 13-Feb-00, to lugnet.robotics)
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| | Re: Drive R/C Servos with the RCX and pbForth (long)
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Ralph, What about the new QC. Since it does not use the Lego Firmware and allows you to use pure C. Could your asm code be used under it. I am interested in using Servos but like John I too do not want to learn another language. I am a Sr Software (...) (25 years ago, 14-Feb-00, to lugnet.robotics)
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| | RE: Drive R/C Servos with the RCX and pbForth (long)
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(...) John, you are not the first person to ask if I could release the code for the driver under QC. Give me a week or two to see if I can bludgeon the code into something that will compile (assemble) for you. I AM using the GNU tools to do the (...) (25 years ago, 14-Feb-00, to lugnet.robotics)
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