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(...) But it doesn't need to. The 'power' settings built into the RCX firmware are already using pulse-width modulation to adjust the amount of power the motor delivers. ---...--- Steve Baker ---...--- Mail : <sjbaker1@airmail.net> WorkMail: (...) (23 years ago, 29-Jan-02, to lugnet.robotics)
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| | Re: "Servo" Driver for NQC
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(...) Well I haven't seen your version of the Project-X design, but I'll assume it's similar (albeit vastly inferior) to the one I'm entering. I'm assuming that for the sake of speed, you are keeping moving mass to a minimum and hence, not loading (...) (23 years ago, 30-Jan-02, to lugnet.robotics)
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| | Re: "Servo" Driver for NQC
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"Matthias Jetleb" <Jetleb@Netcom.ca> wrote in message news:3c5763f6.195969...net.com... (...) Ooooooooo, someone else is actually NOT doing a gantry? ;) (...) The mass is at a minumum, but due to the size fo the robot to get the required work (...) (23 years ago, 30-Jan-02, to lugnet.robotics, lugnet.org.ca.rtltoronto)
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| | Re: "Servo" Driver for NQC
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"Steve Baker" <lego-robotics@crynwr.com> wrote in message news:3C56F4B7.FC698E...ail.net... (...) Then why doesn't it work? :-/ At lower power settings, all it seems to do is sit there and humm, not wanting to go. It really dosen't work that well in (...) (23 years ago, 30-Jan-02, to lugnet.robotics)
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| | Re: "Servo" Driver for NQC
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(...) <snip> (...) Right, but in the firmware PWM, it is 'on-float-on-float' not 'on-brake-on-brake' I think (but I'm not sure). In fact, the 'on-brake-on-brake' is a neat way to get fine control to (say) just crack a pneumatic valve to move a (...) (23 years ago, 30-Jan-02, to lugnet.robotics)
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| | Re: "Servo" Driver for NQC
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This is a long post. It covers the following: 1. How the "WAIT x 10 msec" opcode is implemented and its inherent inaccuracy for low delays. And suggests an alternative code implementation 2. How RCX motor PWM is implemented. And the implication that (...) (23 years ago, 31-Jan-02, to lugnet.robotics)
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| | Re: "Servo" Driver for NQC
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<snip> (...) <snip> (...) Really good post! Just a loose end: If you press the 'stop' button on the RCX while a motor is running the motor stops in the 'brake' condition. If you connect a spare motor to a gray battery box with the switch in a (...) (23 years ago, 31-Jan-02, to lugnet.robotics)
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| | Re: "Servo" Driver for NQC
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"Dick Swan" <dickswan@sbcglobal.net> wrote in message news:GqsAv4.GL1@lugnet.com... (...) <snip> Dick, let me first say thank you for the post. I've implemented some of your suggestions and my robot has gone from unuseable to operating as I had (...) (23 years ago, 1-Feb-02, to lugnet.robotics)
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| | Re: "Servo" Driver for NQC
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(...) Yes, but only one of 8 settings (why not all 256??? I don't understand why they limited this). Sometimes only 8 settings doesn't give you enough finesse. Matthias Jetleb (23 years ago, 2-Feb-02, to lugnet.robotics)
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| | Re: "Servo" Driver for NQC
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(...) That was explained earlier. They are using an 8 bit number to store the *pattern* of the modulation. With 8 bits, there are only 8 different ratios of 1's to 0's - and one of those is to have no power at all. Hence there are seven power (...) (23 years ago, 2-Feb-02, to lugnet.robotics)
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