 | | IR Tower problems
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I am trying to get nqc 3.1 r1 working on my Slackware 9.1 box using Linux kernel 2.6.11.2. When I plug the IR Tower into my USB port, it's recognized. This is what I get from dmesg: hub 2-0:1.0: state 5 ports 3 chg 0000 evt 0002 ohci_hcd (...) (20 years ago, 17-Mar-05, to lugnet.robotics.rcx)
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| | Re: What that displayed on my RCX2.0?
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(...) This is just the datalog display. It indicates, in 25% increments, how full the datalog is. This indicator is totally harmless, and can be ignored. If you want to get rid of it just download and run the following program: task main() { (...) (20 years ago, 15-Mar-05, to lugnet.robotics.rcx, lugnet.robotics)
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| | Re: power levels clarification
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(...) I couldn't call myself an expert either! In your second way of looking at it, the full voltage and full current are already multiplied to give full power for part of the time. I=(Vcc-Eb)/R Current I, Voltage Vcc, Back EMF Eb and motor (...) (20 years ago, 14-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: power levels clarification
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Hi Mark, (...) is it really true that there is a square law for PWM? Can you explain the reason why this is so? I understand that this is true if you change the voltage (half the voltage gives half the current so a quarter of the power). But I (...) (20 years ago, 14-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: What that displayed on my RCX2.0?
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On Mon, March 14, 2005 5:22 am, Ian Reid said: (...) I believe that means there is some data in the datalog Steve (20 years ago, 14-Mar-05, to lugnet.robotics.rcx, lugnet.robotics)
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| | Re: What that displayed on my RCX2.0?
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(...) That sounds like the datalog indicator - while RIS doesn't take advantage of it (to my knowledge), the RCX can function as a datalogger - the quarter of the datalog that is being loaded flashes, while the quarters of the datalog that are (...) (20 years ago, 14-Mar-05, to lugnet.robotics.rcx, lugnet.robotics)
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| | Re: What is that displayed on my RCX2.0?
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I am not sure here - but could that mean that the batteries are seriously low? It would seem likely if they have been sat for a while, as even when powered down there is some residual current usage, and leakage in the RCX. Remember that when (...) (20 years ago, 14-Mar-05, to lugnet.robotics.rcx, lugnet.robotics)
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| | What that displayed on my RCX2.0?
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G'day, I have been using my RCX 2.0 brick recently after it has been laying idle for a period. I have noticed that there is an extra icon in the display window which is not discussed in the Lego Robotics Invention System 2.0 Constructopedia. I was (...) (20 years ago, 14-Mar-05, to lugnet.robotics.rcx, lugnet.robotics)
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| | Re: power levels clarification
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(...) Others have explained Pulse Width Modulation. However, if the kids are old enough to understand the difference between linear (straight line) and square law (curving ever upwards) and electrical voltage, resistance and power, you could say (...) (20 years ago, 13-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | RE: power levels clarification
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This is really good info... Thank you very much... ---...--- -------- Best Regards, Elizabeth Mabrey Partner of Director LEGO MINDSTORMS 3322 Rt. 22 West, Bldg 4, Ste 402 Robotics Community Branchburg, NJ 08876 Ph: (908) 595-1010 ; M-F: 10-5; Sat: (...) (20 years ago, 13-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: power levels clarification
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Hi Elizabeth, (...) there is an 8ms cycle, and the motor is on for a part of that: 1ms for power level 0, 2ms for power level 1, up to all the 8ms for power level 7. The rest of the time the motor is floating, i.e. the motor inputs are disconnected, (...) (20 years ago, 13-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | RE: power levels clarification
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Thank you very much for your clarification. Any suggestion on reading material about PMW for high school kids. -- Elizabeth -----Original Message----- From: news-gateway@lugnet.com [mailto:news-gateway...ugnet.com] On Behalf Of Thomas Johnson Sent: (...) (20 years ago, 13-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: power levels clarification
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(...) PWM--Pulse Width Modulation. Basically, during a cycle, power is turned on and off. The lengh of time the power is on is the pulse width. Longer pulse widths corispond to higher power levels. This cycling is supposed to happens fast enought (...) (20 years ago, 13-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: power levels clarification
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(...) PWM - pulse width modulation of the electric current going to the motors. CS (20 years ago, 13-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | power levels clarification
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Hi I am curious how the power levels are being implemented. I am not talking about the icon level navigation. How the motor actually adjusts to the different levels setting? Gear slipping? Thanks in advance... -- Elizabeth (20 years ago, 13-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | ECRobot with MATLAB 7
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Hi, in a student research project I got the ECRobot target of the Real Time Workshop in MATLAB 7 working. So it is possible to run a closed loop from Simulink via automatic sourcecodegeneration on the Brick. Detailed instructions in german and a (...) (20 years ago, 1-Mar-05, to lugnet.robotics.rcx)
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| | Re: Problems with Brixcc Cygwin
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(...) This error indicates somewhat obscurely that the download did not complete successfully and that the installer is corrupted as a result. You will need to try downloading the file again. A download utility like Net Transport might be worth (...) (20 years ago, 15-Feb-05, to lugnet.robotics.rcx)
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| | Problems with Brixcc Cygwin
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Hi, I'm running Brixcc on Win 98 and, during the installation process of the optional Cygwin installer, a window appers asking me to open a file named BRICXCCSETUPCYGWIN.002 which doesn't exist! Does anyone know what's happening? Thanks (20 years ago, 14-Feb-05, to lugnet.robotics.rcx)
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| | Re: Can the Run button be reprogrammed?
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(...) Ultimate Robolab provides very easy access to the RCX buttons. With a few icons you can reprogram any of them. Here a nice example : (URL) you press the Run-button in this example, you'll here a sweep down system sound. This is the philosophy (...) (20 years ago, 10-Feb-05, to lugnet.robotics.rcx)
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| | Re: Can the Run button be reprogrammed?
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(...) Not to put too fine a point on it, but RUN, PRGM and VIEW are read from an I/O port, while the ON/OFF button is tied to an interrupt line. That's what lets you wake the RCX up from a deep sleep, which you can't do with the other buttons. Ralph (20 years ago, 9-Feb-05, to lugnet.robotics.rcx)
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