 | | 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 (...) (21 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 (...) (21 years ago, 14-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | RE: Motor port status for Robolab
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Hi Yes, I indeed did try all those steps, but they did not work. I will greatly appreciate it if you could post the individual vi files. Thank you so much in advance! ---...--- -------- Best Regards, Elizabeth Mabrey -----Original Message----- From: (...) (21 years ago, 13-Mar-05, to lugnet.robotics.rcx.robolab)
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| | Re: Motor port status for Robolab
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(...) You ought to be able to just double click on the .llb. If that doesn't work, try opening it from within Robolab. Either use the open command or the select .vi from the tools pallet. If there are still troubles, let me know and I'll post the (...) (21 years ago, 13-Mar-05, to lugnet.robotics.rcx.robolab)
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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 (...) (21 years ago, 13-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: explain the definition of the firmware to kids...
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(...) Firmware is the Operating System for the RCX, the way Windows (or whatever) is the OS for your PC. Firmware by itself doesn't do anything, it's just there to run the programs that you write. It's like the trays in the cafeteria that hold your (...) (21 years ago, 13-Mar-05, to lugnet.robotics.rcx.robolab, lugnet.robotics.edu)
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| | RE: Motor port status for Robolab
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Hi, I would love to learn how this is done. I am using Windows OS, how do I extract the vi files from your llb download? Thank you very much in advance! -- Elizabeth -----Original Message----- From: news-gateway@lugnet.com (...) (21 years ago, 13-Mar-05, to 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: (...) (21 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, (...) (21 years ago, 13-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Motor port status for Robolab
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Greetings All, I wrote a set of vi's that let you programmatically determine the status of a motor port. With these .vi's you can find a port's power level, direction, brake/float status, and on/off status. They can be found at: (URL) .vi's are (...) (21 years ago, 13-Mar-05, to lugnet.robotics.rcx.robolab)
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