 | | 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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| | Re: explain the definition of the firmware to kids...
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(...) A program that runs on the RCX that makes it easier to program. Kevin (...) (21 years ago, 13-Mar-05, to lugnet.robotics.rcx.robolab, lugnet.robotics.edu)
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| | explain the definition of the firmware to kids...
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I tried to explain term firmware to middle school age children. The best that I can do without using the technical terms, like embedded software, ROM is this: "Firmware is a set of instructions which must be loaded into the RCX Brick in order for it (...) (21 years ago, 13-Mar-05, to lugnet.robotics.rcx.robolab, lugnet.robotics.edu)
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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: (...) (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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(...) 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 (...) (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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(...) PWM - pulse width modulation of the electric current going to the motors. CS (21 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 (21 years ago, 13-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: FLL not allowing NQC
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(...) In general, the syntax for a computer programming language remains constant, regardless of the nationality of the programmer. There are probably some exceptions to this, but from what I've seen this is the general rule. So, for example, if you (...) (21 years ago, 12-Mar-05, to lugnet.robotics.rcx.robolab)
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| | Re: FLL not allowing NQC; Mindscript is allowed
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(...) The page from which the original image came((URL) says this: "In this program, the RCX will continue beeping until the button is pressed six times. The container keeps track of each time the button is pressed." Having no way to tell simply by (...) (21 years ago, 10-Mar-05, to lugnet.robotics.rcx.robolab, FTX)
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| | Re: Advantage on motor change direction?
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In lugnet.robotics.rcx.robolab, Thomas Johnson wrote: <snip> (...) Um, you can't programmatically detect *in advance* which direction the motor is *set to turn* because that's determined by hardware, namely, by the orientation of the electric cable (...) (21 years ago, 7-Mar-05, to lugnet.robotics.rcx.robolab)
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| | Re: Advantage on motor change direction?
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(...) This command is useful when you don't already know what direction a motor is going. Consider the following contrived example: A Robot w/a single light sensor is supposed to drive back and forth between two black lines. Additionally, this robot (...) (21 years ago, 3-Mar-05, to lugnet.robotics.rcx.robolab)
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