 | | roboball experience?
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Hi I have been looking into the roboball and the sensors kit. (URL) I wonder if there is anyone out there can share the experience of using this with the RCX. What does it take to install on the RCX? Thanks in advance for your help! -- Elizabeth (...) (20 years ago, 23-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: IR Tower problems
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(...) I think we may have found a problem. This is from /var/log/messages: Mar 19 22:52:42 pitr kernel: usb 2-1: new low speed USB device using ohci_hcd and address 8 Mar 19 22:52:42 pitr kernel: usb 2-1: Product: LEGO USB Tower Mar 19 22:52:42 pitr (...) (20 years ago, 20-Mar-05, to lugnet.robotics.rcx)
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| | Re: IR Tower problems
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(...) Ok, the driver is loaded and major number 180 minor number 160 is correct. Do you see something like this: drivers/usb/misc/leg...sbtower.c: LEGO USB Tower #0 now attached to major 180 minor 160 drivers/usb/misc/leg...sbtower.c: LEGO USB Tower (...) (20 years ago, 19-Mar-05, to lugnet.robotics.rcx)
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| | Re: IR Tower problems
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(...) I'm pretty sure the driver is loaded, this is the output from lsmod: Module Size Used by .. legousbtower 14912 0 .. usbcore 116808 4 legousbtower,ohci_hcd,ehci_hcd and I created /dev/usb/lego0 myself as a character devince with major number (...) (20 years ago, 18-Mar-05, to lugnet.robotics.rcx)
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| | Re: IR Tower problems
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Hi David, (...) these are the log messages from the USB core, but I don't see any from the driver, are you sure the driver is loaded? Also, the device nowadays is supposed to be at /dev/usb/legousbtower0. If you use udev it should create that (...) (20 years ago, 17-Mar-05, to lugnet.robotics.rcx)
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| | 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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