 | | Re: rcx brick fail to download
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(...) It could also be the first piece of the communications in progress icon thing. (...) Yeah, remove the batteries and then press the red power button. This will discharge the caps. Then put the batteries back in. I have had odd problems loading (...) (20 years ago, 29-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: rcx brick fail to download
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(...) The upside down arrow in the lower left sounds like the view indicator for output A - but turning the RCX off and on should clear that. The dark circle (I'm guessing in the upper right) sounds like the Datalog indicator (when all four (...) (20 years ago, 29-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | rcx brick fail to download
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Hi, There are two unknown symbols on the RCX, I wonder if anyone could help me to understand it: 1) It had this upside down arrow at the bottom left of the LCD screen. This particular RCX 2.0 brick fails to download the firmware. I tried different (...) (20 years ago, 28-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | RE: roboball experience?
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Thanks to both Tom & Bernard for your input. I noticed they have a roboball compass. Have you incorporated this with the RCX brick? Or, will it work? --thanks in advance! --Elizabeth Mabrey -----Original Message----- From: news-gateway@lugnet.com (...) (20 years ago, 24-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: roboball experience?
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(...) I can't comment on the sensors, but I do have experience w/the balls. The balls are of good quality, well-balanced, and they are a brilliant IR source. (Standard light sensors see them just fine.) However, battery life is quite short (approx. (...) (20 years ago, 23-Mar-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | 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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