 | | I've got what Iain Hendry's got, was Re: Swan Firmware
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(...) I've got the flashing five problem as well, and it's really annoying, I spent most of my Friday in vain trying to fix it. I thought/think it's a stack overflow problem, but after serious optimising of my program It's made zero difference. (...) (20 years ago, 16-Jul-05, to lugnet.robotics.rcx.nqc)
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| | Re: different output power at different ports?
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(...) Sounds like more friction in the drive mechanism to one wheel than the other. I've had the same problem with tank-driven robots. I was using the fast 9V motors geared down, but they were under-powered for the application. The friction in the (...) (20 years ago, 15-Jul-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: different output power at different ports?
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You're absolutely sure it's not a sticky wheel? Thomas (...) (20 years ago, 15-Jul-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: different output power at different ports?
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(...) This sounds to me like a good tactic. Your program might have some issue with turning in one direction vs another. (...) I also have trouble believing variations in parts (except the motors themselves) will cause this much difference. Ralph (20 years ago, 14-Jul-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: different output power at different ports?
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(...) Okay - did you try a simple program going in a straight line, and check how much it veered after a few meters? Unfortunately - it does not sound an entirely unlikely problem - if there are variations between the h-bridges (general (...) (20 years ago, 14-Jul-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | RE: different output power at different ports?
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On Thu, July 14, 2005 10:12 am, Elizabeth Mabrey said: (...) well, I'm not a precious hardware guru, :) but I find it hard to believe the small difference in the electronics would make a noticeable difference in the output of the motors. If you're (...) (20 years ago, 14-Jul-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | RE: different output power at different ports?
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Sorry... I meant "precise hardware verification" not precious. I do not the equipment to measure them. Any suggestion, other than getting extra hardware like a power analyzer, for trouble shooting? Trouble shooting is always (well, almost always) (...) (20 years ago, 14-Jul-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | RE: different output power at different ports?
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(...) Without any precious hardware verification, this is what I did: - symptom: motor C was not able to make turn as well as motor A can - troubleshooting steps: a) to ensure even load on both motor ports, I removed all other attachments, and left (...) (20 years ago, 14-Jul-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: different output power at different ports?
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(...) This might be a dumb question, but are we talking actual different voltage levels, or different PWM duty ratios? Have you ensured that you have set (from code) the power levels of all the ports to be the same? How have you observed the (...) (20 years ago, 14-Jul-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | different output power at different ports?
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I just confirmed that some RCX happens to allow various output power to different output ports. In my case, the port A tends to produce more power thru motor and the port C does. I then switched the two motors. The condition stays the same. (...) (20 years ago, 14-Jul-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: Control RoboSapein with IR-tower
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A friend sent me this link - here's how to replace RoboSapien's head with a PDA so he can be programmed to do all manner of things... Thomas (URL) (20 years ago, 8-Jul-05, to lugnet.robotics.rcx.legos)
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| | Re: Custom sensor current drain - use two sensor ports?
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(...) Watches with glow-in-the-dark spots on them are a radioactive source. Brian Nielsen (20 years ago, 7-Jul-05, to lugnet.robotics.rcx)
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| | Re: Control RoboSapein with IR-tower
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(...) Doesn't Robolab have some way of starting external applications? You could possibly setup a PC with IR-tower, which would receive a message from RCX ((URL) - are the Robolab messages compatible with Mindstorms RIS? - I cannot find it (...) (20 years ago, 6-Jul-05, to lugnet.robotics.rcx.legos)
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| | RE: Control RoboSapein with IR-tower
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That will be way too cool if this can be done from Robolab..!!! ---...--- -------- 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: (...) (20 years ago, 6-Jul-05, to lugnet.robotics.rcx.legos)
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| | Control RoboSapein with IR-tower
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Hi, if you have a LEGO serial port IR-tower and and you also got a RoboSapien, you can now easily control it from the PC. (URL) to Linux and USB tower coming later...) Feedback is appreciated. Enjoy, Pavel. (20 years ago, 6-Jul-05, to lugnet.robotics.rcx.legos)
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| | Re: Custom sensor current drain - use two sensor ports?
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(...) Also you are likely to get a reasonable reading from Smoke detectors - though please dont dismantle the one that could save your neck! Danny (20 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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| | Re: Custom sensor current drain - use two sensor ports?
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(...) Agreed... but it would be a nice experiment basis! Philo (20 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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| | Re: Custom sensor current drain - use two sensor ports?
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(...) Much easier than that - run down to the local camping store and buy some gas lantern mantles. Unless they've changed something in the last five years or so, they incorperate a reasonable amount of Th-232 which makes geiger counters click (...) (20 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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| | Re: Custom sensor current drain - use two sensor ports?
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(...) As Philippe noted, there are various legal sources, but even without a source there is always natural background radiation to look at, so one idea I have is a device that records the local background level with a sliding pen on a rotating (...) (20 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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| | Re: Custom sensor current drain - use two sensor ports?
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(...) Uranium or thorium ores are easily found in mineralogic collections... very nice radio-sources ;o) Of course precise calibration is another story! See for example (URL) (20 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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| | Re: Custom sensor current drain - use two sensor ports?
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(...) Wow cool, where are you going to obtain radioactive material (legally and without gettting in trouble with the authorities) to test your counter? :) (20 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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| | Re: Custom sensor current drain - use two sensor ports?
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(...) Nice!!! I hope you'll publish your work ;o) Philo (20 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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| | Re: Custom sensor current drain - use two sensor ports?
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On Thu, June 30, 2005 6:53 am, Justin said: (...) ... (...) I love it when this happens. Unfortunately, it usually leads to this: (...) Congradulations on your breakthrough. Steve (20 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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| | Re: Custom sensor current drain - use two sensor ports?
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(...) I take it all back. I'm so brilliant that I found a way to make a (rather large) change to the circuitry that brought things under the limit. Ok, ok, forgive my indulgent self-back-patting, but I'm pretty bouyant right now - everything is (...) (20 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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| | Re: Custom sensor current drain - use two sensor ports?
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Hi Justin, (...) No, the internal circuis are more or less the same. (...) I don't think you could break something. But of course using two input ports is not so great... (...) You might try the kind of trick I used for my GP2D12 sensor ((URL) store (...) (20 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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| | Re: Custom sensor current drain - use two sensor ports?
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Maybe you could use one of the output ports. It might be worth running the sensor schematic by some of those on the board, while I understand the need to keep things under your hat - others may be able to suggest ways of bringing its consumption (...) (20 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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| | Custom sensor current drain - use two sensor ports?
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I'm building a custom active mindstorms sensor, but it requires 28mA to operate, while the sensor port only provides about 15mA. Any advice? (The mA requirements of the sensor cannot be halved - improvements may be possible, but it seems unlikely I (...) (20 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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| | NQC FAQ updated
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I have updated the NQC FAQ with a description of how to fix a USB Tower problem that many users have experienced when downloading a program via NQC. Many users have reported that they get a "Compile Failed no (or invalid) reply from RCX" error when (...) (20 years ago, 29-Jun-05, to lugnet.robotics.rcx.nqc)
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| | Re: lego light sensor's capability of distinguishing colors
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(...) Dang. I just do not have enough on-line hours to discover how many times I can reinvent the wheel ;-). Thanks for the pointer, Steve, and Philo that is a nice piece of work! (20 years ago, 28-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: lego light sensor's capability of distinguishing colors
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On Tue, June 28, 2005 6:50 am, Brian Davis said: (...) That sounds like a really smart idea. At least, that's what I thought when Philo did it: (URL) he just said... (URL) (20 years ago, 28-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: lego light sensor's capability of distinguishing colors
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(...) How about one sensor with a color wheel the RCX can drive (this is how just about all NASA spacecraft take those beautiful pictures)? Another option that might work (read: I've not tested this at all) is using more than one color of light to (...) (20 years ago, 28-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: lego light sensor's capability of distinguishing colors
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(...) The problem is that LEGO light sensor is basically color blind, all you get is different reflectivity levels. Take care of dark shiny surfaces that can reflect as much as lighter ones (try to place the sensor at an angle to avoid direct (...) (20 years ago, 28-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: lego light sensor's capability of distinguishing colors
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(...) Alone - it is not very good. I have seen a custom sensor with three light sensitive elements and filters. you might be able to build a crude one with one light sensor, one motor(slowed down with worm gear or the micromotor), a wedge belt (...) (20 years ago, 28-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: lego light sensor's capability of distinguishing colors
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(...) My guess is you would have to use colour filters to get reasonable results. I did toy with that idea for doing a colour photocopier once, but haven't got around to actually testing it yet. The downside is a 3-colour scanner would either use 3 (...) (20 years ago, 27-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: lego light sensor's capability of distinguishing colors
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On Mon, June 27, 2005 2:07 pm, Elizabeth Mabrey said: (...) I built an M&M sorter that used a LEGO light sensor... (URL) worked out pretty well, because I could just dispose of any evidence of mis-sorting. As far as real results, I think it sorted (...) (20 years ago, 27-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | lego light sensor's capability of distinguishing colors
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Hi Just wonder if there is anyone who has attempted to have lego light sensor to distinguish more colors than just black & white. Blue is too close to black... white is too close to white... ---...--- -------- Elizabeth Mabrey (20 years ago, 27-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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| | Re: vex robotics kit
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(...) I think you're paying not for the compiler, but for the "programmer" (a sort of serial adapter with an integrated PIC that massages the data somehow). But either way, yes, it's an extra $100 to program the thing. And without the ability to (...) (20 years ago, 23-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.edu, FTX)
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| | Re: vex robotics kit
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(...) I don't think so. (...) Sure, but it seems of not much value regarding programming. The informations on the vex site are sparse and not easy to decipher, but I think you will have to: - pay aditional $99 for somethink called easyC, that is (...) (20 years ago, 23-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.edu)
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| | RE: vex robotics kit
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Hi Joe, Their website seemingly offers a lot of other gadgets. However, I have serious doubt about the programming platform though. Or, perhaps I have not found much about the programming language which can interface with it. ---...--- -------- (...) (20 years ago, 21-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.edu)
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| | Re: vex robotics kit
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(...) I haven't used it, but I thank you for pointing it out. (For others, the link is (URL).) I hate to say it, but this looks like it rather blows the socks off of standard LEGO robotics. The starter kit is $300, which is a 50% pricier, but comes (...) (20 years ago, 21-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.edu, FTX)
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