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(...) Agreed... but it would be a nice experiment basis! Philo (19 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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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 (...) (19 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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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 (...) (19 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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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) (19 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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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? :) (19 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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(...) Nice!!! I hope you'll publish your work ;o) Philo (19 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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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 (19 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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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 (...) (19 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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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 (...) (19 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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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 (...) (19 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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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 (...) (19 years ago, 30-Jun-05, to lugnet.robotics.rcx)
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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! (19 years ago, 28-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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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) (19 years ago, 28-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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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 (...) (19 years ago, 28-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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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 (...) (19 years ago, 28-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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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 (...) (19 years ago, 28-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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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 (...) (19 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 (...) (19 years ago, 27-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.rcx.robolab)
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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 (19 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 (...) (19 years ago, 23-Jun-05, to lugnet.robotics.rcx, lugnet.robotics.edu, FTX)
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