 | | Re: A robot who knows his position (fwd)
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(...) [ talk of Dead Reckoning ] (...) That's a useful idea; I'll take note of that. (...) I've been doing some robot building aimed at dead reckoning and have found that even the home or flat environment is enough to f*&k things up; the bumpy (...) (25 years ago, 28-Apr-99, to lugnet.robotics)
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| | Re: A robot who knows his position (fwd)
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(...) Looking forward to seeing them :) (...) Dead-reckoning should be used BETWEEN two consecutive (artificial) landmark sensing. When you get any external reference point you can zero your accumulated errors. (...) moving (...) Seems interesting. (...) (25 years ago, 28-Apr-99, to lugnet.robotics)
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| | Re: A robot who knows his position (fwd)
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(...) I have been thinking about a different approach. I have not actually built anything to use it yet, but I believe it should work reasonably well. The basic idea is similar to the old optical mouse pads -- draw horizontal and vertical lines on (...) (25 years ago, 28-Apr-99, to lugnet.robotics)
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| | Inverting the robot position problem...
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(...) This brings out a VERY interesting application. Most bots have trouble navigating a real maze because of obvious slippage problems and generally poor resolution of sensors. What about inverting the problem and printing (using your favorite (...) (25 years ago, 28-Apr-99, to lugnet.robotics)
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| | Re: Inverting the robot position problem...
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(...) You are right about the limitations of image based maze followers, but with you don't even need to get that complicated- any bot that can follow a wall using touch sensors can do a maze reasonably well. Picture a blind man walking along a (...) (25 years ago, 28-Apr-99, to lugnet.robotics)
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| | Re: Inverting the robot position problem...
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(...) That was what I had intended to use -- 1/8" tape spaced at 1" centers on a white background. I was thinking black and red should be sufficiently distinguishable from each other, but that will probably take experimentation. John A. Tamplin (...) (25 years ago, 28-Apr-99, to lugnet.robotics)
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| | Re: Inverting the robot position problem...
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(...) When one color tape overlaps the other color it may be possible for the sensor to miss the bottom color when it passes over the intersection. Maybe you could use a square piece of tape of a third color at the intersection? Like you said, this (...) (25 years ago, 28-Apr-99, to lugnet.robotics)
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| | RE: A robot who knows his position (fwd)
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(...) Just for reference: The optical mouse pads made by Mouse Systems, and shipped with Sun workstations for a long time, used two detectors in the mouse. One used a red LED, and the other one looked the same, but was dark. I suspect it was an IR (...) (25 years ago, 28-Apr-99, to lugnet.robotics)
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| | RE: A robot who knows his position (fwd)
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(...) Wow- sounds really interesting. Keep us all up to date... Luis ###...### "They call the faithful to their knees to hear the softly spoken magic spell:" "There's no place like home... There's no place like home... There's no place like home." (...) (25 years ago, 28-Apr-99, to lugnet.robotics)
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| | Re: A robot who knows his position (fwd)
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(...) I like John's idea. You could combine it with odometry and get a very affordable and precise positioning system. I'm quite happy with the results of odometry in the short range, I mean until you accumulate too many small errors. My robot (...) (25 years ago, 29-Apr-99, to lugnet.robotics)
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| | Re: A robot who knows his position (fwd)
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(...) [ ... ] (...) Well, I know this, I was just seeing how far I could get without landmarks. An idea Richard Franks and I had was to use black and white approx. A4 size printed markers. These markers would contain a pattern that was detectable by (...) (25 years ago, 30-Apr-99, to lugnet.robotics)
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| | Re: A robot who knows his position (fwd)
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(...) [snip] (...) I'm currently looking at an RCX interface to a Dinsmore compass module that uses Hall-Effect sensors to detect N-S-E-W and triggers two of them when dead-center between two cardinal points, so you get N-NE-E-SE... Not that great (...) (25 years ago, 30-Apr-99, to lugnet.robotics)
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