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With just one light sensor, the problem is that you have to guess which direction you just fell off the line. i.e., your sensor suddently goes from dark to light. Is the dark to your left? Your right? There's no real way of telling, is there? If you (...) (25 years ago, 16-Nov-99, to lugnet.robotics)
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| | RE: Line Followers
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(...) One way around it is a specially graded line. It's black on one side and light on the other, sort of a dark grey in the middle. Try to keep the sensor in the dark grey area. (...) Yes. Now that I have solved the maze problem on paper with the (...) (25 years ago, 16-Nov-99, to lugnet.robotics)
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| | RE: Line Followers
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(...) At some point, my letter had a point about "cheating" by shading the line or edges of the line, which I guess I took out. I've built a large "sumo pit" built on this principle (the floor is shaded with flat black and glossy white spray paint) (...) (25 years ago, 16-Nov-99, to lugnet.robotics)
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| | Re: Line Followers
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(...) You don't really need to shade the line. Start with something like a 3/4" wide black line over a white background. If the light sensor is over the edge between the line and the background it should read a value midway between "black" and (...) (25 years ago, 16-Nov-99, to lugnet.robotics)
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| | Re: Line Followers
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(...) You beat me to the punch, Dave. I was just about to say that, with the light sensor correctly positioned, if it is just on the "edge" of a thick black line on a white background, it sees gray (some black and some white). Given the width of (...) (25 years ago, 16-Nov-99, to lugnet.robotics)
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| | Re: Line Followers
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Hello, After various discussions here about maze walkers and synchro 'bots, I decided to try my hand at YASB (yet another synchro 'bot). Furthermore, I decided that instead inverting the problem as Ralph did, that I would turn it inside out by (...) (25 years ago, 16-Nov-99, to lugnet.robotics)
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| | Re: Line Followers
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Perhaps the light sensor could be placed at the end of a vertical arm that swings in a cone pattern. This would prevent the twisting of connectors. -Wes (...) (25 years ago, 16-Nov-99, to lugnet.robotics)
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| | Re: Line Followers
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Actually, My thoughts were of mounting it geared in such a way that the light sensor traces a circular path without ever actually, itself, rotating. Imagine mounting to some kind of rotating assembly and then mounting that to the end of an arm. As (...) (25 years ago, 16-Nov-99, to lugnet.robotics)
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| | Re: Line Followers
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(...) That is the method I've usually assumed would be best. (...) Wow. This sounds like a mechanical mess, but an elegant solution (in a broader sense) to the depth/breadth issue I was talking about last night. Good luck. My two cents: 1) maybe a (...) (25 years ago, 16-Nov-99, to lugnet.robotics)
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| | Re: Line Followers
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(...) Just a thought (and the reason I still want to use real walls): by bumping into a wall, there are small orientation errors that are introduced (especially when hitting it at an angle). I just like tougher problems! :-) /Vlad (25 years ago, 16-Nov-99, to lugnet.robotics)
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| | Re: Line Followers
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You could make a gantry that can make the arm go forwards and back, and at the same time have it on another gantry that can move side to side. Move both gantrys (sp?) at once and you should be able to carve out a rough circle without twistind the (...) (25 years ago, 16-Nov-99, to lugnet.robotics)
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