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Hello: I want to do that my Bot can find a wall, after them i want that his location are parallel or penpendicular to the wall. Anybody here know something about this problem? The start position/orientation don't have any restriction. I'm working (...) (21 years ago, 24-May-03, to lugnet.robotics)
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| | Re: searching walls
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For the drive, can you apply an adder-subtracter mechanism using one rotation sensor? If so, other rotation sensor could be used on rotating ultrasonic. (...) (21 years ago, 27-May-03, to lugnet.robotics)
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| | Re: searching walls
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(...) If you use an adder/subtractor mechanism for driving the robot then you can have one rotation sensor measuring how much you are turning and the other measuring how far forwards you are driving. Then, you can have the ultrasonic sensor driven (...) (21 years ago, 27-May-03, to lugnet.robotics)
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| | THOUGHTS on mapping with Lego Robot ( added to searching walls)
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Hello, What I want to do is take a five foot by five foot square, put random items in the square, MAP THE SQUARE AND OBSTACLES and run our dog robot around the course and never have it stop. I do not want to do obstacle avoidance (that is much (...) (21 years ago, 27-May-03, to lugnet.robotics)
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| | Re: searching walls
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(...) Here is some work I've previously done on wall following and making precise turns of any angle: (URL) As others have pointed out, if the rotation sensor is driven at too low of a speed it can lose counts. So long term wall following requires (...) (21 years ago, 27-May-03, to lugnet.robotics)
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| | Re: THOUGHTS on mapping with Lego Robot ( added to searching walls)
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(...) It's very difficult because all of the 'dead reconing' methods out there are approximate and accumulate errors. If you drive your robot 10 feet in a straight line, your software will probably by 'off' by maybe a half inch, after 20 feet, (...) (21 years ago, 27-May-03, to lugnet.robotics)
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| | Re: THOUGHTS on mapping with Lego Robot ( added to searching walls)
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Hmmm.. if you had two RCX's you could do a polar co-od's trick. Place a spool of white wire with black markers every inch on the robot and a use a light sensor to count the number of black sections that have gone by. Use a rotation sensor on the (...) (21 years ago, 27-May-03, to lugnet.robotics)
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| | Re: THOUGHTS on mapping with Lego Robot ( added to searching walls)
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I'm not good at programing at all, but have some thougts about maze-mapping: If you have some metods of positioning system like GPS then you know exact where the robot are at all time, then the robot can send information back to the PC where there (...) (21 years ago, 28-May-03, to lugnet.robotics)
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| | Re: THOUGHTS on mapping with Lego Robot ( added to searching walls)
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(...) If you can hold a soldering iron, there is a fix to increase rotation sensor precision: (URL) of course this is not a cure for slip/slop problems that will kill dead reckoning anyway ! Philo www.philohome.com (21 years ago, 28-May-03, to lugnet.robotics)
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| | Re: THOUGHTS on mapping with Lego Robot ( added to searching walls)
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(...) items (...) the (...) (that (...) Even commercial guidence systems use periodic recalibration, for example with small magnets in the floor. The robot knows where the magnets are and if it finds a magnet off center to it's expected position it (...) (21 years ago, 28-May-03, to lugnet.robotics)
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| | Re: THOUGHTS on mapping with Lego Robot ( added to searching walls)
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(...) Yes - but that is precisely 100% of the problem. There is no known convenient/cheap GPS-like system with the properties we desire. Camera's above the arena and things pasted onto the floor are not possible in many real-world situations. The (...) (21 years ago, 28-May-03, to lugnet.robotics)
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| | Re: THOUGHTS on mapping with Lego Robot ( added to searching walls)
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(...) are (...) probably (...) inch...after (...) probably (...) I still think that Dead Reckoning could be solved by using three Spybotics towers at the different emissions placed around and have the rcx using polling (get message?) to determine (...) (21 years ago, 29-May-03, to lugnet.robotics)
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