 | | Advice on Rotation sensors and steering please. —Steve Baker
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| | | OK - so I am now the proud owner of three rotation sensors. I've built a really basic two-wheeled robot with a caster at the back for the purposes of getting in some programming experience with these things. Each wheel has a rotation sensor (...) (24 years ago, 21-Sep-00, to lugnet.robotics)
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| | | | | Re: Advice on Rotation sensors and steering please. —Andy Gombos
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| | | | | In my experience setting the motor to off has worked best. Constantly check for differences in the counts. I was only using 2 sensors, and after 500 or so steps(about 15 ft), there was only a 1 count differenece. The main factor in determining what (...) (24 years ago, 20-Sep-00, to lugnet.robotics)
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| | | | | | | Re: Advice on Rotation sensors and steering please. —Robert G. Fay
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| | | | | | | The solution is to float the motor. There is code in the NQC tutorial for this. It works very well. the file is 9_rotation.nqc I will E mail it if you do not have the file. -- Bob Fay rfay@we.mediaone.net The Shop (URL) Gombos" (...) (24 years ago, 21-Sep-00, to lugnet.robotics)
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| | | | | | | Re: Advice on Rotation sensors and steering please. —Steve Baker
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| | | | | | (...) So you tell your system to drive both motors forward and if you do nothing else then you are only on count off! You must have better matched motors than mine! I see a 10 or 20% difference in their speeds that needs to be corrected to get the (...) (24 years ago, 21-Sep-00, to lugnet.robotics)
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| | | | | | | | RE: Advice on Rotation sensors and steering please. —James Laing
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| | | | | | Steve: Check this page on Lego Dacta. It says 500 rpm Max. (URL) Message----- From: steve [mailto:steve]On Behalf Of Steve Baker Sent: Thursday, September 21, 2000 8:41 AM To: Lego Robotics Subject: Re: Advice on Rotation sensors and steering (...) (24 years ago, 21-Sep-00, to lugnet.robotics)
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| | | | | Re: Advice on Rotation sensors and steering please. —Jerry Kalpin
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| | | | | Of course, for the back wheels you could join the two shafts in a differential and the difference of the two would appear in the rotation of the casing (don't forget some reverse gearing to make the sum zero for two motors going in the same (...) (24 years ago, 21-Sep-00, to lugnet.robotics)
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| | | | | | | Re: Advice on Rotation sensors and steering please. —Steve Baker
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| | | | | | (...) Yes - but it doesn't tell me the distance travelled - I need that too. Still, I guess that using one sensor in the differential for steering and one on *one* of the wheels for distance would work better. I guess that the fact that the (...) (24 years ago, 21-Sep-00, to lugnet.robotics)
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| | | | | Re: Advice on Rotation sensors and steering please. —Dean Hystad
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| | | | (...) I have run into "count loss" using the rotation sensors also. I found that anything above 40RPM is somewhat problematic. I imagine the exact numbers depend upon the size of the program you are running and how it is designed. But no matter what (...) (24 years ago, 21-Sep-00, to lugnet.robotics)
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