 | | 0.5 degree resolution with rotation sensor
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Hi guys! I've been playing with a position controller and thought that could interest someone else. Since the rotation sensor has only 16 counts for 1 full turn, which means 22.5 degrees, I thought about a way to get some more precision. In order to (...) (24 years ago, 31-May-00, to lugnet.robotics)
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| | Re: 0.5 degree resolution with rotation sensor
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Did you have any problem with the slack resulting from the gear train? With so much gears the error generated slack should be greater than the precision. I don't have a rotation sensor yet but some assemblies I made in the past to control sterring (...) (24 years ago, 3-Jun-00, to lugnet.robotics)
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| | Re: 0.5 degree resolution with rotation sensor
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(...) Aren't you fooling yourself slightly here? Just because the input turns 45 times for each turn of the output does not mean that the precision of the output will be 45 times as good. What happens, for example, if you reverse the input axle? The (...) (24 years ago, 3-Jun-00, to lugnet.robotics)
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| | Re: 0.5 degree resolution with rotation sensor
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(...) Actually, I have built such a beast. Or rather, an even more precise beast- don't remember the exact gear setup, but it was roughly in the 625:1 range (4 sets of 8:40(?) gear combinations.) Slop was minimal- a harsh stop and reverse might lose (...) (24 years ago, 3-Jun-00, to lugnet.robotics)
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| | Re: 0.5 degree resolution with rotation sensor
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I don't really need it to be really precise, because, yes, the gear train is a huge factor in a situation like that. I only built the gear train and I'm using another rotation sensor as the reference for my controller. Depending on the position I (...) (24 years ago, 5-Jun-00, to lugnet.robotics)
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| | Re: 0.5 degree resolution with rotation sensor
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(...) I did a design a little while ago, using the ultrasonic rangefinder (this is John Barnes's original design 'redesigned' by me, and built as a PCB), as a 'rangefinder', with a meter needle. Obviously to get reasonable resolution on the needle, (...) (24 years ago, 7-Jun-00, to lugnet.robotics)
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