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"Steve Baker" <lego-robotics@crynwr.com> wrote in message news:3A6EFF8A.416F3D...ail.net... (...) Nice post, but you only ran the sensors counting up for x number of seconds. Try *reversing*. Then watch what happens... (IE, bring a sensor back home. (...) (25 years ago, 26-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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Thanks to all for the good information that has been related here. Most of my applications were low rpm which seems to be a definite fault area. I like to use them for absolute programming of positions. I now see the problem in using them in these (...) (25 years ago, 25-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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(...) Just don't go past it's Max or Min areas or you'll have a problem. This is probably a good place for the white slip gear... Dean -- Coin-Op's For Sale!: (URL) Lego Workshop: (URL) Lego Club: (URL) (25 years ago, 25-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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(...) I just read the very interesting posting regarding testing the rotation sensor to evaluate the "missing counts" phenomenon. The above snippit would indicate that the rotation sensor is handled differently from other sensors. It isn't! It is (...) (25 years ago, 25-Jan-01, to lugnet.robotics)
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| | Re: CM-RCX comm
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(...) Ok, one of many possible examples (we're talking about Lego, where your imagination is your limit... err... well, almost ;) I could use an input port of a RCX as a 4th motor controller, using VLL through the LED of a LightSensor connected to (...) (25 years ago, 25-Jan-01, to lugnet.robotics)
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| | LEGO Lab class
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I don't frequent robotics, but I figured I'd post about the class I'm taking. So far, we haven't done any control, just building mechanical stuff. Here are the pictures: (URL) course web site: (URL) Lambrecht bram@cwru.edu (URL) (25 years ago, 25-Jan-01, to lugnet.robotics, lugnet.robotics.edu)
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| | Re: Rotational Sensor & Gearing Down
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(...) But I don't think you did what we reported IS the problem... Did you run the motor FORWARD, then REVERSE so we can see the missing positions? That's where the errors come in. Dean -- Coin-Op's For Sale!: (URL) Lego Workshop: (URL) Lego Club: (...) (25 years ago, 25-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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(...) I think the PIC series of microcontrollers have some sample code for reading quadrature-type rotational sensors (a la mousewheels). Perhaps one could design a PIC-based intermediate module that was dedicated to reading rotational sensors (...) (25 years ago, 24-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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(...) OK - time for the rigerous scientific approach here (well - OK - the half-assed semi-scientific Steve Baker method :-)... I'm typing this email as I run the tests...so right now, I don't know the answers... Test 1: Connect two rotation sensors (...) (25 years ago, 24-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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Thanks for all the inputs! After testing out the rotational sensor with teh 25:1 gearing I have discovered that it will count 402 clicks for 1 rotation. So the sesnor is reading only 2 extra clicks easy to fix in the software to get my robot to (...) (25 years ago, 25-Jan-01, to lugnet.robotics)
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