 | | 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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| | Re: Rotational Sensor & Gearing Down
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What kinds of sprocket(s) does Lego currently use with tracks? A long time ago (in decades), I remember a set that used Caterpillar-link-style tracks, and they used a long-toothed sprocket to drive the tracks. It might work to put one of those (...) (25 years ago, 25-Jan-01, to lugnet.robotics)
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| | RE: New guy on the blocks
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Thank you all for the answers. My wife says I can't "play" until I clean my office and I guess this time she's right: I don't have a flat space left in here. I've been reading online a lot and found way too many interesting projects and ideas this (...) (25 years ago, 24-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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I guess I didn't word that very well. I didn't mean that you can make an inaccurate sensor look like an accurate sensor via software. What I meant is that you write your software to know that the sensor is not accurate, i.e. the software doesn't act (...) (25 years ago, 24-Jan-01, to lugnet.robotics)
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| | LEGO Brick Battles
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I’ve started a small (but growing) league of LEGO robot designers. We have our robots engage in different contests, including combat. We’re looking to recruit more members. Specifically, were looking for interested folks in the Chicagoland area. Our (...) (25 years ago, 24-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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"Dean Husby" <nntp@akasa.bc.ca> wrote in message news:3A6E7170.F38BA6...a.bc.ca... (...) accurate sensors would (...) compensate for the inaccuracy (...) disappointed or not to use them. (...) Exactly... you can't. Unless you use another sensor, (...) (25 years ago, 24-Jan-01, to lugnet.robotics)
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| | Re: Cybermaster: Cannot receive though sending works (w/o sprit.ocx)
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Hi, yeah... me I just went through such trouble using Java. The RTS should be 'false'. Then by experimenting I found switching the DTR before and after sending to have some positive effect. I trust you adhere to + starting a session with 'Alive' (...) (25 years ago, 24-Jan-01, to lugnet.robotics, lugnet.robotics.cybermaster, lugnet.robotics.rcx)
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| | Re: Rotational Sensor & Gearing Down
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(...) How do you compensate in software? Dean -- Coin-Op's For Sale!: (URL) Lego Workshop: (URL) Lego Club: (URL) (25 years ago, 24-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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In my experience, rotational sensors are accurate to within +/-5%. 100% accurate sensors would be great, but 95% accurate sensors are still very useful. You can compensate for the inaccuracy in various ways, e.g. in the software. IMHO, this is no (...) (25 years ago, 24-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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"Bob Fay" <rfay@we.mediaone.net> wrote in message news:G7MKLo.2tB@lugnet.com... (...) I'll back that! It's totally hit-and-miss. I've done several tests on different gearings (some running the thing off a micromotor...) and no matter what, they (...) (25 years ago, 23-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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Rotation sensors will lose counts randomly in spite of the firmware. -- Bob Fay California, USA rfay@we.mediaone.net (URL) (25 years ago, 23-Jan-01, to lugnet.robotics)
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| | leJOS presentation
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Hello, I'm going to be speaking about leJOS at the O'Reilly Java conference: (URL) March 29 at the Westin Santa Clara. Unfortunately, you can't come see it for free, but I thought it was worth mentioning anyway. Even though the online description (...) (25 years ago, 23-Jan-01, to lugnet.robotics, lugnet.robotics.rcx.java)
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| | Re: Rotational Sensor & Gearing Down
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How fast is too fast? I'm using the firmware from version 1.0 (...) (25 years ago, 23-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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(...) this seams to be correct :) there might be one problem. If you are to fast, the RCX might loose some ticks. The maximum speed depends on the used firmeware. Carsten (25 years ago, 23-Jan-01, to lugnet.robotics)
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| | Rotational Sensor & Gearing Down
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I just got my 1st rotational sensor and have a quick question for you all. I have the following gearing on my robot. Point A gears 8 <--> 40 8 <--> 40 Point B so this is: (5:1) x (5:1) = (25:1) Right? Now if I put my rotational sensor at Point A, do (...) (25 years ago, 23-Jan-01, to lugnet.robotics)
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| | Re: CM-RCX comm
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"What's new": 1) I'm still waiting for my RIS 1.0 (hopefully +2 weeks) + Update to 1.5 so, everything I do still uses the Out<->In of a CyberMaster, comunicating with itself (the poor thing). 2) I ordered also a Dark Side MicroScout, for VLL output (...) (25 years ago, 23-Jan-01, to lugnet.robotics)
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