 | | Re: Navigation using landmarks (Was: Re: lasers and RCX)
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(...) So, according to the Agilent Technologies web site, these sensors are tiny cameras that take 1,500 pictures per second (!) - they claim 400 'clicks' per inch at speeds up to 12 inches per second. That seems pretty good for a robot - there (...) (23 years ago, 30-Jun-02, to lugnet.robotics)
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| | optical mouse chips as vision sensors?
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(URL) makes the optical mice components and has shipped over 12 million. The link above has some explanation of how they work. It's an interesting idea to see if these could be adapted for robotics. Bruce (23 years ago, 29-Jun-02, to lugnet.robotics)
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| | Re: How do I switch other devices with my RCX.
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Hi, I was wondering: isn't it feasable to use a transistor in stead of a relay? B: What kind do I use? (And how will I regognize it?) Thanks again! Remko (23 years ago, 29-Jun-02, to lugnet.robotics)
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| | Re: Navigation using landmarks (Was: Re: lasers and RCX)
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(...) <blush> (...) Well, where you get the chips is you pull apart a mouse these mice are pretty cheap these days. The software and control logic is all inside the mouse - they don't have any special drivers in the PC. Hence, the protocol is the (...) (23 years ago, 29-Jun-02, to lugnet.robotics)
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| | Re: Navigation using landmarks (Was: Re: lasers and RCX)
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(...) Out of a mouse? Simon, expert at stating the obvious. (23 years ago, 29-Jun-02, to lugnet.robotics)
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| | Re: Navigation using landmarks (Was: Re: lasers and RCX)
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(...) tiny (...) suitable (...) What a good idea. Does anyone know how they work and where to get the chips? Peter (23 years ago, 29-Jun-02, to lugnet.robotics)
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| | Re: Light Sensor Problem
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I had similar problems, so I added a bit of code to display the light sensor value on the LCD. I then placed the bot on the test pad and observed the various numbers as it crossed from white to green and black. I then updated the linetrack.c with (...) (23 years ago, 29-Jun-02, to lugnet.robotics.rcx.legos)
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| | Re: Control a microScout
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Hi Juan!, It's good to see another venezuelan in this group. I thought I was alone... Steve Baker gave you a very good explanation. I think however that you could check (URL) you're already into NQC you can use this lib to send commands to the (...) (23 years ago, 28-Jun-02, to lugnet.robotics)
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| | Re: Dead reckoning (was Re: Rover Programming)
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Hi Simon, In my experience casters can introduce errors in the navigation since they tend to not be in the correct position following a turn. Over time this small error can add up. I have had some success by rebuilding my bot to center as much of (...) (23 years ago, 28-Jun-02, to lugnet.robotics)
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| | Linux driver for USB tower
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Hi, I have a working linux driver for the lego USB tower; so far it has only been tested on kernel 2.4.14 on a uhci system, where it has worked without any problems. Anyone feel like testing it out on their own system (to use it, you will need to be (...) (23 years ago, 28-Jun-02, to lugnet.robotics.rcx.nqc, lugnet.robotics.rcx.pbforth)
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| | Re: Dead reckoning (was Re: Rover Programming)
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(...) Well, I did the code changes to do acceleration and deceleration yesterday and it's amazingly successful. I'm not yet quite as good as the Seattle robot, but I suspect that's at least partly because mine has a narrower track. I now believe (...) (23 years ago, 28-Jun-02, to lugnet.robotics)
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| | Re: Dead reckoning (was Re: Rover Programming)
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(...) WOW! That's impressive - but I can't help but get the impression that it's heavily optimised to going around that particular track. Getting that good positioning on the straight sections is impressive - but I wonder how it would have fared in (...) (23 years ago, 28-Jun-02, to lugnet.robotics)
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| | Re: Dead reckoning (was Re: Rover Programming)
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(...) Yes - managing accelleration is a 'must'...both in speeding up and slowing down - and easing into turns. An abrupt change of speed will generally result in wheel slip. (...) It was good in a straight line - but *hopeless* in a turn because the (...) (23 years ago, 28-Jun-02, to lugnet.robotics)
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| | Re: Rover Programming
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(...) Yes - and it's very fast to implement. Better still, you can use one of several rectangle encoding tricks that are out there (kind of like two-dimensional run-length encoding). Those are typically able to compress at the square of the ratio of (...) (23 years ago, 28-Jun-02, to lugnet.robotics)
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| | Re: Control a microScout
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(...) Well, the RIS 2.0 tower can drive the microscout - but not the RIS 1.5 tower. The microscout uses something called 'VLL' (Visible Light Link) - which is kinda like the IR commands that you send to your RCX - but they are sent in the visible (...) (23 years ago, 28-Jun-02, to lugnet.robotics)
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| | Re: Navigation using landmarks (Was: Re: lasers and RCX)
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(...) I meant the error due to things like refraction around solid objects, reflections, etc. Also - I didn't mean estimating and correcting for it at runtime - I just wanted an idea of what sort of magnitude of error those effects presented. (...) (...) (23 years ago, 28-Jun-02, to lugnet.robotics)
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| | Re: Navigation using landmarks (Was: Re: lasers and RCX)
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Steve (...) and (...) If it were me, I'd program a PIC chip to do everything and then deliver the results to the RCX. But I'm not a Lego purist. (...) Tradition had it that with three radio beacons and three hyperbolae you'd get three lines (...) (23 years ago, 27-Jun-02, to lugnet.robotics)
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| | Re: Rover Programming
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(...) needs (...) uncompressing (...) Run-Length-Encoding (RLE) should work well on a blobby black-and-white map. Or you could store line N as the difference (or XOR) between line N and line (N-1). The difference would be mostly zero. Then RLE it. (...) (23 years ago, 27-Jun-02, to lugnet.robotics)
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| | Re: Rover Programming
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<snip> (...) </snip> I hear dogs do a lot of that also... ;) -Rob (23 years ago, 27-Jun-02, to lugnet.robotics)
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| | Re: Rover Programming
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I've been thinking a bit about using landmarks imitating ants. You should know that ants use different types of self-produced chemicals to mark the places they have been and the paths to follow. Using this with robots would mean using a light sensor (...) (23 years ago, 27-Jun-02, to lugnet.robotics)
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