 | | lasers and RCX —Dan Novy
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| | | Years ago, there was a thread about hooking up lasers to the RCX and using then for signaling and proximity sensing. Aside from the dire warnings (Don't blind the cat!), does anybody remember this thread? I've recently come into ownership of a few (...) (22 years ago, 5-Jun-02, to lugnet.robotics)
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| | | | | Re: lasers and RCX —Steve Baker
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| | | | | (...) We did talk about it for quite a while on this list - but I'm not sure that anything much came of it. I tried putting a laser and a light sensor right next to one-another high up in one corner of the room on an azimuth/elevation mount (...) (22 years ago, 5-Jun-02, to lugnet.robotics)
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| | | | | RE: lasers and RCX —Marco Correia
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| | | | | Yes, I remember. I did save a search on Laser PEN's on eBay because of that :) I planned to use video image analysis (er... machine/robotic vision) to keep track of (and measure) the reflection of laser line on objects. I say LINE and not DOT (...) (22 years ago, 5-Jun-02, to lugnet.robotics)
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| | | | | Re: lasers and RCX —Andy Gombos
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| | | | | I have 2 laser pointers hacked up, waiting for me to buy the diodes and such to finish. :) IIRC, "The Website" has the links, or Lego laser pointer on Google turns them up fine. Andy ----- Original Message ----- From: "Dan Novy" (...) (22 years ago, 5-Jun-02, to lugnet.robotics)
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| | | | | Re: lasers and RCX —Mauro Vianna
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| | | | Hi, Dan I remember that thread. But I don't remember anything concrete about that. I started a small project of mine at the time based on that. I have an sugestion for you. Focus on the problem, not the solution. What do you want to do exactly? (...) (22 years ago, 9-Jun-02, to lugnet.robotics)
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| | | | | | Navigation using landmarks (Was: Re: lasers and RCX) —Steve Baker
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| | | | (...) I've played quite a bit with this kind of problem (although I put the reflector on the robot and the laser in the corner of the room - but that's another story). What's needed is a "RetroReflector" - which is to say, an object that always (...) (22 years ago, 11-Jun-02, to lugnet.robotics)
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| | | | | | Re: Navigation using landmarks (Was: Re: lasers and RCX) —Mauro Vianna
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| | | | Hi, Steve I thought about most of your solutions (sphere, bycicle and 3 mirrors). Unfortunatelly I came to the same conclusions. The funny part is that my alternative nav system was very similar to yours. But it was based on a line, not a ? shape. (...) (22 years ago, 14-Jun-02, to lugnet.robotics)
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| | | | | | Re: Navigation using landmarks (Was: Re: lasers and RCX) —Steve Baker
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| | | | (...) I looked into several patterns. What would be ideal would be something which you could drive across along any straightline path and get back your direction and position from the pattern of dark and light. It seems rather unlikely that such a (...) (22 years ago, 14-Jun-02, to lugnet.robotics)
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| | | | | | Re: Navigation using landmarks (Was: Re: lasers and RCX) —Mauro Vianna
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| | | | (...) which (...) direction (...) Somebody in this list already tried a pattern with 4 colors. If you can have all your floor covered with squares with 4 distinct colors, you can detect your aproximate position and direction. Unfortunatelly that (...) (22 years ago, 24-Jun-02, to lugnet.robotics)
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| | | | | | Re: Navigation using landmarks (Was: Re: lasers and RCX) —Philippe Hurbain
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| | | | | (...) Reducing the rotation sensor speed will probably get things worse: precision loss (less ticks per turn) and _more_ lost counts (see www.philohome.com/se...gorot.htm) Philo www.philohome.com (22 years ago, 25-Jun-02, to lugnet.robotics)
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| | | | | | Re: Navigation using landmarks —Fabio Sardone
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| | | | | (...) Mauro, sorry if it is obvious (I am anovice here) you could connect the two wheels' axles to a differential (reverse one of the rotations). If the differential's body is stationary, the two wheel are rotating at same speed. (22 years ago, 25-Jun-02, to lugnet.robotics)
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| | | | | | Re: Navigation using landmarks (Was: Re: lasers and RCX) —Steve Baker
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| | | | (...) I don't want to cover the entire floor - just place a *few* of these things on the floor as landmarks. The idea is that the robot would run over one of these things, figure out exactly where it is (both position and heading) - and then use (...) (22 years ago, 26-Jun-02, to lugnet.robotics)
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