 | | Re: Anyone know how to build a stall sensor?
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I assume you have already discarded the simple approach of using a rotation sensor and detecting that it has stopped rotating. (This gives you an odometer for free!) Or if you don't have a rotation sensor, you can use the half width six hole pulley (...) (24 years ago, 6-Sep-01, to lugnet.robotics.rcx)
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| | Re: Anyone know how to build a stall sensor?
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(...) No. I didn't know it existed. Of itself it is interesting, but I actually want to use stalls as a means of collision detection. (...) (24 years ago, 6-Sep-01, to lugnet.robotics.rcx)
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| | Re: Anyone know how to build a stall sensor?
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(...) I suppose you've already considered using the white 24 tooth clutch (looks like a gear)to limit the torque and prevent motor stalls... Jerry (24 years ago, 5-Sep-01, to lugnet.robotics.rcx)
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| | Anyone know how to build a stall sensor?
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Hi, I'd like to be able to monitor the current being drawn by a motor using the RCX (not the CyberMaster :-( ), so that I can detect stalls and possibly spins. I can't believe that this is particularly hard but I can't find any references to one on (...) (24 years ago, 5-Sep-01, to lugnet.robotics.rcx)
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| | Re: RCX IR protocol
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Hi, Juergen has done a small mistake in his example. (...) Better it should be ~f7=~11110111=00001000=08. If you want to get a little bit of math you may add every number to its complement and you will always get ff for the result. If we take (...) (24 years ago, 4-Sep-01, to lugnet.robotics.rcx)
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| | Re: RCX IR protocol
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(...) Take a look at (URL) (...) 55 ff 00 (...) complement, i.e. invert every bit separately. So for example ~f7=~11110111=00001000=10. (...) Good luck and show it to us when you are done Jürgen (24 years ago, 4-Sep-01, to lugnet.robotics.rcx)
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| | Re: RCX IR protocol
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On the page (URL) look under the description of his send command and you'll see he sends a query "10" (hex) and gets a response "ef". This value, 0xEF, is the logical not (modulus 0xFF) of the query value 0x10. The tilde means "not". Dennis (...) (24 years ago, 3-Sep-01, to lugnet.robotics.rcx)
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| | RCX IR protocol
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Hi all, I was looking at the IR protocol described at (URL) and i dont quite understand. In paricular: What is the packet header? what does the ~ mean? (eg "RCX reply opcode is always ~query opcode") I am asking because i am writing an application (...) (24 years ago, 2-Sep-01, to lugnet.robotics.rcx)
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| | Re: Non Robot uses of the RCX
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Hello, Sounds like it was an interesting project. Could you tell me what grade was your daughter in and did she use the standard RCX/Lego Software or something else? thanks (24 years ago, 1-Sep-01, to lugnet.robotics.rcx)
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| | Re: ANN: Article on dead-reckoning with a Mindstorms robot
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(...) Jerry, Thanks. I'm glad you liked the article. When I wrote it, I was hoping that other robotics enthusiasts would be able to adapt some of my techniques to their own dead-reckoning problems. It's good to see folks taking an interest in the (...) (24 years ago, 31-Aug-01, to lugnet.robotics.rcx)
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| | Re: Non Robot uses of the RCX
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My daughter's science fair project last year used an RCX and 3 light sensors to time a LEGO sled sliding down a metal ramp with a LEGO light on the opposite side of the ramp from each light sensor, she had a primitive break-beam sensor. She used the (...) (24 years ago, 1-Sep-01, to lugnet.robotics.rcx)
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| | Re: ANN: Article on dead-reckoning with a Mindstorms robot
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(...) Gary, I enjoyed reading about the project. I liked the article with all of the links to interesting backup material. The results are ...impressive! I have two questions: The subject model does not have a long fore & aft axis. Staying in the (...) (24 years ago, 31-Aug-01, to lugnet.robotics.rcx)
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| | Re: Article on dead-reckoning with a Mindstorms robot
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(...) Thanks for the kind words. The Connecticut Robotics Society (CRS) dead-reckoning contest has no special rules limiting the parts or technology used for the robot, except that it not rely on any kind of external navigation aids (such as (...) (24 years ago, 30-Aug-01, to lugnet.robotics.rcx)
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| | Re: Article on dead-reckoning with a Mindstorms robot
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Loved your article, reminds me of the great stuff the Boulette Robotics club does. I was curious why you used differential steering instead of an adder/subtractor or synchro drive, were there some rule limitations on parts you could use? "G.W. (...) (24 years ago, 30-Aug-01, to lugnet.robotics.rcx)
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| | ANN: Article on dead-reckoning with a Mindstorms robot
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I thought that those of you who are interested in using the Lego rotation sensors for dead-reckoning and navigation might find the following useful. This month's issue of the Seattle Robotics Society's "Encoder" includes an article I wrote about my (...) (24 years ago, 30-Aug-01, to lugnet.robotics.rcx)
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| | Re: Help!! no serial port in new laptop pc!!!...!!!
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In theory - this could work. The Linux IR project folks have had success with using laptop IR ports as remote control devices, but the range is short, and the viewing angle rather limited too.. I've toyed with this myself, and written some code (...) (24 years ago, 28-Aug-01, to lugnet.robotics.rcx)
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| | Re: Drive a motor using the sensor port - safe?
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Should be OK, the light sensor mode works by measuring the resistance of an external LDR (light-dependant resistor), so it is designed to cope with the equivalent short-circuit of a stalled motor.. the only problem might be the back-emf generated if (...) (24 years ago, 28-Aug-01, to lugnet.robotics.rcx)
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| | RCX2 Firmware?
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How do I get the "RCX2" firmware into my RCX? I have a RIS 1.5, and would like to program to the RCX2 API as defined in the RcxCC IDE's documentation. Thanks... (24 years ago, 28-Aug-01, to lugnet.robotics.rcx)
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| | Re: Using Lego RIS software with NT4
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(...) The answer (No!*) can be found here: (URL) RIS 1.0 and 1.5 there are links in french. -Rob Doucette. DoucetteNet LEGO® on Brickbay (URL) W2K and NT are not supported by the RIS software. There are alternatives such as NQC which can be used. (24 years ago, 28-Aug-01, to lugnet.robotics.rcx)
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| | Using Lego RIS software with NT4
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Hi everybody I hope that i'm not the 24th to ask the question ! A french guy ask me if its possible to use standard Lego Mindstorms with NT4. (i use win98, and it works fine). Can someone help me to answer his question ? Thanks Damien PS : he found (...) (24 years ago, 27-Aug-01, to lugnet.robotics.rcx)
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