 | | Re: Solar cells and caps: lego part #s
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(...) The capacitor is very much polarity-sensitive. It has +/- polarity indicators on either side of the standard 2x2 9V terminal, as does the solar cell, and it will not work if the polarity is reversed. (24 years ago, 27-Mar-01, to lugnet.robotics)
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| | AI in MindStorms
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I had done a project that integrated the Neural Network and Fuzzy Logic into the RCX for Navigation by legOS. Of course, the network models are simple due to the limited recources. I do not have time to manage the materials and upload them yet. But (...) (24 years ago, 27-Mar-01, to lugnet.robotics)
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| | Re: AI in MindStorms
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My entire goal is AI with mindstorms as input sensors. I'll put up a web page as soon as I have anything. Scott (24 years ago, 27-Mar-01, to lugnet.robotics)
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| | lego cap, polarity, etc
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(...) I don't have one, but can make some guesses. A bridge only works with an AC input - it can't correct the polarity of a DC input. So the Lego cap either has an AC input possibly through a bridge or a DC input which is the correct polarity by (...) (24 years ago, 27-Mar-01, to lugnet.robotics)
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| | Re: lego cap, polarity, etc
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(...) connectors. Uh, a bridge wouldn't be very good if it didn't handle inputs that switched polarities. A bridge should work just fine with a DC input of any polarity (of course for any DC input, only half of the bridge is actually being used). (...) (24 years ago, 27-Mar-01, to lugnet.robotics)
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| | Re: lego cap, polarity, etc
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(...) Right, what I was trying to say is that a bridge can't 'invert' a DC input of one polarity to make an output of another polarity - it can't "correct" anything, a diode can only conduct or not conduct. All a bridge can do is route the given DC (...) (24 years ago, 27-Mar-01, to lugnet.robotics)
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| | Re: lego cap, polarity, etc
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If I read correctly, it sounds as if there are + and - signs on the capacitor, which would imply that there is something that would block an incorrect polarity on the terminal. Maybe the diode and the 2 transistors on the board do this, I do not (...) (24 years ago, 27-Mar-01, to lugnet.robotics)
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| | RE: lego cap, polarity, etc
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That's right - it only needs to protect the capacitor from wrong polarity, but does not have to compensate. Maybe the instructions simply say "if it doesn't work, rotate the connector 90 degrees". Maybe the LED gives some indication if it is (...) (24 years ago, 28-Mar-01, to lugnet.robotics)
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| | (canceled)
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| | Re: lego cap, polarity, etc
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(...) The capacitor doesn't come with any instructions, at least not when purchased individually. The LED indicates when the capacitor is fully charged; when it reaches full charge, the LED begins flashing. I'm assuming at least one of the other (...) (24 years ago, 28-Mar-01, to lugnet.robotics)
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| | Internal Photos of the LEGO Capacitor
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Okay, here's top and bottom photos of the LEGO capacitor's circuit board. They're not the best, but the circuit board is only about 1" square. (URL) Regards Micah J. Mabelitini - LUGNET #918 The University of Kentucky SECC Middlesboro Academic (...) (24 years ago, 28-Mar-01, to lugnet.robotics, lugnet.dacta)
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| | Re: Internal Photos of the LEGO Capacitor
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Ok, I gotta jump in here for a minute, I have 6 Solar cells and 4 Capacitors, I am building them into the Wings of my Robot. (URL) Heres what I know about the Solar Cell and Capacitor. Solar Cell output 2.5 volts direct sunlight, Capacitor and solar (...) (24 years ago, 28-Mar-01, to lugnet.robotics, lugnet.dacta)
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| | Re: Internal Photos of the LEGO Capacitor
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(...) <snip> Their solar panel specs are wrong, or at the very least extremely conservative to the point of being incorrect. I've pulled 4 volts in direct sunlight, even more under a 2 million candlepower spotlight at 6". Assumingly the capacitor (...) (24 years ago, 28-Mar-01, to lugnet.robotics, lugnet.dacta)
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| | RE: lego cap, polarity, etc
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(...) Agreed - a bridge is not an inverter. Pardon this poor representation of the circuit: +---|<----+----|<---+ | | | | B (batt) | | | | +---|<----+----|<---+ | | +--------| |--------+ + (cap) The bridge is able to correctly 'route' the current to (...) (24 years ago, 28-Mar-01, to lugnet.robotics)
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| | Re: Electrical Data Link between 2 RCXs
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Hi Marco, it is always interesting how many other people in the world do have the same problems or are dealing with the same subject. Sometimes I had the feeling that I dealt with "exotic" problems but then I realized that other "Mindstormers" had (...) (24 years ago, 28-Mar-01, to lugnet.robotics.rcx.nqc, lugnet.robotics)
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| | RE: Electrical Data Link between 2 RCXs
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(...) Hi :) (...) Heheh, my feelings exactly before "bumping" into LUGnet community almost a year and a half ago ;) Ok, now, about the way I use Timer() and will try to use FastTimer() or counter loop if proven more effective. I have no need to get (...) (24 years ago, 28-Mar-01, to lugnet.robotics.rcx.nqc, lugnet.robotics)
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| | Lego accessories for the photographer
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Some of you may remember PanoBot, a Lego robotized panoramic head (Cool Lego Site of the week December 17–23, 2000) ... here are new avatars of Lego accessories for the photographer: A turntable for VR-object shooting (animation of a rotating (...) (24 years ago, 28-Mar-01, to lugnet.announce, lugnet.robotics)
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| | Re: New Group?
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Does any LEGO theme have a group? are you going to create lugnet.dinosaurs if it is true? Zhengrong (...) (24 years ago, 28-Mar-01, to lugnet.robotics, lugnet.robotics.rcx, lugnet.general)
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| | RE: Lego accessories for the photographer
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Cool stuff! What do use to take such nice pictures of your Nikon 990? Do you have *two* excellent digicams?!? --Bram Bram Lambrecht bram@cwru.edu (URL) (24 years ago, 28-Mar-01, to lugnet.robotics)
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| | RE: lego cap, polarity, etc
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(...) Yes, thanks for the sketch. Bruce ------- WWW.SYSTRONIX.COM ---...--- Real embedded Java and much more High speed 8051 systems +1-801-534-1017 Salt Lake City, USA (24 years ago, 28-Mar-01, to lugnet.robotics)
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