 | | 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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| | Shutting off illumination LED on Light Sensor for LIDAR
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Has anyone successfully found a way (short of paint, or cutting internal wiring) of shutting off the red 'supply light' LED on the Lego light sensor? The supply LED is great for active-detection situations, like line-following, when you need to (...) (24 years ago, 28-Mar-01, to lugnet.robotics)
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| | Re: Shutting off illumination LED on Light Sensor for LIDAR
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This sounds very cool. If you want to do the mapping at the bottom, you will have to use alternitive firmware anyway (right?), and they have a passivate command that turns off the light. It passivates the sensor, but I don't think standard firmware (...) (24 years ago, 28-Mar-01, to lugnet.robotics)
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| | Re: Shutting off illumination LED on Light Sensor for LIDAR
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(...) Maybe. I think RCX2 with NQC has some crude arrays, I haven't looked into them yet, but I might be able to use them to do simple mapping on the RCX. Or something even cruder if I don't have arrays. (...) Ahh. Hmm. I wonder what it actually (...) (24 years ago, 28-Mar-01, to lugnet.robotics)
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| | Re: Shutting off illumination LED on Light Sensor for LIDAR
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Hi Chris, You can turn off the LED with software though you may be a little disappointed with the light sensitivity. The reason the LED is on is because your program has set the sensor to an active sensor. If you set the type to NONE make the mode (...) (24 years ago, 28-Mar-01, to lugnet.robotics)
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| | Re: Shutting off illumination LED on Light Sensor for LIDAR
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To make a passive light sensor, you can use a design like Michael Gasperi's: (URL) costs only a couple bucks, and works quite well. If you would like better response from your lego light sensor, you can use a piece of black shrinkwrap tubing and (...) (24 years ago, 28-Mar-01, to lugnet.robotics)
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| | Re: Shutting off illumination LED on Light Sensor for LIDAR
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Ralph Hempel had an example of the heat-shrink tubing solution here: (URL) also tried used some black vinyl from a binder? -Tim (...) (24 years ago, 28-Mar-01, to lugnet.robotics)
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| | Re: Shutting off illumination LED on Light Sensor for LIDAR
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(...) You can find light sensor schematics on Michael Gasperi's page: (URL) Using the RCX IR emitter as the illumination source. Don't know (...) Someone has already tried this. You can check Simen Svale Skogsrud's page for an example, with NQC (...) (24 years ago, 28-Mar-01, to lugnet.robotics)
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| | Unsubscribe
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Sorry, I knew I shouldn't post this but I can not unsubscribe to this newsgroup. I have tried to stop this by going through the option and it doens't recognize this subscription. Please take t-f-l-y@home.com out of you system. Thanks (24 years ago, 28-Mar-01, to lugnet.robotics)
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| | Re: Lego accessories for the photographer
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(...) Sort of... I borrowed the older Coolpix 900 I have at my office ;o) It is quite good for the kind of resolution needed for the web ! Philo (...) (24 years ago, 29-Mar-01, to lugnet.robotics)
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| | Re: Shutting off illumination LED on Light Sensor for LIDAR
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As an alternative method to tubing, you can use an IR filter (black inversible film) as described on my page : (URL) doesn't work with Lego visible lamp though... Philo (URL) (24 years ago, 29-Mar-01, to lugnet.robotics)
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| | Re: lego cap, polarity, etc
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(...) A couple of comments on this... An 'inverter' with respect to DC creates AC, it doesn't swap polarity. If you're going to use the term correctly always use 'invert polarity' and never 'invert' by itself. If you go into a store and ask for a (...) (24 years ago, 28-Mar-01, to lugnet.robotics)
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| | Re: lego cap, polarity, etc
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No. DO NOT UNDER ANY CONDITION CONNECT AN ELECTROLYTIC (ie one with +/- on the terminals) IN REVERSE. The electrolyte is a high resistant in one direction only. The other direction is nearly a short. You may end up hurt as the capacitor blows up in (...) (24 years ago, 28-Mar-01, to lugnet.robotics)
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| | Re: Shutting off illumination LED on Light Sensor for LIDAR
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I drilled a hole in a 1x2 brick to give the light sensor a better sense of direction and to block the LED. The goal was to have the light sensor seek an IR beacon. (...) (24 years ago, 29-Mar-01, to lugnet.robotics)
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| | Re: lego cap, polarity, etc
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(...) <snip> The polarity markings Andy Gombos was referring to are printed on the LEGO-compatible package itself. The LEGO "capacitor" is in fact an electrolytic cap with plenty of support circuitry, and I assure you there is no danger of blowing (...) (24 years ago, 29-Mar-01, to lugnet.robotics)
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| | Re: Shutting off illumination LED on Light Sensor for LIDAR
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(...) Thanks for all the tips, everybody. I set out last night to open up my light sensor and add a jumper to allow me to take the LED out of the circuit. I was unsuccessful in getting the casing open, even after cutting the underside latching tabs (...) (24 years ago, 29-Mar-01, to lugnet.robotics)
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| | Ideas for new sets?
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I have a very basic question, on the subject of new sets and themes and so on; If technic "was" a viable medium for kids with latent engineering skills to learn with, why are those kinds of sets not still available? If Lego were selling to the same (...) (24 years ago, 29-Mar-01, to lugnet.robotics)
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| | Re: Shutting off illumination LED on Light Sensor for LIDAR
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(...) That's not a legOS feature. You just set the input port to passive mode, and read it in RAW mode. There is an example in NQC at (URL) (I forgot to add the address in my previous post :-). (...) You can find light sensor schematics on Michael (...) (24 years ago, 29-Mar-01, to lugnet.robotics)
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| | Re: Ideas for new sets?
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(...) Basically what you're asking is, "Why has LEGO completely lost their mind?". I think the "Technic concept" is still valid. I think it's just being re-marketed under the Mindstorms product line. Who knows what LEGO was thinking when they came (...) (24 years ago, 29-Mar-01, to lugnet.robotics)
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| | Re: Shutting off illumination LED on Light Sensor for LIDAR
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(...) Thanks. I had seen this technique (and noticed this effect myself) but had heard rumor that this impaired the sensitivity of the detector. I'm going to try some rigorous tests and see if I can verify this. (...) We almost needa Yahoo-style (...) (24 years ago, 30-Mar-01, to lugnet.robotics)
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| | Re: Ideas for new sets?
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(...) Don't forget the selling of Lego Technic to George Lucas! I agree the Dacta Catalog is repleat with wonderful kits that are unavailable to the consumer. The solar kit is one of the most fascinating and would be a wonderful way for children and (...) (24 years ago, 30-Mar-01, to lugnet.robotics)
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| | RE: Ideas for new sets?
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(...) While it's true that Dacta products aren't exactly readily available to the average consumer at the local mall, you can easily mail-order them. The catalog is on-line at (URL) are a few mail-order places in the US that carry the Dacta. I have (...) (24 years ago, 30-Mar-01, to lugnet.robotics)
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| | LEGO capacitor cares about polarity
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I found some information about the LEGO capacitor that might help close this discussion at (URL) Characteristics - 1 Farad @ 2.5 Volts Capacity or about 3.125 joules - Operating voltage 2.5 Volts normal, 4 Volts Charging Max. - 250 mA Maximum (...) (24 years ago, 30-Mar-01, to lugnet.robotics)
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| | Re: 2001 Model
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(...) This is very true! I had all sorts of fun "improving" the four legged walking mechanism on the Darkside Developer thing. The way the instructions defined it, it was much too wobbly! With a little care redoing the key leg joints, it work a lot (...) (24 years ago, 30-Mar-01, to lugnet.robotics)
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| | Question about RIS 1.0
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Dear Gang, I recently got the Robotics Invention System 1.0 and I would like to know which would be the positive for the AC adapter, the inside or outside. I have an adapter, but I am not sure how to set the Positive/Negative switch. Thanks, Bryan (...) (24 years ago, 31-Mar-01, to lugnet.robotics)
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| | (canceled)
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| | Re: Question about RIS 1.0
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(...) The RCX uses AC input, not DC. The AC/DC conversion is internal, so what you need is a power adapter that outputs AC. I've heard that you can toast your RCX with an AC/DC adapter as well, so be careful. (24 years ago, 31-Mar-01, to lugnet.robotics)
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| | Re: Question about RIS 1.0
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(...) Is that right? Wouldn't the AC adapter be a AC to DC Converter? I have seen the RCX circuit board and I do not remember there being enough room for a transformer built-in to convert the AC signal to DC. Steven B. Combs, MS, CIT Associate (...) (24 years ago, 31-Mar-01, to lugnet.robotics)
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| | Re: Question about RIS 1.0
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(...) The RCX accepts AC voltage, all it needs to convert to DC is 4 diodes, or a small bridge rectifier. It takes anything from 9-12VAC. Apparently you can do some damage by plugging in DC, as in the long term you will only be passing voltage (...) (24 years ago, 31-Mar-01, to lugnet.robotics)
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| | Re: Ideas for new sets?
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(...) What exists in the real world and what exists in the minds of some marketing personnel is often radically different. The play and educational value of Technic IS still present, but isn't valued as much by the marketing people at Lego. I (...) (24 years ago, 31-Mar-01, to lugnet.robotics)
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| | Re: lego cap, polarity, etc
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(...) This is generally true, but not as dire as you make it sound. (...) Actually, electrolyte is a good conductor of electricity (in any direction). It comprises one of the terminals in an electrolytic capacitor. The other terminal is aluminum, (...) (24 years ago, 31-Mar-01, to lugnet.robotics)
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| | Re: Shutting off illumination LED on Light Sensor for LIDAR
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(...) I strongly suspect this is a myth. A transistor is a transistor is a transistor. They all require biasing in order to function properly and that requires power. Mind you, even so-called passive devices must either generate a voltage or have a (...) (24 years ago, 31-Mar-01, to lugnet.robotics)
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| | Re: Lego Remote Control - Here's The Scoop
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what about newmatic switches? all lot of sets have them to (...) (24 years ago, 31-Mar-01, to lugnet.technic, lugnet.robotics)
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| | Re: Ideas for new sets?
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(...) ...and they are marketing to children raised on Nintendo. We are responsible to teach children how valuable a "highly flexible mechnical building toy" is. ---...--- $50,000 for Jill Behrman (URL) (24 years ago, 31-Mar-01, to lugnet.robotics)
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| | Solar Capacitor
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I have been playing with a couple of Lego solar panels and the Capacitors. (URL) label on the capacitor claims a value of 1 farad. Is this value possible in such a small component? I always thought a 1 farad capacitor would need a huge plate area. I (...) (24 years ago, 31-Mar-01, to lugnet.robotics)
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| | Re: Solar Capacitor
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(...) Yeah it's for real. There's been alot of discussion about the capacitor on here recently, just do a news search. (24 years ago, 1-Apr-01, to lugnet.robotics)
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