 | | Laptop IR port
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Sony laptop IR port with W98, I can't program the RCX. Do you have to use the Lego IR tower? ___...___ Get your FREE download of MSN Explorer at (URL) (25 years ago, 27-Jan-01, to lugnet.robotics)
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| | SCARA, Anyone?
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Just curious... Is anyone else trying to do a SCARA? This is really an interesting robot-concept, and I'd love to see others ideas. Programming has been my main headache; I've not successfully implemented any sort of vector/servo typ drive tasks in (...) (25 years ago, 26-Jan-01, to lugnet.robotics)
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| | Re: Interfacing Sharp's GP2D02 Distance Sensor to the RCX
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(...) Hallo Ram, you are right that my solution for the Distance Tracker Bot, the interface for the GP2D02 is a real "resource killer". At the beginning i planned to istall two of the GP2D02 at my RCX with this interface. That's the reason i'd (...) (25 years ago, 26-Jan-01, to lugnet.robotics)
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| | Sv: Chemical sensor?
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Yes, there are some chemical sensors available from (URL) other a pH sensor and an oxygen sensor. What sort of chemistry was on your mind? I am profesionally interested in among other glucose sensors, but I never tried to combine it with Lego. (...) (25 years ago, 26-Jan-01, to lugnet.robotics)
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| | MOC: Brick mixer
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You will find the Brick mixer at (URL) device reads a value on a card, then an arm places colored bricks picked from four feeders on a conveyor belt, ordered according the value read. You will find here photos, films, code and full building (...) (25 years ago, 26-Jan-01, to lugnet.announce, lugnet.robotics) !
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| | Re: Chemical sensor?
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"bernard" <bernardREMOVE.tyers....ieREMOVE> wrote in message news:G7rsHG.529@lugnet.com... (...) DCP had a pH sensor (URL) that can interface to the RCX with an adapter. (25 years ago, 26-Jan-01, to lugnet.robotics)
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| | Chemical sensor?
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Hi all, does anyone know of a chemical sensor for *any* of the mindstorms kit. thanks bernard (25 years ago, 26-Jan-01, to lugnet.robotics)
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| | Re: How many motors can accept a RCX ?
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Alexandre, My guess would be that the the Motor killed the RCX, It seems to be that the newer Technic motors (i.e. Mindstorms motors) often exibit this failure mode. I have had three go this way, and I have heard reports of other people who have had (...) (25 years ago, 26-Jan-01, to lugnet.robotics)
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| | Re: How many motors can accept a RCX ?
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The outputs on the RCX can sink about 500mA of current, and each motor draws up to 200mA when stalled. You can put two on the output and stall them before the thermal shutoff kicks in. I was under the impression (never tried it, mind you) that the (...) (25 years ago, 26-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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(...) I find it really frustrating that this has to be "discovered" over and over. I believe my fix for LegOS (a year ago?) fixes this problem. The sensor itself is very good. It only ever returns the discrete voltages (which vary by cable length (...) (25 years ago, 26-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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"Steve Baker" <lego-robotics@crynwr.com> wrote in message news:3A6EFF8A.416F3D...ail.net... (...) Nice post, but you only ran the sensors counting up for x number of seconds. Try *reversing*. Then watch what happens... (IE, bring a sensor back home. (...) (25 years ago, 26-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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Thanks to all for the good information that has been related here. Most of my applications were low rpm which seems to be a definite fault area. I like to use them for absolute programming of positions. I now see the problem in using them in these (...) (25 years ago, 25-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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(...) Just don't go past it's Max or Min areas or you'll have a problem. This is probably a good place for the white slip gear... Dean -- Coin-Op's For Sale!: (URL) Lego Workshop: (URL) Lego Club: (URL) (25 years ago, 25-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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(...) I just read the very interesting posting regarding testing the rotation sensor to evaluate the "missing counts" phenomenon. The above snippit would indicate that the rotation sensor is handled differently from other sensors. It isn't! It is (...) (25 years ago, 25-Jan-01, to lugnet.robotics)
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| | Re: CM-RCX comm
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(...) Ok, one of many possible examples (we're talking about Lego, where your imagination is your limit... err... well, almost ;) I could use an input port of a RCX as a 4th motor controller, using VLL through the LED of a LightSensor connected to (...) (25 years ago, 25-Jan-01, to lugnet.robotics)
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| | LEGO Lab class
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I don't frequent robotics, but I figured I'd post about the class I'm taking. So far, we haven't done any control, just building mechanical stuff. Here are the pictures: (URL) course web site: (URL) Lambrecht bram@cwru.edu (URL) (25 years ago, 25-Jan-01, to lugnet.robotics, lugnet.robotics.edu)
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| | Re: Rotational Sensor & Gearing Down
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(...) But I don't think you did what we reported IS the problem... Did you run the motor FORWARD, then REVERSE so we can see the missing positions? That's where the errors come in. Dean -- Coin-Op's For Sale!: (URL) Lego Workshop: (URL) Lego Club: (...) (25 years ago, 25-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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(...) I think the PIC series of microcontrollers have some sample code for reading quadrature-type rotational sensors (a la mousewheels). Perhaps one could design a PIC-based intermediate module that was dedicated to reading rotational sensors (...) (25 years ago, 24-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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(...) OK - time for the rigerous scientific approach here (well - OK - the half-assed semi-scientific Steve Baker method :-)... I'm typing this email as I run the tests...so right now, I don't know the answers... Test 1: Connect two rotation sensors (...) (25 years ago, 24-Jan-01, to lugnet.robotics)
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| | Re: Rotational Sensor & Gearing Down
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Thanks for all the inputs! After testing out the rotational sensor with teh 25:1 gearing I have discovered that it will count 402 clicks for 1 rotation. So the sesnor is reading only 2 extra clicks easy to fix in the software to get my robot to (...) (25 years ago, 25-Jan-01, to lugnet.robotics)
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