 | | Re: Another DIY sensor
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(...) Those cameras have a small, low-resolution CCD in them, and they take snapshots of the mousing surface and compare them to detect the quantity of motion. If you were going to use one of those mice your best bet would be to put together a (...) (25 years ago, 16-Nov-00, to lugnet.robotics)
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| | Re: Another DIY sensor
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(...) Did you consider buying a $5 computer mouse and gutting it? That will give you not one but TWO slotted disks and TWO dual optical detectors. It's hard to imagine another solution for $2.50 per sensor! IIRC, most cheap mice are ~200 clicks per (...) (25 years ago, 16-Nov-00, to lugnet.robotics)
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| | Re: Another DIY sensor
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The optical mice are still $50. I bought one and ended up taking it back, didn't work so well. But it definitely looked cool. Would probably make a good sensor though I don't know what kind of values it sends out... (...) (25 years ago, 16-Nov-00, to lugnet.robotics)
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| | Re: Another DIY sensor
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(...) How about (URL) you filter out the marketing-speak it would appear that the optical sensor is a combination digital camera and signal processor. Dunno what the chances are of getting any sort of intelligle output other than +/- x and y is. (...) (25 years ago, 16-Nov-00, to lugnet.robotics)
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| | A technic elevator
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I have updated my Lego page with my new own creation : a Lego elevator. (URL) Klein A Mindstorms fan. (25 years ago, 17-Nov-00, to lugnet.robotics, lugnet.technic)
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| | Re: Clarification of access control
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(...) I forgot to show that resources get released, the functionality is more like this: try { grabResource(X); ...body... releaseResource(X); } catch (ResourceLostException e) { } Dave (25 years ago, 17-Nov-00, to lugnet.robotics)
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| | Re: Another DIY sensor
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Does the ratio of the disk track diameter and the seperation between the interuptors allow you get 90 degrees (optical) seperation ? IE could you get quadrature off of it ? BTW, Please post pictures : ) Thanks, -JSM (25 years ago, 17-Nov-00, to lugnet.robotics)
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| | BrickBots.Com is launched - New Robotics Contest with Prize
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I have received so much good information by lurking in the LUGNET community, I am finally giving something back. I am pleased to announce both the launch of BrickBots.Com ( (URL) ) and the start of our first contest, the Aluminum Can Stacking (...) (25 years ago, 16-Nov-00, to lugnet.robotics)
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| | Re: any idea if radar can be used with the rcx?
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You can get pretty good proximity detection using the built in IR port to send (arbitrary) messages out and simultaneously sampling with the stock light sensor to pick up IR returns. Proximity detection out to about 10 inches is possible. Search the (...) (25 years ago, 16-Nov-00, to lugnet.robotics)
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| | Re: Clarification of access control
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If a task loses its resources (due to an equal or higher priority task acquiring them), then control leaves the body of the acquire statement. If there is a "catch" block following the acquire, then the catch block is executed, otherwise control (...) (25 years ago, 16-Nov-00, to lugnet.robotics)
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| | Re: any idea if radar can be used with the rcx?
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(...) The RCX doesn't support radar, but the Handy Board with Expansion Board supports the Polaroid Sonar unit... here is a thread on a recent discussion here on it... (URL) Handy Board is essentially the RCX+++, but it does not come in a Lego (...) (25 years ago, 16-Nov-00, to lugnet.robotics)
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| | Re: Another DIY sensor
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Umm. (...) No I didn't! My laptop has a glide point thingy so I don't have box full of dead mice! . But I should investigate! Thanks for the idea. (...) That reminds me. A while ago now, someone here suggested trying out the guts of one of those (...) (25 years ago, 16-Nov-00, to lugnet.robotics)
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| | Re: The Giant Wheelbot (aka 'sphere rat')
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(...) Who was it that built the 'sewer rat' ( a robot that fitted in a pipe, with 4 sets of wheels contacting the walls of the pipe)? It shouldn't be insanely hard to modify into a 'sphere rat'! Did the original sewer rat use synchro drives or fixed (...) (25 years ago, 16-Nov-00, to lugnet.robotics)
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| | Re: The Giant Wheelbot
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(...) Who was it that built the 'sewer rat' ( a robot that fitted in a pipe, with 4 sets of wheels contacting the walls of the pipe)? It shouldn't be insanely hard to modify into a 'sphere rat'! Did the original sewer rat use synchro drives or fixed (...) (25 years ago, 16-Nov-00, to lugnet.robotics)
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| | Re: The Giant Wheelbot
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(...) Stick it in one of those "hamster balls". They make bigger ones for rats and ferrets. --- J Austin David austindavid.com austin@gtf.org Life is hard. It's harder if you use NT. (25 years ago, 16-Nov-00, to lugnet.robotics)
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| | Re: Another DIY sensor
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(...) Then: (...) Now you tell me!!!! Just after I finished implementing a set of cheap and cheerful nqc fixed point transcendental functions based on 100 RCX degrees per rev! JB (25 years ago, 16-Nov-00, to lugnet.robotics)
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| | Re: The Giant Wheelbot
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This reminds me of something I was considering building about a year ago, though not out of Lego. (I consider building a lot of things, but nothing ever gets built) I had the idea to build a remote controlled robot completely contained in a sphere. (...) (25 years ago, 16-Nov-00, to lugnet.technic, lugnet.robotics)
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| | Re: Another DIY sensor
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(...) Use RAW mode. Then you get 2500 to 0 (I think it was) Dean -- Coin-Op's For Sale!: (URL) Lego Workshop: (URL) Lego Club: (URL) (25 years ago, 16-Nov-00, to lugnet.robotics)
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| | Re: any idea if radar can be used with the rcx?
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(...) Not "radar," but you can couple lights to the drive motors, aim them out front, and use the light-sensor. It will see the reflected light near an object, and react accordingly. On a scout, I make it "avoid light." The thing will get ~ 4 inches (...) (25 years ago, 16-Nov-00, to lugnet.robotics)
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| | Clarification of access control
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I'm curently reading Extreme Mindstorms. In listing 4.2 (see below) the seek task acquires the user defined resource and then enters an inner infinite loop looking for a target. It appears to me that if the seek task losing ownership of the user (...) (25 years ago, 16-Nov-00, to lugnet.robotics)
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