Subject: Re: Robolab Conference - msg#00033

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Re: CD auto feeder project

> Impressive! I would love to learn more about your robot. For example: Why >does it place the CD on the stack on the right and then pick it up again >and drop it on the stack? > > Russ It goes down until stops, then goes up a bit to make the CD fall for gravity. It does not know the height of the stack, so goes down until "feels" to have reached the stack. There is a rotation sensor that detects when the arm stops, and a light sensor to be sure that the CD has fallen (you can see its red light over the CD), but I'm still working on that. hth ______________________ massivng@xxxxxx -- Did you check the web site first?: http://www.crynwr.com/lego-robotics

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Re: CD auto feeder project

Steve Baker wrote: > However, if you left the top hole open to the air and connected > a short hose from the bottom to a suction cup - then pulling up > on the cylinder would "really suck" :-) Note you can also use the same effect to make an all-Lego suction pump (without the checkball valve). The trick is to cycle a piston and a standard valve together. Hook the central port on the valve to the airtank (or whatever else you want to suck the air out of), and the top & bottom ports to a standard piston (I used the large one). As the piston is pulled up (extended), have the valve connect the bottom piston port to the air tank... as the piston contracts, the valve should flip to connect the top piston port to the air tank. I prototyped this yesterday, and the only tough parts where (a) properly synchronizing the valve and piston motion (I threw the valve with a axle sliding on an arm attatched to a main crankshaft axle, offset 90° from the cams running the piston, (b) it takes a lot of torque, the way I rigged it. I tested it on a glass of water - bad idea, as it worked, and the nearly empty airtank sucked water right through the valve body. -- Brian Davis -- Did you check the web site first?: http://www.crynwr.com/lego-robotics

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Robolab Conference

To All: Tufts University, National Instruments, and LEGO are hosting a Robolab conference August 16 & 17 in conjunction with NI week in Austin, Texas. More information here: http://www.ceeo.tufts.edu/events/robolabconference/ Registration is now open. The call for presentation is also open. This is sure to be a great gathering of Robolab users! Hope to see you there, Tonya Witherspoon -- Did you check the web site first?: http://www.crynwr.com/lego-robotics

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Mindstorm Project

Hi all; I need to contract someone to build a Mindstorm or two. I have a few simple projects in mind from the Ferrari books. I have planned to build a LEGO computer case for my brother (who is a big LEGO fan) and I wanted to incorporate the Mindstorm into the case and have it powered by the case (which I understand would take some reconfiguring of the battery case). I would take suggestions of a project but I was thinking a few simple ones like a Pencil Sharpener (a la Anders), or the Simon Sez game, or the Ferrari Plant Waterer. I would need a little consulting on incorporating it into the case I have planned. You can reach me via kb@xxxxxxxxxxxxxxxxx and we can work out the details of labor, project cost, shipping. Thanks very much, Ken Birnbaum -- Did you check the web site first?: http://www.crynwr.com/lego-robotics