Robotics : 6910


Robotics / 6910

proud of myself (+ some questions) —Matthew Miller
So, I got sent home early from work today, due to the hurricane and all. Good thing because 1) I'd left our windows open 2) Kenmore Square is apparently flooded and it woulda been hard to get home later and, most importantly, 3) I made a cool lego (...) (25 years ago, 17-Sep-99, to lugnet.robotics, lugnet.build)

	Adding motor torque [was proud of myself (+ some questions)] —dave madden
	=>From: mattdm@mattdm.org (Matthew Miller) =>... =>Wow, I can sure tell that there's only one motor. While it works great on =>wood floors, it barely moves on carpet. Is there a good way to add a second =>motor? I hesitate to just link them to (...) (25 years ago, 17-Sep-99, to lugnet.robotics)

		Re: Adding motor torque [was proud of myself (+ some questions)] —Matthew Miller
		(...) Yeah, that makes sense. A bit bulky, but probably worth it. I'll have to try that in Version 0.2. (...) I'm hoping to come up with some way so that the act of powering the lower-geared motor automatically causes it to engage. That way, you (...) (25 years ago, 17-Sep-99, to lugnet.robotics)

	Re: proud of myself (+ some questions) —Ben Williamson
	(...) If you have a fiber optic component from the Extreme Creatures or Space Shuttle sets, you could use that for the heartbeat instead, freeing up the rotation sensor for steering. It's ideal in this role because you don't need to know direction (...) (25 years ago, 17-Sep-99, to lugnet.robotics)

		Re: proud of myself (+ some questions) —Matthew Miller
		(...) Good idea. Unfortunately, I don't have one of those, and am a lot more likely to get a second roation sensor. :) How bulky of a set up would that be? It's a challenge to keep the robot compact. (And necessary, since it's hard enough for this (...) (25 years ago, 17-Sep-99, to lugnet.robotics)

	Re: proud of myself (+ some questions) —Dave Baum
	(...) A differential can be used to add two motors together. One motor on each axle, then let the "shell" of the differential power the drivetrain (which of course has its own differential). (...) If you're adding them together with a differential, (...) (25 years ago, 17-Sep-99, to lugnet.robotics, lugnet.build)

	Re: proud of myself (+ some questions) —Mario Ferrari
	(...) The two motors drivetrain (coupled through a differential) that others suggested is a very practical and effective solution. If you want to try a "different" thing you can set up a vehicle with two or more gears. Less effective but fun to set (...) (25 years ago, 17-Sep-99, to lugnet.robotics, lugnet.build)

	Re: proud of myself (+ some questions) —S. Crawshaw
	(...) If you can accept having "discrete" steering positions, then you can use a touch sensor to mimic a rotation sensor. A line of 1-stud cylindrical elements moving past a touch sensor will give "0" when the sensor is exactly between two elements (...) (25 years ago, 17-Sep-99, to lugnet.robotics)

		Re: proud of myself (+ some questions) —Matthew Miller
		(...) Currently, I've settled for exactly three discrete positions -- left, right, and center. This seems to work well enough for most situations. (25 years ago, 17-Sep-99, to lugnet.robotics)

		Re: proud of myself (+ some questions) —Laurentino Martins
		(...) in the case you have a spare touch sensor can make a tachometer. Since you always know the direction your steering is running, you can count the teeth and know exactly where it's positioned. It's pretty easy to setup: (URL) Martins [ (...) (25 years ago, 17-Sep-99, to lugnet.robotics)

			Re: proud of myself (+ some questions) —Matthew Miller
			(...) VERY clever! Almost as good as a rotation sensor. I'll have to try this. (25 years ago, 17-Sep-99, to lugnet.robotics)

	Ha! (was Re: proud of myself (+ some questions)) —Matthew Miller
	Got up in the middle of the night, moved the slip-clutch to a different position in the drive train (now attached directly to the motor shaft, in fact). Get much better results -- can drive across carpet without breaking a sweat. Should have thought (...) (25 years ago, 17-Sep-99, to lugnet.robotics, lugnet.build)

	Re: proud of myself (+ some questions) —Jim Knepley
	(...) second (...) As part of a different project, I wrote a snippet of code that would maintain a specific speed regardless of the surface. It's based on a rotation sensor target vs. time. If it's going too slow, the motor speed is bumped up by (...) (25 years ago, 17-Sep-99, to lugnet.robotics, lugnet.build)

	Touch Sensor Rotation Counter (was: proud of myself (+ some questions)) —Richard Sutherland
	(...) If you want to free up your rotation sensor and only have a need to count rotations (as in this application) you might want to try my Touch Sensor Rotation Counter (inspired by Laurentino Martins' design). I find it a bit easier to actually (...) (25 years ago, 17-Sep-99, to lugnet.robotics, lugnet.build)

		MLCad? [was Re: Touch Sensor Rotation Counter] —Ben Williamson
		(...) MLCad? Do you have a URL for it? I did some searches and can't find it anywhere. I was previously only aware of LDraw. I'm hoping that one day there will be a Lego CAD program that runs on a real operating system. ;) Thanks, - Ben. ---...--- (...) (25 years ago, 17-Sep-99, to lugnet.robotics)

			Re: MLCad? [was Re: Touch Sensor Rotation Counter] —Duane Hess
			(...) (25 years ago, 17-Sep-99, to lugnet.robotics)

		Re: MLCad? [was Re: Touch Sensor Rotation Counter] —Jonathan Knudsen
		Hi Ben, MLCad was news to me too. I found it here, along with some unified information about LDraw and its data files: (URL) hear a round of applause for Tim Courtney for setting this up. Jonathan (...) it on (...) (25 years ago, 17-Sep-99, to lugnet.robotics)

			RE: MLCad? [was Re: Touch Sensor Rotation Counter] —Ralph Hempel
			Jonathan wrote... (...) (URL) hear a round of applause for Tim Courtney for setting this up. YES!!!! This looks like it might fianlly be easy to use... Thanks Tim, for setting up this very cool, clean looking website. See you all at Mindfest!!! (...) (25 years ago, 17-Sep-99, to lugnet.robotics)