 | | Re: moving in a straight line with two motors? —Alex Wetmore
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| | | From: John Scott Kjellman <jkjellman@ameritech.net> (...) The main downside with this approach is that you can't turn on axis (so your vehicle will no longer have a turning radius of 0). When I first got the mindstorms I thought that it would be (...) (26 years ago, 13-Nov-98, to lugnet.robotics)
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| | | | | Re: moving in a straight line with two motors? —Ardjan Besse
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| | | | | Op een zekere dag, te weten Fri, 13 Nov 1998 17:21:08 GMT, klom lego-robotics@crynwr.com (Alex Wetmore) in het toetsenbord en schreef ons: (...) But you don't have to drive two weels. When you make one wheel for steering (thus making a (...) (26 years ago, 13-Nov-98, to lugnet.robotics)
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| | | | | | | Re: moving in a straight line with two motors? —Patrick Gili
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| | | | | | Ardjan Besse wrote in message <364c7d42.4532817@lu...et.com>... (...) "Straight" is a relative term. For example, while the alignment might be 0straight, the wheels might not provide the bot with the ability to travel in a straight line. I believe (...) (26 years ago, 14-Nov-98, to lugnet.robotics)
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| | | | | | | | Re: moving in a straight line with two motors? —Daniel Miller
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| | | | | | (...) 1) You've been playing too much Carmageddon. 2) Control theory is relatively new (it paces the development of computers). There are quite a few good textbooks available, but a professor is a much greater help. Familiarity with calculus and (...) (26 years ago, 14-Nov-98, to lugnet.robotics)
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| | | | | | | | Re: moving in a straight line with two motors? —Patrick Gili
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| | | | | | | Daniel Miller wrote in message ... (...) What? (...) This is all fine and well, but I was thinking about something a little less complex. The RCX doesn't have the power to perform image processing and sophisticated feedback control. What I was (...) (26 years ago, 14-Nov-98, to lugnet.robotics)
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| | | | | | | | | Re: moving in a straight line with two motors? —Daniel Miller
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| | | | | | | | (...) Image processing? Proportional control pushes back proportional to deflection (i.e. it simulates a spring). Derivative control pushes back proportional to rate of deflection (i.e. it simulates dynamic friction). Integral control pushes back (...) (26 years ago, 14-Nov-98, to lugnet.robotics)
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| | | | | | | | Re: moving in a straight line with two motors? —Scott Furman
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| | | | | | | (...) Believe it or not, I've been working on exactly this problem for the last few days. I built an angle sensor using a 500K potentiometer wired directly to an RCX input port. (Lego's angle sensor doesn't have sufficient angular resolution unless (...) (26 years ago, 14-Nov-98, to lugnet.robotics)
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| | | | | | | | | Re: moving in a straight line with two motors? —Ben Laurie
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| | | | | | | | | (...) I think making the pendulum longer should cure this... (...) Possibly making it heavier will cure this... Cheers, Ben. (26 years ago, 14-Nov-98, to lugnet.robotics)
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| | | | | | | | | Re: moving in a straight line with two motors? —Daniel Miller
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| | | | | | | | (...) Perhaps you're asking too much of them. Try toning down the pendulum; that is, give it some length below the hinge point as well. As long as it's still top-heavy you're still technically an inverted pendulum, and the added mass below the pivot (...) (26 years ago, 14-Nov-98, to lugnet.robotics)
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| | | | | | | | Re: moving in a straight line with two motors? —Eric Brok
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| | | | | | What about a gyrocompass in a mobile robot? May work for orientation but eats batteries. Eric Brok Visit LEGO ON MY MIND: (URL) Control section: (URL) section: (URL) (26 years ago, 16-Nov-98, to lugnet.robotics)
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| | | | | Re: moving in a straight line with two motors? —Patrick Gili
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| | | | | Alex Wetmore wrote in message <008601be0f2a$01b821...ft.com>... (...) This would give you a good turning radius. However, it would take the bot a long time to turn. (...) (26 years ago, 14-Nov-98, to lugnet.robotics)
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| | | | | Re: moving in a straight line with two motors? —Linc Smith
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| | | | Alex Wetmore wrote in message (...) If you are thinking pneumatics and mindstorms, you might check out an electric pneumatic switch (made in Lego) at (URL) it is interesting to note that the piston of a fully charged and extended cylinder will (...) (26 years ago, 14-Nov-98, to lugnet.robotics)
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