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Hi again, (...) Ok, i have just discussed this with someone having a ph.d. in physics and that's what he told me: Think of the segway as some big chimney you want to blast. These things break into two pieces while falling sideways. This is because (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | Re: Detecting tilt with an Accelerometer.
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(...) Do you have some concrete reasons why it won't work, to go along with your assertion (for those of us just now joining the conversation)? I suspect that it could be made to work (in conjunction with other data like what the motor output is, (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | Re: Detecting tilt with an Accelerometer.
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(...) It might work, but imho not the obvious way. How it won't work: Measure the acceleration sideways. You would measure an acceleration if you were holding the whole setup at a certain angle, but since the whole sensor including the mechanic (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | RE: Detecting tilt with an Accelerometer.
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(...) Let me chime in and say "It won't work" Tilt detection is almost always done using a simple inclinometer. This is just a weighted pendulum on a potentiometer or shaft encoder. Now, that being said, could figure out that an object is rotating (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | Detecting tilt with an Accelerometer.
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I've had discussions lately with a VERY large number of people about using an accelerometer to detect if an object (like a LegWay) is tilting. I'd like to continue the discussion here, with anyone willing to talk about it. Let me start by saying, (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | Tower crane
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(URL) confess not looking closely at this when it was first publicised. It's amazing. (see also : (URL) ) There is mention at the end of the page of the use of an RCX but not much additional detail... John K. if you're on the list (or anyone else), (...) (23 years ago, 21-Oct-02, to lugnet.org.ca.nalug, lugnet.modelteam, lugnet.technic, lugnet.robotics.rcx)
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| | Re: Project WIRRL Update
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Replying to myself... I dismissed commercial solutions (proper radio modems) because they all looked too expensive. But I've found a beauty: (URL) RS232 @ 38.4Kb full duplex, 15Kbit rf, integral antenna, just under £30 (~$50) each for single units. (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | Re: Anyone for Chess?
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Andy: (...) Yep, many years ago I wanted a "new" chess board. It did what your RCX robot does. It was called Phantom Chess -- 6100 by Milton Bradly. Even then it was very expensive. (about $1200 CAN) a link is here: (URL) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | Re: Project WIRRL Update
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I'm looking for an RF solution for PC-RCX communication as well, been thinking along very much the same lines as Rob seems to have so far, I too was pondering how to deal with TX/RX switching (though I've not got as far as building a circuit, and (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | Re: LEGO MindStroms 2.0: Alternative transmission techniques
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(...) Hi! Basically I think that for communication a Cybermaster would be better, but it lacks a bit of "programmability" as far as I know. And we also want to attach individual sensors and do more than just navigation. The IR to RFand RF to IR (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | Project WIRRL Update
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Hello everyone, WIRRL stands for "Wireless Infra-Red Radio Link". Creating each leg of the RF link independantly isn't really a problem (once you have a reliable 38kHz IR carrier wave). The problem is eliminating link feedback by controlling the (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | Re: LEGO Mindstroms 2.0: Alternative transmission techniques
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(...) Andreas, IR struggles to keep contact in one room, so you need an RF wireless solution. It is possible to include a PDA with Bluetooth or WiFi support as part of your robot, and communicate between the PC and the PDA over the RF protocol, and (...) (23 years ago, 20-Oct-02, to lugnet.robotics.rcx.java)
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| | Re: Anyone for Chess?
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(...) I remember seeing one about 10 years ago, but I don't think it was very popular because of the speed and accracy. I beleive it used a touch sensor grid to detect moves, rather than scanning the board for changes. To move pieces out of the way, (...) (23 years ago, 20-Oct-02, to lugnet.robotics)
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| | AW: LEGO MindStroms 2.0: Alternative transmission techniques
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I have read the book "Core Lego Mindstorms Programming" and this book also discusses navigation. Since this is also my first project with the RCX I don't have much practical experience with navigation. I'm close to testing my dead reckoning system. (...) (23 years ago, 20-Oct-02, to lugnet.robotics)
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| | Re: LEGO MindStroms 2.0: Alternative transmission techniques
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(...) You don't discuss how the robot (or PC) knows where it is. That's the hard part - there has yet to be anything remotely like a solution reported here. We've discussed placing landmarks (like marks on the ground, flashing lights, etc) around (...) (23 years ago, 20-Oct-02, to lugnet.robotics)
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| | Re: About Stop and Float mode
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(...) Yes - that's it - it might not be an open contact though - but a high resistance of some kind. (...) This seems a dangerous thing to do (for the health of the RCX). ---...--- Steve Baker ---...--- HomeEmail: <sjbaker1@airmail.net> WorkEmail: (...) (23 years ago, 20-Oct-02, to lugnet.robotics)
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| | Re: LEGO MindStroms 2.0: Alternative transmission techniques
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I have seen IR-to-RF converters for sale. They are been used for remote control of any TV/VCR units without having the line of sight from the TV/VCR-remote controller to the unit. It is working like this; the remote controller sends a IR signal to (...) (23 years ago, 20-Oct-02, to lugnet.robotics)
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| | About Stop and Float mode
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When I set the output to STOP mode, motor have a brake against moving, when I set output on FLOAT motor can "coast". Ok, until now, But, electrically, how what is the difference ? i mean, if I set in STOP it seems that the motor is connected (...) (23 years ago, 20-Oct-02, to lugnet.robotics)
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| | Re: LNP
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How's this? (...) (23 years ago, 20-Oct-02, to lugnet.robotics.rcx.legos)
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| | Re: LEGO MindStroms 2.0: Alternative transmission techniques
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(...) Or forbid tables etc. and communicate by reflection on the ceiling. (...) Right. Some markings on the floor can make it easier. (...) I can't imagine you never heard of leJOS ((URL) definitely runs Java on the RCX. (...) I'd also suggest to (...) (23 years ago, 20-Oct-02, to lugnet.robotics)
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