 | | Re: new icon in RCX LCD readout
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(...) I have no idea how that would come to be blinking, but normally it's the datalog icon. It means something is in the datalog, usually (I say that because I don't know why it would blink after a battery swipe). I don't know how you would erase (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | new icon in RCX LCD readout
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Yesterday I took the batteries out of my RCX to replace them with some rechargeables. After doing this I noticed a new icon on the LCD readout. On the right hand side, about midway down there is now is a pie shaped one quarter of a circle (two (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | serial tower
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I recently bought a second RIS 2.0 and was wondering if anyone had a serial tower that they would be willing to trade for a usb tower. If anyone is interested please contact me. rcx2man@hotmail.com Thank You Scott (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | Re: Detecting tilt with an Accelerometer.
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(...) No acceleration along the sensed axis, yes. (...) At this point, we need to know the type of sensor you're using (is it a pendulum type sensor, or a linear compression sensor, or gyroscopic precession sensor, or something even stranger?), and (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | RE: Detecting tilt with an Accelerometer.
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(...) Steve, The accelerometer is actually a micromachined beam. Think of a miniature version of your arm holding a 5 lb brick. Your measurement axis is rotation about the shoulder joint. Whether or not you or the brick are moving, the brick is (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | Re: Detecting tilt with an Accelerometer.
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(...) Stop eating for just a sec, and help me understand this. If a sensor (accelerometer) is parallel to the earth's surface, the reading should be zero, right? (no acceleration due to gravity) But, if the object holding the sensor begins to fall (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | Re: Detecting tilt with an Accelerometer.
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(...) I think I figured this out, right before I read this. I'm not sure if this is what you're saying, but if I put the sensor on the bottom, under the axle, then it will spin opposite the direction the LegWay is falling. So, it could actually (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | RE: Detecting tilt with an Accelerometer.
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(...) <sound of Ralph eating his poorly thought out words> John, You are, of course, correct. The beam is always under 1 G if it is parallel with the Earth's surface. In free-fall, the beam becomes "weightless" and the accelerometer returns 0. As (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | Re: Detecting tilt with an Accelerometer.
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A typical micromachined accelerometer WILL measure tilt of a platform that is not otherwise accelerating. The value the sensor returns will be g*sin(tilt angle) if the sensor is placed level on/in the platform. If the platform is accelerating, the (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | Re: Detecting tilt with an Accelerometer.
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(...) it. (...) Umm... that is a type of accelerometer, unless there's a terminology difference that I'm not aware of. (Consider what happens to the sensor when pushed sideways (not on axis) without rotation... you get transient swings representing (...) (23 years ago, 21-Oct-02, to lugnet.robotics)
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| | Re: Detecting tilt with an Accelerometer.
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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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