Subject:
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Re: Detecting tilt with an Accelerometer.
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 21 Oct 2002 17:01:46 GMT
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Original-From:
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Till Harbaum <HARBAUM@TM.UKAsaynotospam.DE>
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Reply-To:
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HARBAUM@stopspammersTM.UKA.DE
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Viewed:
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625 times
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On Monday 21 October 2002 18:43, you wrote:
> Let me start by saying, "It won't work."
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 parts inside is actually
"falling", you just don't measure anything. It's like a pendulum attached to
something that falls sideways: You won't be able to see any movement of the
pendulum relative to the falling object it is attached to. You can easily
verify this using your favorite construction toy.
How it might work: Measure the acceleration into the direction of the point
the object is rotating around while falling sideways (e.g. the wheels of the
segway). The acceleration in that direction will be 1g * cos(a), where a is
the angle between the current position of the segway and the verical axis.
But since cos(a) ~ 1 for most small angles, the object has to tilt a decent
amount to measure a significant reduction in vertical acceleration.
Ciao,
Till
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Message has 2 Replies:
 | | 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 (...) (22 years ago, 21-Oct-02, to lugnet.robotics)
| | | 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 (...) (22 years ago, 21-Oct-02, to lugnet.robotics)
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Message is in Reply To:
| | 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, (...) (22 years ago, 21-Oct-02, to lugnet.robotics)
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