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 17:49:47 GMT
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Viewed:
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730 times
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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 acceleration is coupled into the "down"
direction biasing it some direction other than down. Just as pendulum would
swing back in a vehicle accelerating forward, but would return to its
straight up and down position when the vehicle is at constand speed. (Going
around corners is, however, "accelerating"!!!. If the vehicle is parked on a
hill, a pendulum would reflect this after the vehicle's maneuveres were
completed.
John Barnes
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Message has 1 Reply:
 | | 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 (...) (22 years ago, 21-Oct-02, to lugnet.robotics)
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Message is in Reply To:
| | 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 (...) (22 years ago, 21-Oct-02, to lugnet.robotics)
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