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Re: Laptop with built-in 3D orientation system

analog devices (and many others) make beatiful tiny MEMS accelerometers and both MEMS (www.analog.com) and piezoelectric (www.gyration.com) gyroscopes intended for tilt sensing and a whole host of other applicaions. we're playing with some now for use in a model aircraft for autonomous flight (it has been done several times before) and they are incredible.

the gyroscopes are most commonly "rate gyroscopes" in that you have to integrate the output to get an angular change and you will get accumulation errors after a few minutes. the accelerometers can sense low-g's so they can actually tell which way is up. i believe the most common setup is a gyroscope to detect the tilt (at high frequency) and an accelerometer to maintain the yroscope calibration.

nobody seems to have developed an accelerometer yet with the response time of they gyros, but depending on what the laptop manafacturers require they might be able to get away with the accelerometer alone instead of a combo sensor - either way very cool to see these in use.

kind regards,

nick

----- Original Message -----
From: Rosco Hill <>
Date: Sunday, October 12, 2003 7:45 am
Subject: Re: Laptop with built-in 3D orientation system

> It is probably an integrated accelerometer (motion sensor) not an
> orientation sensor
> 
> -rosco
> 
> On Sat, 11 Oct 2003, Steve Barr wrote:
> 
> > 
> > http://www.anandtech.com/mobile/showdoc.html?i=1893
> > 
> > Especially:
> > 
> http://www.anandtech.com/mobile/showimage.html?u=http://images.anandtech.com/reviews/system/laptop/IBM/HDAPS/aps_realtime_big.jpg> 
> > Steve
> > -- 
> > http://www.stevebarr.com
> > 
> > 
> > --
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