Subject:
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Rotation Sensor Information
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 13 Jan 2002 20:33:49 GMT
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Viewed:
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4264 times
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I agree this is the heart of the problem...
I made a small experiment and saw strange things on my scope. Has anyone
already open a Lego rotation sensor ? I'd like to have a look to internal
photographs and/or see a circuit diagram.
I tried to open one, but everything seems glued and I fear to break it...
Philo
www.philohome.com
> I don't think so.
> The reason that count is lost is that the A/D conversion
> happens just in the moment when the sensor switches between
> two values, and you get neither of the two but the intermediate value
> on the other side of the cycle:
>
> 3
> / \
> 2 (2)
> | |
> (1) 1
> \ /
> 0
>
> Say you go from 1 to 3 and measure the ghost 2 in between.
> The ROM routine then doesn't change the count,
> and it sets the state to 2. The end result is a miscount by two.
> My experiments indicated a miscount for on the order of several
> thousand counts.
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