Le 08/06/2011 20:29, Aydan nous fit lire :
>> > News flash: Robots can't do this either.
> They absolutely can. Have a look at industrial robots
> 

Well, in fact, industrial robots have sequences of fixed positions on
end of run for each axis (be it a translation or rotation) to regularly
reassign the reading of their sensors. Usually perform at start-up and
during the production cycle.

(kind of: push motor to maximum right (against physical stop), store
sensor value. push motor to maximum left... store value. Update sensor's
dataset (for interpolating curve of sensor))
For advanced systems, the physical stop can be replaced by video capture
with pattern matching.

Even the coding wheels (alternative binary on strips with different
frequencies) can only be assumed to have an accurate relative value.

And if you know a bit about using a graduated wheel connected to a
screw, you know that you must always measure by moving from the same
direction, as the screw does not fit the bold exactly in both directions.

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