On 29.11.10 21:36, keyd...@gmx.de wrote:
Hi,
this is rather off topic, but as I can't find any useful information googling
and know the nice and helpful people on this list, I try asking :-)
(Also, it's peripherally related as it's about calculating velocity from a
smartphone's acceleration data using moby :-;)
To calculate velocity from acceleration I'd like to use Euler integration (at
least this is what people normally seem to do), but I have no idea what to do
about the initial velocity.
I cannot assume that the application is started exactly when a person starts to
move, so the initial velocity will most certainly not be 0 but can be anything.
I am afraid you will have to assume 0 when tha application starts. There
is no way you can determine absolute speed using an accelerometer alone.
OTOH you could add a "calibrate" button to the interface and request the
user to press it while standing still.
You will get funny results if someone calibrates inside a moving vehicle
which sometimes stops (like a bus). ;]
--
regards,
Jakub Piotr Cłapa
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