François TOURDE wrote:
Le 13901ième jour après Epoch,
Schmidt András écrivait:
Tilman Baumann wrote:
Bluetooth would be nice. You would need no hardware hacks on the
phone itself.
Should be pretty easy to hack a bluetooth->serial converter (like
BlueSMiRF from sparkfun) to the sensor. Maybe with a little
microcontroller glue in between.
Bluetooth is very simple to code and simple to handle.
I was thinking about two possible applications:
1. The map of a GPS map viewer application turns when you turn the
machine so it is always aligned with the environment (this feature
is included on some GPS tools.)
Maybe the 3D accels can do that. And the GPS can be used as a bearing
indicator, when you move. No magnetic device needed in this case.
Right! That was an other possible solution I was thinking about. Though
I think that algorithm should be very carefully implemented (a very
sensitive regulator filter) not to accumulate the measurment error of
the accelerometer, and corrigate with the GPS signal when possible. I am
not even sure it is possible. Precision would get worse when you are
moving slow and shake the device (the case on foot). The regulator code
would also consume much energy. Direct measurment of direction seems to
be much better for me.
These are only speculations with little information and no experience
with such devices (accelerometer and magnetic sensor in fact).
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