Mateusz Kondej wrote: > Hi, > > I think that accelerometers in my FR aren't calibrated or driver doesn't > work properly. For example, if I use script form > http://wiki.openmoko.org/wiki/Accelerometer_data_retrieval, I got this > data: > X Y Z SUM > 54 -18 -1062 1063 > 54 -18 -1062 1063 > 36 -18 -1062 1062 > 54 -18 -1062 1063 > 54 -18 -1044 1045 > 36 -18 -1080 1080 > FR is laying on my table, screen to bottom. So it should return gravity, > 981 cm/s^2. But It returns similar values but it's too big for me. > How to get properly results from accelerometers? Eventualy How to > calibrate them?
I'm wondering, why the LIS302DL kernel driver returns 16bit values for each axis. Because the sensor itself has only 8bit resolution for each axis. The next question is if the returned values are normalized to "g * 10^-2" or just upscaled raw values (which makes no sense). Because 1g in 8bit would be ~64 if the sensor is set to +-2g range (which can be changed to +-8g range within the sensor). When the returned values are representing "cm/s^2" than you are right that the z-value is a bit off. But i can't find any related information about how to interpreted the returned x/y/z axis values on the wiki page. Ciao, Rainer _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community