Hi Tifenn, The easiest thing to do would be to just power off the gyro every second sample, but still sample those ADC lines (while discounting the results). Actually sampling the 3 extra ADC channels will be insignificant in terms of power compared with what the gyro itself is drawing.
But you should probably keep in mind that according to the datasheet for the gyro chip the power on-time is up to 200ms (typical 50ms), so powering it off for the 20ms between samples (sampling at 50Hs) is not going to be advisable. Mike On Mon, Aug 26, 2013 at 3:57 PM, Tifenn Rault <[email protected]> wrote: > Hello,**** > > I am using Shimmer2 and I would like to sample the accelerometer at a > different rate than the gyroscope (e.g.: Accelerometer at 100 Hz and > Gyroscope at 50Hz).**** > > In order to do this, is it correct to reset the shimmerAnalogSetup before > every sample, then add the corresponding channels (using either > addAccelInputs or addGyroInputs) and finally trigger the conversion and get > the values in DMA0.transferDone.**** > > The objective to sample at different rates is to save energy through > adaptive sampling and to be able to enable/disable the gyroscope > dynamically independently of the accelerometer. Is it still efficient to > reset the shimmerAnalogSetup configuration before every sample? **** > > Thank you for your help.**** > Tifenn > > _______________________________________________ > Shimmer-users mailing list > [email protected] > https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users > >
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