[Shimmer-users] Shimmer3: can't get sampling rate > 340

[Shrirang Mare]

I can't seem to get data from Shimmer3 at sampling rate higher than 340Hz.

I configured my Shimmer3 using the ShimmerCapture Android app and set the
sampling rate to 1024 but the data being saved to the file is at about
341Hz. When I set the sampling rate of the Shimmer3 to 512Hz, it actually
logs data at about 256Hz.

Any ideas on how to get higher sampling rates on Shimmer3? I am looking to
get 1024 Hz.

I have another Shimmer3 and I tried sampling at 1024 and 2048Hz on it too
but I get about 400 and 450Hz sampling rates. Or is it that both the
Shimmers have some hardware problem? Any ideas on what might be wrong or if
I'm missing something.

The Shimmer3 is running BT_Stream firmware version 0.5

thanks,
Shri

[Jong Chern]

Hi Shri,

Sorry to hear about your troubles. May I ask as to what sensors you have
enabled on your Shimmer device?

Best regards,
Jong Chern

Post by Shrirang Mare
I can't seem to get data from Shimmer3 at sampling rate higher than 340Hz.
I configured my Shimmer3 using the ShimmerCapture Android app and set
the sampling rate to 1024 but the data being saved to the file is at
about 341Hz. When I set the sampling rate of the Shimmer3 to 512Hz, it
actually logs data at about 256Hz.
Any ideas on how to get higher sampling rates on Shimmer3? I am
looking to get 1024 Hz.
I have another Shimmer3 and I tried sampling at 1024 and 2048Hz on it
too but I get about 400 and 450Hz sampling rates. Or is it that both
the Shimmers have some hardware problem? Any ideas on what might be
wrong or if I'm missing something.
The Shimmer3 is running BT_Stream firmware version 0.5
thanks,
Shri
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[Shrirang Mare]

Hi Jong,

I have Low noise accelerometer, wide range accelerometer, gyroscope, and magnetometer enabled. I also have enabled battery voltage.

thanks,
Shri

Post by Jong Chern
Hi Shri,
Sorry to hear about your troubles. May I ask as to what sensors you have enabled on your Shimmer device?
Best regards,
Jong Chern

Post by Shrirang Mare
I can't seem to get data from Shimmer3 at sampling rate higher than 340Hz.
I configured my Shimmer3 using the ShimmerCapture Android app and set the sampling rate to 1024 but the data being saved to the file is at about 341Hz. When I set the sampling rate of the Shimmer3 to 512Hz, it actually logs data at about 256Hz.
Any ideas on how to get higher sampling rates on Shimmer3? I am looking to get 1024 Hz.
I have another Shimmer3 and I tried sampling at 1024 and 2048Hz on it too but I get about 400 and 450Hz sampling rates. Or is it that both the Shimmers have some hardware problem? Any ideas on what might be wrong or if I'm missing something.
The Shimmer3 is running BT_Stream firmware version 0.5
thanks,
Shri
_______________________________________________
Shimmer-users mailing list
https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users <https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users>
No virus found in this message.
Checked by AVG - www.avg.com <http://www.avg.com/>
Version: 2013.0.3495 / Virus Database: 4257/9077 - Release Date: 02/08/15

_______________________________________________
Shimmer-users mailing list
https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users

[Jong Chern]

Hi Shri,

Unfortunately with the number of sensor channels and the sampling rate
you are using this wont be possible.

There are two limiting factors. The first is the Shimmer baud rate. The
default baud rate is 115200, I would suggest increasing it to 230400,
you should be able to do this using Shimmer Capture which can be found
here
<http://www.shimmersensing.com/support/wireless-sensor-networks-download>.

The second limiting factor is your Android device (/not being able to
consume data fast enough causing a bottleneck which results in dropped
data/). This probably varies across Android device.

My advice will be to increase the baud rate, reduce the sampling rate,
and reduce the number of sensors (e.g. choose a single accelerometer). I
hope that help. Please do note hesitate to contact Shimmer
<http://www.shimmersensing.com/support/wearable-sensing-support/>if you
require further technical assistance.

Best regards,
Jong Chern

Post by Shrirang Mare
Hi Jong,
I have Low noise accelerometer, wide range accelerometer, gyroscope,
and magnetometer enabled. I also have enabled battery voltage.
thanks,
Shri

Post by Jong Chern
Hi Shri,
Sorry to hear about your troubles. May I ask as to what sensors you
have enabled on your Shimmer device?
Best regards,
Jong Chern

Post by Shrirang Mare
I can't seem to get data from Shimmer3 at sampling rate higher than 340Hz.
I configured my Shimmer3 using the ShimmerCapture Android app and
set the sampling rate to 1024 but the data being saved to the file
is at about 341Hz. When I set the sampling rate of the Shimmer3 to
512Hz, it actually logs data at about 256Hz.
Any ideas on how to get higher sampling rates on Shimmer3? I am looking to get 1024 Hz.
I have another Shimmer3 and I tried sampling at 1024 and 2048Hz on
it too but I get about 400 and 450Hz sampling rates. Or is it that
both the Shimmers have some hardware problem? Any ideas on what
might be wrong or if I'm missing something.
The Shimmer3 is running BT_Stream firmware version 0.5
thanks,
Shri
_______________________________________________
Shimmer-users mailing list
https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users
No virus found in this message.
Checked by AVG - www.avg.com <http://www.avg.com/>
Version: 2013.0.3495 / Virus Database: 4257/9077 - Release Date: 02/08/15

_______________________________________________
Shimmer-users mailing list
https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users

_______________________________________________
Shimmer-users mailing list
https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users
No virus found in this message.
Checked by AVG - www.avg.com <http://www.avg.com>
Version: 2013.0.3495 / Virus Database: 4257/9082 - Release Date: 02/09/15

[Shrirang Mare]

Hi Jong,

Your advice worked. With single accelerometer I am able to get 2048 Hz.
Reducing the number of sensors to accelerometer and gyroscope I am able to
get 512Hz, which is sufficient for my application right now.

Thank you.

best,
Shri

Post by Jong Chern
Hi Shri,
Unfortunately with the number of sensor channels and the sampling rate you
are using this wont be possible.
There are two limiting factors. The first is the Shimmer baud rate. The
default baud rate is 115200, I would suggest increasing it to 230400, you
should be able to do this using Shimmer Capture which can be found here
<http://www.shimmersensing.com/support/wireless-sensor-networks-download>.
The second limiting factor is your Android device (*not being able to
consume data fast enough causing a bottleneck which results in dropped data*).
This probably varies across Android device.
My advice will be to increase the baud rate, reduce the sampling rate, and
reduce the number of sensors (e.g. choose a single accelerometer). I hope
that help. Please do note hesitate to contact Shimmer
<http://www.shimmersensing.com/support/wearable-sensing-support/>if you
require further technical assistance.
Best regards,
Jong Chern
Hi Jong,
I have Low noise accelerometer, wide range accelerometer, gyroscope, and
magnetometer enabled. I also have enabled battery voltage.
thanks,
Shri
Hi Shri,
Sorry to hear about your troubles. May I ask as to what sensors you have
enabled on your Shimmer device?
Best regards,
Jong Chern
I can't seem to get data from Shimmer3 at sampling rate higher than 340Hz.
I configured my Shimmer3 using the ShimmerCapture Android app and set
the sampling rate to 1024 but the data being saved to the file is at about
341Hz. When I set the sampling rate of the Shimmer3 to 512Hz, it actually
logs data at about 256Hz.
Any ideas on how to get higher sampling rates on Shimmer3? I am looking to get 1024 Hz.
I have another Shimmer3 and I tried sampling at 1024 and 2048Hz on it
too but I get about 400 and 450Hz sampling rates. Or is it that both the
Shimmers have some hardware problem? Any ideas on what might be wrong or if
I'm missing something.
The Shimmer3 is running BT_Stream firmware version 0.5
thanks,
Shri
_______________________________________________
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2013.0.3495 / Virus Database: 4257/9077 - Release Date: 02/08/15
_______________________________________________
Shimmer-users mailing list
https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users
_______________________________________________
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2013.0.3495 / Virus Database: 4257/9082 - Release Date: 02/09/15
_______________________________________________
Shimmer-users mailing list
https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users