Hi Stephen, Firstly you should note that ShimmerConnect was written as a (relatively) simple sample application that can demonstrate the capabilities of the Shimmers, and not necessarily as a robust end-user application. The source code of ShimmerConnect is made available to Shimmer customers as a starting point towards building more efficient (and fully featured) custom applications.
One very inefficient part of ShimmerConnect is it's graphing capabilities (this was intentional in order to keep that part of the code simple). Disabling the graphs (under the Tools menu) and just logging to fine should improve matters. As a quick test I started 4 instances of ShimmerConnect and set 4 Shimmers streaming 3 channel Accel at 500Hz. With the graphs disabled all 4 instances ran until I manually stopped them an hour later (note that the PC I am using has lower specs than your laptops, but I am running Linux rather the Windows). I also ran the same test but used 4 instances of a simple python script instead of ShimmerConnect, and again they ran without issue until I stopped them (again, about an hour later). Alternatively you might want to consider making use of the Shimmer Labview library. One of the included example VIs streams from 4 shimmers simultaneously and writes the data to file. Mike On Sun, Mar 18, 2012 at 12:04 AM, Stephen Slaughter <[email protected]> wrote: > I am trying to reliably gather data from 10 Shimmer 2r EMG units via > Bluetooth to 3 separate laptops. These laptops > are Win 7 with quad core I7 2670QM chips, nVidia GT 540m graphics chips, and > 8GB RAM. I use Shimmer Connect v0.2 > by running 3 instances on 2 of the laptops and 4 on another. The Shimmer > units are always fully charged and connect via > Bluetooth just fine. They are all programmed with the boilerplate code. The > problem is that the Shimmer Connect software always hangs > up and the most I have reliably gathered data with is from 8 units (3 and 3 > and 2). I select the EMG box and 500Hz on the > configuration menu and write the data to a file. The units are always within > 10 feet of the computers. Has anyone else > experienced these issues? Are there any suggestions? Thanks in advance. > > _______________________________________________ > Shimmer-users mailing list > [email protected] > https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users > _______________________________________________ Shimmer-users mailing list [email protected] https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users
