issues with dropped data

worsterk

I am collecting data (100Hz Accelerometer) on MMRs in a group of 5 in logging mode. Consistently, the data recorded on each IMU is of a different length (not saving equal number of data points), have different start times (perhaps a rolling start), the time between starting each IMU is not consistent, and the time between each sample is not consistent. Is this functioning as designed or is there a way to change settings to fix? We have seen these issues repeatedly and for over 15 different MMRs. Any help in resolving these issues is much appreciated. Thanks!

Laura

That's normal and it's how to real world works.

When you collectively group MetaWears, your phone still communicates with each sensor, one at a time.

• Connect sensor 1 - start logging at t
• Disconnect sensor 1
• Connect sensor 2 - start logging at t+x
• Disconnect sensor 2
• and so on.......delta time passes....
• Connect sensor 1 - download data at t + delta
• Disconnect sensor 1
• Connect sensor 2 - download data at t + x + y + delta
• Disconnect sensor 2

You then need to just get rid of any extra time stamps (the t+x and t+y of sensor 2 in my example).

That's no big deal, you can do it with a small script or even manually with Excel.

PS: Real life doesn't give you clean textbook data.