Discussions

Data Flash Log - Line Number to Seconds

Posted by Bruce on June 22, 2018 at 9:41am

Hi there,

I was wondering if someone mind please explaining how to change the x-axis to have units of time (seconds,milliseconds, etc.) when graphing/exporting Data Flash Logs in Mission Planner. Currently, Mission Planner's Data Flash Log browser plots the value selected vs line number by default, but how do you determine how much time has elapsed between each line number?

Ultimately I would like to analyze this data in MATLAB or Python, and any input is greatly appreciated.

Thank you for your help in advance.

Screenshot_1.png

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Replies

Andre K. June 28, 2018 at 10:29pm

miroseconds since boot.. you can offset it by GPSTime and GPSWeek.
Bruce June 28, 2018 at 3:25pm

Hi Andre,

Thanks for your help. I managed to export the data to MATLAB using the "Create MATLAB File" feature in Mission Planner.

However, I was wondering if you knew what units the "Time US" parameter is in?

Thanks

Andre K. said:

for MATLAB/ python use mavlogdump.py to dump the log in a way that is easy to parse. (install mavproxy if you don't have it yet.)

For analysis/browsing the log, use the best tool; APMPlanner2.

Data Flash Log - Line Number to Seconds

Hi there, I was wondering if someone mind please explaining how to change the x-axis to have units of time (seconds,milliseconds, etc.) when graphing…
Bruce June 28, 2018 at 9:47am

Actually I got the time axis working in APMPlanner 2. Thanks
Ultrafuge June 28, 2018 at 4:12am
Ultrafuge June 27, 2018 at 11:15pm

In MP check 'Use Time'.
Bruce June 27, 2018 at 9:46am

Thank you very much Andre. I will try implementing your suggestion.

Andre K. said:

for MATLAB/ python use mavlogdump.py to dump the log in a way that is easy to parse. (install mavproxy if you don't have it yet.)

For analysis/browsing the log, use the best tool; APMPlanner2.

Data Flash Log - Line Number to Seconds

Hi there, I was wondering if someone mind please explaining how to change the x-axis to have units of time (seconds,milliseconds, etc.) when graphing…
Andre K. June 25, 2018 at 1:23pm

for MATLAB/ python use mavlogdump.py to dump the log in a way that is easy to parse. (install mavproxy if you don't have it yet.)

For analysis/browsing the log, use the best tool; APMPlanner2.