PPK - long term logging?

[jumpingfool]

We have been using the Nordic PPK to optimise the power usage of our nRF52840 based application - very useful tool.

However, our application changes modes over time (e.g. changing BLE to higher connection interval when syncing data) and we would like to profile power usage over a few days of "real world" usage to determine average current and estimate likely battery life.

Is there a way to have the PPK log usage over extended periods? Ideally we would log the total (cumulative) current consumed at 1 minute intervals.

I see from another devzone ticket that there used to be a python script available to drive the PPK which would have opened the option to roll our own logging, but it seems this is no longer available?

Any advice gratefully received!

[Bjørn Kvaale]

The source code for the PPK app can be found here. I would recommend you to update the app to get logging to work over an extended period of time.

[wlgrd]

I just added a github repo with a python script that should help you get further.

https://github.com/chriswils/ppk_api

Just download the zip and run ´ python main.py´. 

There are some variables you might need to change:
´write_firmware´ to ´True´ if you dont have the official firmware running.
`measurement_time` to whatever time in seconds you need to run it for. 

Note that I haven't tested this for extended periods of time, since I just made it, so if there are some buffer errors when things starts to fill up, they are not covered. I would appreciate if you raise a pull request if you find anything that can improve the functionality :) 

For your use case though, you can have a script on the top of this, that runs this script (set at 60 seconds measurement time) over and over again, and accumulate the output over time. 

PS: The smu2450 is a Source Meter Unit that I use to manipulate different current draws with, so just ignore that.