SparkFun Forums

[btaillandier]

Hi !

I use the OLA during 24h and when I observed the log file from the SD card, I had empty data.
To illustrate, here my log file :


Do you have and idea what was going wrong ? Thank you
Bastien

[PaulZC]

Hi Bastien,
Have you upgraded your firmware to v1.6? (v1.5 had a problem where the IMU did not wake up correctly after sleep)
It would help if you can tell me what sensor data you are logging. Please share the "helper text" from menu option "h".
Best wishes,
Paul

[btaillandier]

I log essentially the IMU, but here are the output :

I use the v1.6, I modified it a few, I log at 5hz then, if the IMU stop moving since 5s, I log at 0.2Hz and the Artemis go to sleep mode between 2 logs

[PaulZC]

The IMU needed an extra 25ms when waking from sleep, before it would provide data. The critical line of code is here:
https://github.com/sparkfun/OpenLog_Art ... s.ino#L673
Please try increasing the delay from 25ms to perhaps 50ms.
Please let me know if that fixes the problem.
Best wishes,
Paul

[btaillandier]

Thank you for you answer, I test with 15 others OLA and I didn't see any problem.
When I retry with the first OLA, there was the same problem.

I just think that the first OLA was deteriorate.