Hi,
I'm using the STEVAL-STWINKT1B and the automode to log data, with the FPSNSDATALOG2 firmware. I'm reaching out because, although the logger seems to run for multiple hours, I only get a few minutes (or at best a couple of hours) of data saved on the SD card.
Here’s what I did:
I charged the dev kit's battery for about 7 hours. Before logging, the ST BLE Sensor app showed the battery level at 95%.
I formatted the SD card to FAT32 with a 32K allocation size.
I copied the following device_config.json to the root of the SD card:
nof_acquisition = 0
logging_period_s = 900 (15 minutes per file)
I started the logger by pressing PWR and RESET. The green LED blinked at 4Hz, indicating logging had started.
I monitored the logger as much as possible. After 8 hours, the green LED was still blinking, and the ST BLE Sensor app showed:
Alarm: Logging ongoing
Battery: 55%
(see screenshot below)
However, when I checked the SD card, I only found about 2.5 hours of data, specifically, 10 folders of 15 minutes each. But I expected at least 8 hours of logging.
So my question is: Why do I only get a few hours of logged data, even though the logger appears to be active (green LED blinking) for much longer?
Additional notes:
I repeated this test several times, and the result is always the same: much less data on the SD card than expected.
Here's the battery level over time during the abovementionned test:
0h: 95%
5h: 65%
5h15: 61%
6h: 60%
6h30: 58%
7h46: 55%
- I’m still using the SanDisk Extreme 256GB SD card (SDSQXAV-256G-GN6MA). I’m aware this is not one of the cards officially tested with the STEVAL-STWINKT1B, alas, I haven’t been able to get a different one yet.
Thanks in advance for your help!
Best regards,
Anthony
